1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Examples</title> 5<link rel="stylesheet" href="../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../index.html" title="Chapter 1. Boost.Contract 1.0.0"> 8<link rel="up" href="../index.html" title="Chapter 1. Boost.Contract 1.0.0"> 9<link rel="prev" href="extras.html" title="Extras"> 10<link rel="next" href="../reference.html" title="Reference"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="extras.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../reference.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h2 class="title" style="clear: both"> 27<a name="boost_contract.examples"></a><a class="link" href="examples.html" title="Examples">Examples</a> 28</h2></div></div></div> 29<div class="toc"><dl class="toc"> 30<dt><span class="section"><a href="examples.html#boost_contract.examples.__n1962___vector__contracts_for_stl_vector_and_comparison_with___n1962___proposed_syntax">[N1962] Vector: Contracts for STL 31 vector and comparison with [N1962] proposed 32 syntax</a></span></dt> 33<dt><span class="section"><a href="examples.html#boost_contract.examples.__n1962___circle__subcontracting">[N1962] 34 Circle: Subcontracting</a></span></dt> 35<dt><span class="section"><a href="examples.html#boost_contract.examples.__n1962___factorial__recursion">[N1962] 36 Factorial: Recursion</a></span></dt> 37<dt><span class="section"><a href="examples.html#boost_contract.examples.__n1962___equal__operators">[N1962] 38 Equal: Operators</a></span></dt> 39<dt><span class="section"><a href="examples.html#boost_contract.examples.__n1962___sum__array_parameter">[N1962] 40 Sum: Array parameter</a></span></dt> 41<dt><span class="section"><a href="examples.html#boost_contract.examples.__n1962___square_root__default_parameters_and_comparison_with_d_syntax">[N1962] 42 Square Root: Default parameters and comparison with D syntax</a></span></dt> 43<dt><span class="section"><a href="examples.html#boost_contract.examples.__meyer97___stack4__comparison_with_eiffel_syntax">[Meyer97] 44 Stack4: Comparison with Eiffel syntax</a></span></dt> 45<dt><span class="section"><a href="examples.html#boost_contract.examples.__meyer97___stack3__error_codes_instead_of_preconditions">[Meyer97] 46 Stack3: Error codes instead of preconditions</a></span></dt> 47<dt><span class="section"><a href="examples.html#boost_contract.examples.__mitchell02___name_list__relaxed_subcontracts">[Mitchell02] 48 Name List: Relaxed subcontracts</a></span></dt> 49<dt><span class="section"><a href="examples.html#boost_contract.examples.__mitchell02___dictionary__key_value_map">[Mitchell02] 50 Dictionary: Key-value map</a></span></dt> 51<dt><span class="section"><a href="examples.html#boost_contract.examples.__mitchell02___courier__subcontracting_and_static_class_invariants">[Mitchell02] 52 Courier: Subcontracting and static class invariants</a></span></dt> 53<dt><span class="section"><a href="examples.html#boost_contract.examples.__mitchell02___stack__stack_like_container">[Mitchell02] 54 Stack: Stack-like container</a></span></dt> 55<dt><span class="section"><a href="examples.html#boost_contract.examples.__mitchell02___simple_queue__queue_like_container_and_disable_old_value_copies_for_audit_assertions">[Mitchell02] 56 Simple Queue: Queue-like container and disable old value copies for audit assertions</a></span></dt> 57<dt><span class="section"><a href="examples.html#boost_contract.examples.__mitchell02___customer_manager__contracts_instead_of_defensive_programming">[Mitchell02] 58 Customer Manager: Contracts instead of defensive programming</a></span></dt> 59<dt><span class="section"><a href="examples.html#boost_contract.examples.__mitchell02___observer__pure_virtual_functions">[Mitchell02] 60 Observer: Pure virtual functions</a></span></dt> 61<dt><span class="section"><a href="examples.html#boost_contract.examples.__mitchell02___counter__subcontracting">[Mitchell02] 62 Counter: Subcontracting</a></span></dt> 63<dt><span class="section"><a href="examples.html#boost_contract.examples.__cline90___vector__comparison_with_a___proposal_syntax">[Cline90] 64 Vector: Comparison with A++ proposal syntax</a></span></dt> 65<dt><span class="section"><a href="examples.html#boost_contract.examples.__cline90___stack__stack_like_container">[Cline90] 66 Stack: Stack-like container</a></span></dt> 67<dt><span class="section"><a href="examples.html#boost_contract.examples.__cline90___vector_stack__subcontracting">[Cline90] 68 Vector-Stack: Subcontracting</a></span></dt> 69<dt><span class="section"><a href="examples.html#boost_contract.examples.__cline90___calendar__a_very_simple_calendar">[Cline90] 70 Calendar: A very simple calendar</a></span></dt> 71</dl></div> 72<p> 73 This section lists some examples taken from different sources discussing contract 74 programming and implemented here using this library. 75 </p> 76<div class="note"><table border="0" summary="Note"> 77<tr> 78<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../doc/src/images/note.png"></td> 79<th align="left">Note</th> 80</tr> 81<tr><td align="left" valign="top"><p> 82 Some of these examples might be from old code, containing obsolete coding 83 practices, not optimized for execution speed, not complete, and they might 84 be more relevant in the context of programming languages different from C++. 85 Nevertheless, programmers are encouraged to review these examples to see 86 a few diverse uses of this library that might be relevant to their needs. 87 </p></td></tr> 88</table></div> 89<p> 90 The examples in this sections are taken from the following sources: 91 </p> 92<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 93<li class="listitem"> 94 <a class="link" href="bibliography.html#N1962_anchor">[N1962]</a>: Examples from a detailed and 95 complete proposal to add contract programming to C++11 (unfortunately, 96 this proposal was never accepted into the standard). 97 </li> 98<li class="listitem"> 99 <a class="link" href="bibliography.html#Meyer97_anchor">[Meyer97]</a>: Examples from the Eiffel 100 programming language (reprogrammed here in C++ using this library). 101 </li> 102<li class="listitem"> 103 <a class="link" href="bibliography.html#Mitchell02_anchor">[Mitchell02]</a>: Additional examples 104 from the Eiffel programming language (reprogrammed here in C++ using this 105 library). 106 </li> 107<li class="listitem"> 108 <a class="link" href="bibliography.html#Cline90_anchor">[Cline90]</a>: Examples from a very early 109 proposal called Annotated C++ (A++) to add contract programming to C++ 110 (A++ was never implemented or proposed for addition to the standard). 111 </li> 112</ul></div> 113<p> 114 The following are some examples of particular interest: 115 </p> 116<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "> 117<li class="listitem"> 118 <a class="link" href="examples.html#N1962_vector_anchor">[N1962] Vector</a>: Complete set 119 of contracts for <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span></code>, plus a comparison with <a class="link" href="bibliography.html#N1962_anchor">[N1962]</a> syntax. 120 </li> 121<li class="listitem"> 122 <a class="link" href="examples.html#N1962_square_root_anchor">[N1962] Square Root</a>: Comparison 123 with D syntax. 124 </li> 125<li class="listitem"> 126 <a class="link" href="examples.html#Mitchell02_counter_anchor">[Mitchell02] Counter</a>: 127 Subcontracting. 128 </li> 129<li class="listitem"> 130 <a class="link" href="examples.html#Meyer97_stack4_anchor">[Meyer97] Stack4</a>: Comparison 131 with Eiffel syntax. 132 </li> 133<li class="listitem"> 134 <a class="link" href="examples.html#Cline90_vector_anchor">[Cline90] Vector</a>: Comparison 135 with A++ syntax. 136 </li> 137</ul></div> 138<p> 139 Most of the examples listed here use old values and class invariants which 140 are instead not supported by <a class="link" href="bibliography.html#P0380_anchor">[P0380]</a>. Therefore, 141 there is not meaningful example here that can be directly implemented and compared 142 using <a class="link" href="bibliography.html#P0380_anchor">[P0380]</a> syntax. 143 </p> 144<div class="section"> 145<div class="titlepage"><div><div><h3 class="title"> 146<a name="boost_contract.examples.__n1962___vector__contracts_for_stl_vector_and_comparison_with___n1962___proposed_syntax"></a><a name="N1962_vector_anchor"></a>[N1962] Vector: Contracts for STL 147 vector and comparison with <a class="link" href="bibliography.html#N1962_anchor">[N1962]</a> proposed 148 syntax</h3></div></div></div> 149<p> 150 On compilers that support C++17 <code class="computeroutput"><span class="keyword">if</span> 151 <span class="keyword">constexpr</span></code>, the following example using 152 this library can be simplified removing <code class="computeroutput"><a class="link" href="../boost/contract/condition_if.html" title="Function template condition_if">boost::contract::condition_if</a></code> 153 and related functor templates such as <code class="computeroutput"><span class="identifier">all_of_equal_to</span></code>, 154 etc., making it more similar to the pseudo-code on the right-hand side (see 155 <a class="link" href="extras.html#boost_contract.extras.assertion_requirements__templates_" title="Assertion Requirements (Templates)">Assertion 156 Requirements</a>). 157 </p> 158<div class="informaltable"><table class="table"> 159<colgroup> 160<col> 161<col> 162</colgroup> 163<thead><tr> 164<th> 165 <p> 166 This library 167 </p> 168 </th> 169<th> 170 <p> 171 [N1962] proposal (not accepted in C++) plus C++17 <code class="literal">if constexpr</code> 172 </p> 173 </th> 174</tr></thead> 175<tbody><tr> 176<td> 177 <p> 178</p> 179<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 180<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">bind</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 181<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">optional</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 182<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">cxx11</span><span class="special">/</span><span class="identifier">all_of</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 183<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">has_equal_to</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 184<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">next_prior</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 185<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">vector</span><span class="special">></span> 186<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">functional</span><span class="special">></span> 187<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iterator</span><span class="special">></span> 188<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">memory</span><span class="special">></span> 189<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 190 191<span class="comment">// Could be programmed at call site with C++14 generic lambdas.</span> 192<span class="keyword">struct</span> <span class="identifier">all_of_equal_to</span> <span class="special">{</span> 193 <span class="keyword">typedef</span> <span class="keyword">bool</span> <span class="identifier">result_type</span><span class="special">;</span> 194 195 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">InputIter</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 196 <span class="identifier">result_type</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">InputIter</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">InputIter</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 197 <span class="keyword">return</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">algorithm</span><span class="special">::</span><span class="identifier">all_of_equal</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">value</span><span class="special">);</span> 198 <span class="special">}</span> 199 200 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">InputIter</span><span class="special">></span> 201 <span class="identifier">result_type</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">InputIter</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">InputIter</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">InputIter</span> <span class="identifier">where</span><span class="special">)</span> <span class="special">{</span> 202 <span class="keyword">for</span><span class="special">(</span><span class="identifier">InputIter</span> <span class="identifier">i</span> <span class="special">=</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">j</span> <span class="special">=</span> <span class="identifier">where</span><span class="special">;</span> <span class="identifier">i</span> <span class="special">!=</span> <span class="identifier">last</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">,</span> <span class="special">++</span><span class="identifier">j</span><span class="special">)</span> <span class="special">{</span> 203 <span class="keyword">if</span><span class="special">(*</span><span class="identifier">i</span> <span class="special">!=</span> <span class="special">*</span><span class="identifier">j</span><span class="special">)</span> <span class="keyword">return</span> <span class="keyword">false</span><span class="special">;</span> 204 <span class="special">}</span> 205 <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span> 206 <span class="special">}</span> 207<span class="special">};</span> 208 209<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Iter</span><span class="special">></span> 210<span class="keyword">bool</span> <span class="identifier">valid</span><span class="special">(</span><span class="identifier">Iter</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">Iter</span> <span class="identifier">last</span><span class="special">);</span> <span class="comment">// Cannot implement in C++ (for axiom only).</span> 211 212<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Iter</span><span class="special">></span> 213<span class="keyword">bool</span> <span class="identifier">contained</span><span class="special">(</span><span class="identifier">Iter</span> <span class="identifier">first1</span><span class="special">,</span> <span class="identifier">Iter</span> <span class="identifier">last1</span><span class="special">,</span> <span class="identifier">Iter</span> <span class="identifier">first2</span><span class="special">,</span> <span class="identifier">Iter</span> <span class="identifier">last2</span><span class="special">);</span> <span class="comment">// For axiom.</span> 214 215<span class="comment">// STL vector requires T copyable but not equality comparable.</span> 216<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Allocator</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">></span> 217<span class="keyword">class</span> <span class="identifier">vector</span> <span class="special">{</span> 218 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 219 220 <span class="keyword">void</span> <span class="identifier">invariant</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 221 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">empty</span><span class="special">()</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">));</span> 222 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">end</span><span class="special">())</span> <span class="special">==</span> <span class="keyword">int</span><span class="special">(</span><span class="identifier">size</span><span class="special">()));</span> 223 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">rbegin</span><span class="special">(),</span> <span class="identifier">rend</span><span class="special">())</span> <span class="special">==</span> <span class="keyword">int</span><span class="special">(</span><span class="identifier">size</span><span class="special">()));</span> 224 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special"><=</span> <span class="identifier">capacity</span><span class="special">());</span> 225 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special"><=</span> <span class="identifier">max_size</span><span class="special">());</span> 226 <span class="special">}</span> 227 228<span class="keyword">public</span><span class="special">:</span> 229 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">allocator_type</span> <span class="identifier">allocator_type</span><span class="special">;</span> 230 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">pointer</span> <span class="identifier">pointer</span><span class="special">;</span> 231 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">const_pointer</span> <span class="identifier">const_pointer</span><span class="special">;</span> 232 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">reference</span> <span class="identifier">reference</span><span class="special">;</span> 233 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">const_reference</span> <span class="identifier">const_reference</span><span class="special">;</span> 234 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">value_type</span> <span class="identifier">value_type</span><span class="special">;</span> 235 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">iterator</span> <span class="identifier">iterator</span><span class="special">;</span> 236 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">const_iterator</span> <span class="identifier">const_iterator</span><span class="special">;</span> 237 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">size_type</span> <span class="identifier">size_type</span><span class="special">;</span> 238 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">difference_type</span> <span class="identifier">difference_type</span><span class="special">;</span> 239 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">reverse_iterator</span> 240 <span class="identifier">reverse_iterator</span><span class="special">;</span> 241 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">const_reverse_iterator</span> 242 <span class="identifier">const_reverse_iterator</span><span class="special">;</span> 243 244 <span class="identifier">vector</span><span class="special">()</span> <span class="special">:</span> <span class="identifier">vect_</span><span class="special">()</span> <span class="special">{</span> 245 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 246 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 247 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">empty</span><span class="special">());</span> 248 <span class="special">})</span> 249 <span class="special">;</span> 250 <span class="special">}</span> 251 252 <span class="keyword">explicit</span> <span class="identifier">vector</span><span class="special">(</span><span class="identifier">Allocator</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">alloc</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">vect_</span><span class="special">(</span><span class="identifier">alloc</span><span class="special">)</span> <span class="special">{</span> 253 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 254 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 255 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">empty</span><span class="special">());</span> 256 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">get_allocator</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">alloc</span><span class="special">);</span> 257 <span class="special">})</span> 258 <span class="special">;</span> 259 <span class="special">}</span> 260 261 <span class="keyword">explicit</span> <span class="identifier">vector</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">count</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">vect_</span><span class="special">(</span><span class="identifier">count</span><span class="special">)</span> <span class="special">{</span> 262 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 263 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 264 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">count</span><span class="special">);</span> 265 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span> 266 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">condition_if</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(</span> 267 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">all_of_equal_to</span><span class="special">(),</span> <span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">end</span><span class="special">(),</span> <span class="identifier">T</span><span class="special">())</span> 268 <span class="special">)</span> 269 <span class="special">);</span> 270 <span class="special">})</span> 271 <span class="special">;</span> 272 <span class="special">}</span> 273 274 <span class="identifier">vector</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">count</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">vect_</span><span class="special">(</span><span class="identifier">count</span><span class="special">,</span> <span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 275 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 276 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 277 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">count</span><span class="special">);</span> 278 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span> 279 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">condition_if</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(</span> 280 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">all_of_equal_to</span><span class="special">(),</span> <span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">end</span><span class="special">(),</span> 281 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(</span><span class="identifier">value</span><span class="special">))</span> 282 <span class="special">)</span> 283 <span class="special">);</span> 284 <span class="special">})</span> 285 <span class="special">;</span> 286 <span class="special">}</span> 287 288 <span class="identifier">vector</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">count</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">,</span> <span class="identifier">Allocator</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">alloc</span><span class="special">)</span> <span class="special">:</span> 289 <span class="identifier">vect_</span><span class="special">(</span><span class="identifier">count</span><span class="special">,</span> <span class="identifier">value</span><span class="special">,</span> <span class="identifier">alloc</span><span class="special">)</span> <span class="special">{</span> 290 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 291 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 292 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">count</span><span class="special">);</span> 293 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span> 294 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">condition_if</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(</span> 295 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">all_of_equal_to</span><span class="special">(),</span> <span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">end</span><span class="special">(),</span> 296 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(</span><span class="identifier">value</span><span class="special">))</span> 297 <span class="special">)</span> 298 <span class="special">);</span> 299 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">get_allocator</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">alloc</span><span class="special">);</span> 300 <span class="special">})</span> 301 <span class="special">;</span> 302 <span class="special">}</span> 303 304 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">InputIter</span><span class="special">></span> 305 <span class="identifier">vector</span><span class="special">(</span><span class="identifier">InputIter</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">InputIter</span> <span class="identifier">last</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">vect_</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">)</span> <span class="special">{</span> 306 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 307 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 308 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">)</span> <span class="special">==</span> 309 <span class="keyword">int</span><span class="special">(</span><span class="identifier">size</span><span class="special">()));</span> 310 <span class="special">})</span> 311 <span class="special">;</span> 312 <span class="special">}</span> 313 314 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">InputIter</span><span class="special">></span> 315 <span class="identifier">vector</span><span class="special">(</span><span class="identifier">InputIter</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">InputIter</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">Allocator</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">alloc</span><span class="special">)</span> <span class="special">:</span> 316 <span class="identifier">vect_</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">alloc</span><span class="special">)</span> <span class="special">{</span> 317 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 318 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 319 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">)</span> <span class="special">==</span> 320 <span class="keyword">int</span><span class="special">(</span><span class="identifier">size</span><span class="special">()));</span> 321 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">get_allocator</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">alloc</span><span class="special">);</span> 322 <span class="special">})</span> 323 <span class="special">;</span> 324 <span class="special">}</span> 325 326 <span class="comment">/* implicit */</span> <span class="identifier">vector</span><span class="special">(</span><span class="identifier">vector</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">vect_</span><span class="special">(</span><span class="identifier">other</span><span class="special">.</span><span class="identifier">vect_</span><span class="special">)</span> <span class="special">{</span> 327 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 328 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 329 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span> 330 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">condition_if</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(</span> 331 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">equal_to</span><span class="special"><</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(),</span> 332 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(*</span><span class="keyword">this</span><span class="special">),</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(</span><span class="identifier">other</span><span class="special">))</span> 333 <span class="special">)</span> 334 <span class="special">);</span> 335 <span class="special">})</span> 336 <span class="special">;</span> 337 <span class="special">}</span> 338 339 <span class="identifier">vector</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">=(</span><span class="identifier">vector</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="special">{</span> 340 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special"><</span><span class="identifier">vector</span><span class="special">&></span> <span class="identifier">result</span><span class="special">;</span> 341 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 342 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 343 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span> 344 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">condition_if</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(</span> 345 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">equal_to</span><span class="special"><</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(),</span> 346 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(*</span><span class="keyword">this</span><span class="special">),</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(</span><span class="identifier">other</span><span class="special">))</span> 347 <span class="special">)</span> 348 <span class="special">);</span> 349 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span> 350 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">condition_if</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(</span> 351 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">equal_to</span><span class="special"><</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(),</span> 352 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(*</span><span class="identifier">result</span><span class="special">),</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(*</span><span class="keyword">this</span><span class="special">))</span> 353 <span class="special">)</span> 354 <span class="special">);</span> 355 <span class="special">})</span> 356 <span class="special">;</span> 357 358 <span class="keyword">if</span><span class="special">(</span><span class="keyword">this</span> <span class="special">!=</span> <span class="special">&</span><span class="identifier">other</span><span class="special">)</span> <span class="identifier">vect_</span> <span class="special">=</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">vect_</span><span class="special">;</span> 359 <span class="keyword">return</span> <span class="special">*(</span><span class="identifier">result</span> <span class="special">=</span> <span class="special">*</span><span class="keyword">this</span><span class="special">);</span> 360 <span class="special">}</span> 361 362 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">vector</span><span class="special">()</span> <span class="special">{</span> 363 <span class="comment">// Check invariants.</span> 364 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 365 <span class="special">}</span> 366 367 <span class="keyword">void</span> <span class="identifier">reserve</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">count</span><span class="special">)</span> <span class="special">{</span> 368 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 369 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 370 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span> <span class="special"><</span> <span class="identifier">max_size</span><span class="special">());</span> 371 <span class="special">})</span> 372 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 373 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">>=</span> <span class="identifier">count</span><span class="special">);</span> 374 <span class="special">})</span> 375 <span class="special">;</span> 376 377 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">reserve</span><span class="special">(</span><span class="identifier">count</span><span class="special">);</span> 378 <span class="special">}</span> 379 380 <span class="identifier">size_type</span> <span class="identifier">capacity</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 381 <span class="identifier">size_type</span> <span class="identifier">result</span><span class="special">;</span> 382 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 383 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 384 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">>=</span> <span class="identifier">size</span><span class="special">());</span> 385 <span class="special">})</span> 386 <span class="special">;</span> 387 388 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">();</span> 389 <span class="special">}</span> 390 391 <span class="identifier">iterator</span> <span class="identifier">begin</span><span class="special">()</span> <span class="special">{</span> 392 <span class="identifier">iterator</span> <span class="identifier">result</span><span class="special">;</span> 393 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 394 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 395 <span class="keyword">if</span><span class="special">(</span><span class="identifier">empty</span><span class="special">())</span> <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">==</span> <span class="identifier">end</span><span class="special">());</span> 396 <span class="special">})</span> 397 <span class="special">;</span> 398 399 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> 400 <span class="special">}</span> 401 402 <span class="identifier">const_iterator</span> <span class="identifier">begin</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 403 <span class="identifier">const_iterator</span> <span class="identifier">result</span><span class="special">;</span> 404 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 405 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 406 <span class="keyword">if</span><span class="special">(</span><span class="identifier">empty</span><span class="special">())</span> <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">==</span> <span class="identifier">end</span><span class="special">());</span> 407 <span class="special">})</span> 408 <span class="special">;</span> 409 410 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> 411 <span class="special">}</span> 412 413 <span class="identifier">iterator</span> <span class="identifier">end</span><span class="special">()</span> <span class="special">{</span> 414 <span class="comment">// Check invariants.</span> 415 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 416 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span> 417 <span class="special">}</span> 418 419 <span class="identifier">const_iterator</span> <span class="identifier">end</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 420 <span class="comment">// Check invariants.</span> 421 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 422 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span> 423 <span class="special">}</span> 424 425 <span class="identifier">reverse_iterator</span> <span class="identifier">rbegin</span><span class="special">()</span> <span class="special">{</span> 426 <span class="identifier">iterator</span> <span class="identifier">result</span><span class="special">;</span> 427 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 428 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 429 <span class="keyword">if</span><span class="special">(</span><span class="identifier">empty</span><span class="special">())</span> <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">==</span> <span class="identifier">rend</span><span class="special">());</span> 430 <span class="special">})</span> 431 <span class="special">;</span> 432 433 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">rbegin</span><span class="special">();</span> 434 <span class="special">}</span> 435 436 <span class="identifier">const_reverse_iterator</span> <span class="identifier">rbegin</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 437 <span class="identifier">const_reverse_iterator</span> <span class="identifier">result</span><span class="special">;</span> 438 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 439 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 440 <span class="keyword">if</span><span class="special">(</span><span class="identifier">empty</span><span class="special">())</span> <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">==</span> <span class="identifier">rend</span><span class="special">());</span> 441 <span class="special">})</span> 442 <span class="special">;</span> 443 444 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">rbegin</span><span class="special">();</span> 445 <span class="special">}</span> 446 447 <span class="identifier">reverse_iterator</span> <span class="identifier">rend</span><span class="special">()</span> <span class="special">{</span> 448 <span class="comment">// Check invariants.</span> 449 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 450 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">rend</span><span class="special">();</span> 451 <span class="special">}</span> 452 453 <span class="identifier">const_reverse_iterator</span> <span class="identifier">rend</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 454 <span class="comment">// Check invariants.</span> 455 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 456 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">rend</span><span class="special">();</span> 457 <span class="special">}</span> 458 459 <span class="keyword">void</span> <span class="identifier">resize</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">count</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">())</span> <span class="special">{</span> 460 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">size_type</span><span class="special">></span> <span class="identifier">old_size</span> <span class="special">=</span> 461 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">size</span><span class="special">());</span> 462 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 463 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 464 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">count</span><span class="special">);</span> 465 <span class="keyword">if</span><span class="special">(</span><span class="identifier">count</span> <span class="special">></span> <span class="special">*</span><span class="identifier">old_size</span><span class="special">)</span> <span class="special">{</span> 466 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span> 467 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">condition_if</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(</span> 468 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">all_of_equal_to</span><span class="special">(),</span> <span class="identifier">begin</span><span class="special">()</span> <span class="special">+</span> <span class="special">*</span><span class="identifier">old_size</span><span class="special">,</span> 469 <span class="identifier">end</span><span class="special">(),</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(</span><span class="identifier">value</span><span class="special">))</span> 470 <span class="special">)</span> 471 <span class="special">);</span> 472 <span class="special">}</span> 473 <span class="special">})</span> 474 <span class="special">;</span> 475 476 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">resize</span><span class="special">(</span><span class="identifier">count</span><span class="special">,</span> <span class="identifier">value</span><span class="special">);</span> 477 <span class="special">}</span> 478 479 <span class="identifier">size_type</span> <span class="identifier">size</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 480 <span class="identifier">size_type</span> <span class="identifier">result</span><span class="special">;</span> 481 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 482 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 483 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special"><=</span> <span class="identifier">capacity</span><span class="special">());</span> 484 <span class="special">})</span> 485 <span class="special">;</span> 486 487 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">size</span><span class="special">();</span> 488 <span class="special">}</span> 489 490 <span class="identifier">size_type</span> <span class="identifier">max_size</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 491 <span class="identifier">size_type</span> <span class="identifier">result</span><span class="special">;</span> 492 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 493 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 494 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">>=</span> <span class="identifier">capacity</span><span class="special">());</span> 495 <span class="special">})</span> 496 <span class="special">;</span> 497 498 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">max_size</span><span class="special">();</span> 499 <span class="special">}</span> 500 501 <span class="keyword">bool</span> <span class="identifier">empty</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 502 <span class="keyword">bool</span> <span class="identifier">result</span><span class="special">;</span> 503 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 504 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 505 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">));</span> 506 <span class="special">})</span> 507 <span class="special">;</span> 508 509 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">empty</span><span class="special">();</span> 510 <span class="special">}</span> 511 512 <span class="identifier">Allocator</span> <span class="identifier">get_allocator</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 513 <span class="comment">// Check invariants.</span> 514 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 515 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">get_allocator</span><span class="special">();</span> 516 <span class="special">}</span> 517 518 <span class="identifier">reference</span> <span class="identifier">at</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">index</span><span class="special">)</span> <span class="special">{</span> 519 <span class="comment">// Check invariants, no pre (throw out_of_range for invalid index).</span> 520 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 521 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">at</span><span class="special">(</span><span class="identifier">index</span><span class="special">);</span> 522 <span class="special">}</span> 523 524 <span class="identifier">const_reference</span> <span class="identifier">at</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">index</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> 525 <span class="comment">// Check invariants, no pre (throw out_of_range for invalid index).</span> 526 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 527 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">at</span><span class="special">(</span><span class="identifier">index</span><span class="special">);</span> 528 <span class="special">}</span> 529 530 <span class="identifier">reference</span> <span class="keyword">operator</span><span class="special">[](</span><span class="identifier">size_type</span> <span class="identifier">index</span><span class="special">)</span> <span class="special">{</span> 531 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 532 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 533 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">index</span> <span class="special"><</span> <span class="identifier">size</span><span class="special">());</span> 534 <span class="special">})</span> 535 <span class="special">;</span> 536 537 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">[</span><span class="identifier">index</span><span class="special">];</span> 538 <span class="special">}</span> 539 540 <span class="identifier">const_reference</span> <span class="keyword">operator</span><span class="special">[](</span><span class="identifier">size_type</span> <span class="identifier">index</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> 541 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 542 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 543 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">index</span> <span class="special"><</span> <span class="identifier">size</span><span class="special">());</span> 544 <span class="special">})</span> 545 <span class="special">;</span> 546 547 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">[</span><span class="identifier">index</span><span class="special">];</span> 548 <span class="special">}</span> 549 550 <span class="identifier">reference</span> <span class="identifier">front</span><span class="special">()</span> <span class="special">{</span> 551 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 552 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 553 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">());</span> 554 <span class="special">})</span> 555 <span class="special">;</span> 556 557 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">front</span><span class="special">();</span> 558 <span class="special">}</span> 559 560 <span class="identifier">const_reference</span> <span class="identifier">front</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 561 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 562 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 563 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">());</span> 564 <span class="special">})</span> 565 <span class="special">;</span> 566 567 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">front</span><span class="special">();</span> 568 <span class="special">}</span> 569 570 <span class="identifier">reference</span> <span class="identifier">back</span><span class="special">()</span> <span class="special">{</span> 571 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 572 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 573 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">());</span> 574 <span class="special">})</span> 575 <span class="special">;</span> 576 577 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">back</span><span class="special">();</span> 578 <span class="special">}</span> 579 580 <span class="identifier">const_reference</span> <span class="identifier">back</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 581 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 582 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 583 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">());</span> 584 <span class="special">})</span> 585 <span class="special">;</span> 586 587 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">back</span><span class="special">();</span> 588 <span class="special">}</span> 589 590 <span class="keyword">void</span> <span class="identifier">push_back</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 591 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">size_type</span><span class="special">></span> <span class="identifier">old_size</span> <span class="special">=</span> 592 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">size</span><span class="special">());</span> 593 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">size_type</span><span class="special">></span> <span class="identifier">old_capacity</span> <span class="special">=</span> 594 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">());</span> 595 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 596 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 597 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special"><</span> <span class="identifier">max_size</span><span class="special">());</span> 598 <span class="special">})</span> 599 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 600 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_size</span> <span class="special">+</span> <span class="number">1</span><span class="special">);</span> 601 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">>=</span> <span class="special">*</span><span class="identifier">old_capacity</span><span class="special">);</span> 602 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span> 603 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">condition_if</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(</span> 604 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">>(),</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(</span><span class="identifier">back</span><span class="special">()),</span> 605 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(</span><span class="identifier">value</span><span class="special">))</span> 606 <span class="special">)</span> 607 <span class="special">);</span> 608 <span class="special">})</span> 609 <span class="special">;</span> 610 611 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">value</span><span class="special">);</span> 612 <span class="special">}</span> 613 614 <span class="keyword">void</span> <span class="identifier">pop_back</span><span class="special">()</span> <span class="special">{</span> 615 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">size_type</span><span class="special">></span> <span class="identifier">old_size</span> <span class="special">=</span> 616 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">size</span><span class="special">());</span> 617 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 618 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 619 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">());</span> 620 <span class="special">})</span> 621 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 622 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_size</span> <span class="special">-</span> <span class="number">1</span><span class="special">);</span> 623 <span class="special">})</span> 624 <span class="special">;</span> 625 626 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">pop_back</span><span class="special">();</span> 627 <span class="special">}</span> 628 629 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">InputIter</span><span class="special">></span> 630 <span class="keyword">void</span> <span class="identifier">assign</span><span class="special">(</span><span class="identifier">InputIter</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">InputIter</span> <span class="identifier">last</span><span class="special">)</span> <span class="special">{</span> 631 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 632 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 633 <span class="identifier">BOOST_CONTRACT_ASSERT_AXIOM</span><span class="special">(</span> 634 <span class="special">!</span><span class="identifier">contained</span><span class="special">(</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">end</span><span class="special">(),</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">));</span> 635 <span class="special">})</span> 636 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 637 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">)</span> <span class="special">==</span> 638 <span class="keyword">int</span><span class="special">(</span><span class="identifier">size</span><span class="special">()));</span> 639 <span class="special">})</span> 640 <span class="special">;</span> 641 642 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">assign</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">);</span> 643 <span class="special">}</span> 644 645 <span class="keyword">void</span> <span class="identifier">assign</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">count</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 646 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 647 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 648 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span> <span class="special"><=</span> <span class="identifier">max_size</span><span class="special">());</span> 649 <span class="special">})</span> 650 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 651 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span> 652 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">condition_if</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(</span> 653 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">all_of_equal_to</span><span class="special">(),</span> <span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">end</span><span class="special">(),</span> 654 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(</span><span class="identifier">value</span><span class="special">))</span> 655 <span class="special">)</span> 656 <span class="special">);</span> 657 <span class="special">})</span> 658 <span class="special">;</span> 659 660 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">assign</span><span class="special">(</span><span class="identifier">count</span><span class="special">,</span> <span class="identifier">value</span><span class="special">);</span> 661 <span class="special">}</span> 662 663 <span class="identifier">iterator</span> <span class="identifier">insert</span><span class="special">(</span><span class="identifier">iterator</span> <span class="identifier">where</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 664 <span class="identifier">iterator</span> <span class="identifier">result</span><span class="special">;</span> 665 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">size_type</span><span class="special">></span> <span class="identifier">old_size</span> <span class="special">=</span> 666 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">size</span><span class="special">());</span> 667 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">size_type</span><span class="special">></span> <span class="identifier">old_capacity</span> <span class="special">=</span> 668 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">());</span> 669 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 670 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 671 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special"><</span> <span class="identifier">max_size</span><span class="special">());</span> 672 <span class="special">})</span> 673 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 674 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_size</span> <span class="special">+</span> <span class="number">1</span><span class="special">);</span> 675 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">>=</span> <span class="special">*</span><span class="identifier">old_capacity</span><span class="special">);</span> 676 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span> 677 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">condition_if</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(</span> 678 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">>(),</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(*</span><span class="identifier">result</span><span class="special">),</span> 679 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(</span><span class="identifier">value</span><span class="special">))</span> 680 <span class="special">)</span> 681 <span class="special">);</span> 682 <span class="keyword">if</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">></span> <span class="special">*</span><span class="identifier">old_capacity</span><span class="special">)</span> <span class="special">{</span> 683 <span class="identifier">BOOST_CONTRACT_ASSERT_AXIOM</span><span class="special">(!</span><span class="identifier">valid</span><span class="special">(</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">end</span><span class="special">()));</span> 684 <span class="special">}</span> <span class="keyword">else</span> <span class="special">{</span> 685 <span class="identifier">BOOST_CONTRACT_ASSERT_AXIOM</span><span class="special">(!</span><span class="identifier">valid</span><span class="special">(</span><span class="identifier">where</span><span class="special">,</span> <span class="identifier">end</span><span class="special">()));</span> 686 <span class="special">}</span> 687 <span class="special">})</span> 688 <span class="special">;</span> 689 690 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">where</span><span class="special">,</span> <span class="identifier">value</span><span class="special">);</span> 691 <span class="special">}</span> 692 693 <span class="keyword">void</span> <span class="identifier">insert</span><span class="special">(</span><span class="identifier">iterator</span> <span class="identifier">where</span><span class="special">,</span> <span class="identifier">size_type</span> <span class="identifier">count</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 694 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">size_type</span><span class="special">></span> <span class="identifier">old_size</span> <span class="special">=</span> 695 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">size</span><span class="special">());</span> 696 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">size_type</span><span class="special">></span> <span class="identifier">old_capacity</span> <span class="special">=</span> 697 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">());</span> 698 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">iterator</span><span class="special">></span> <span class="identifier">old_where</span> <span class="special">=</span> 699 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">where</span><span class="special">);</span> 700 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 701 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 702 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">count</span> <span class="special"><</span> <span class="identifier">max_size</span><span class="special">());</span> 703 <span class="special">})</span> 704 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 705 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_size</span> <span class="special">+</span> <span class="identifier">count</span><span class="special">);</span> 706 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">>=</span> <span class="special">*</span><span class="identifier">old_capacity</span><span class="special">);</span> 707 <span class="keyword">if</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_capacity</span><span class="special">)</span> <span class="special">{</span> 708 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span> 709 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">condition_if</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(</span> 710 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">all_of_equal_to</span><span class="special">(),</span> 711 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">prior</span><span class="special">(*</span><span class="identifier">old_where</span><span class="special">),</span> 712 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">prior</span><span class="special">(*</span><span class="identifier">old_where</span><span class="special">)</span> <span class="special">+</span> <span class="identifier">count</span><span class="special">,</span> 713 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(</span><span class="identifier">value</span><span class="special">)</span> 714 <span class="special">)</span> 715 <span class="special">)</span> 716 <span class="special">);</span> 717 <span class="identifier">BOOST_CONTRACT_ASSERT_AXIOM</span><span class="special">(!</span><span class="identifier">valid</span><span class="special">(</span><span class="identifier">where</span><span class="special">,</span> <span class="identifier">end</span><span class="special">()));</span> 718 <span class="special">}</span> <span class="keyword">else</span> <span class="identifier">BOOST_CONTRACT_ASSERT_AXIOM</span><span class="special">(!</span><span class="identifier">valid</span><span class="special">(</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">end</span><span class="special">()));</span> 719 <span class="special">})</span> 720 <span class="special">;</span> 721 722 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">where</span><span class="special">,</span> <span class="identifier">count</span><span class="special">,</span> <span class="identifier">value</span><span class="special">);</span> 723 <span class="special">}</span> 724 725 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">InputIter</span><span class="special">></span> 726 <span class="keyword">void</span> <span class="identifier">insert</span><span class="special">(</span><span class="identifier">iterator</span> <span class="identifier">where</span><span class="special">,</span> <span class="identifier">InputIter</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">InputIter</span> <span class="identifier">last</span><span class="special">)</span> <span class="special">{</span> 727 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">size_type</span><span class="special">></span> <span class="identifier">old_size</span> <span class="special">=</span> 728 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">size</span><span class="special">());</span> 729 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">size_type</span><span class="special">></span> <span class="identifier">old_capacity</span> <span class="special">=</span> 730 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">());</span> 731 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">iterator</span><span class="special">></span> <span class="identifier">old_where</span> <span class="special">=</span> 732 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">where</span><span class="special">);</span> 733 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 734 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 735 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">)</span> <span class="special"><</span> 736 <span class="identifier">max_size</span><span class="special">());</span> 737 <span class="identifier">BOOST_CONTRACT_ASSERT_AXIOM</span><span class="special">(</span> 738 <span class="special">!</span><span class="identifier">contained</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">end</span><span class="special">()));</span> 739 <span class="special">})</span> 740 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 741 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_size</span><span class="special">()</span> <span class="special">+</span> 742 <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">));</span> 743 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">>=</span> <span class="special">*</span><span class="identifier">old_capacity</span><span class="special">);</span> 744 <span class="keyword">if</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_capacity</span><span class="special">)</span> <span class="special">{</span> 745 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span> 746 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">condition_if</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(</span> 747 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">all_of_equal_to</span><span class="special">(),</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">,</span> 748 <span class="special">*</span><span class="identifier">old_where</span><span class="special">)</span> 749 <span class="special">)</span> 750 <span class="special">);</span> 751 <span class="identifier">BOOST_CONTRACT_ASSERT_AXIOM</span><span class="special">(!</span><span class="identifier">valid</span><span class="special">(</span><span class="identifier">where</span><span class="special">,</span> <span class="identifier">end</span><span class="special">()));</span> 752 <span class="special">}</span> <span class="keyword">else</span> <span class="identifier">BOOST_CONTRACT_ASSERT_AXIOM</span><span class="special">(!</span><span class="identifier">valid</span><span class="special">(</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">end</span><span class="special">()));</span> 753 <span class="special">})</span> 754 <span class="special">;</span> 755 756 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">where</span><span class="special">,</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">);</span> 757 <span class="special">}</span> 758 759 <span class="identifier">iterator</span> <span class="identifier">erase</span><span class="special">(</span><span class="identifier">iterator</span> <span class="identifier">where</span><span class="special">)</span> <span class="special">{</span> 760 <span class="identifier">iterator</span> <span class="identifier">result</span><span class="special">;</span> 761 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">size_type</span><span class="special">></span> <span class="identifier">old_size</span> <span class="special">=</span> 762 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">size</span><span class="special">());</span> 763 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 764 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 765 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">());</span> 766 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">where</span> <span class="special">!=</span> <span class="identifier">end</span><span class="special">());</span> 767 <span class="special">})</span> 768 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 769 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_size</span> <span class="special">-</span> <span class="number">1</span><span class="special">);</span> 770 <span class="keyword">if</span><span class="special">(</span><span class="identifier">empty</span><span class="special">())</span> <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">==</span> <span class="identifier">end</span><span class="special">());</span> 771 <span class="identifier">BOOST_CONTRACT_ASSERT_AXIOM</span><span class="special">(!</span><span class="identifier">valid</span><span class="special">(</span><span class="identifier">where</span><span class="special">,</span> <span class="identifier">end</span><span class="special">()));</span> 772 <span class="special">})</span> 773 <span class="special">;</span> 774 775 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">erase</span><span class="special">(</span><span class="identifier">where</span><span class="special">);</span> 776 <span class="special">}</span> 777 778 <span class="identifier">iterator</span> <span class="identifier">erase</span><span class="special">(</span><span class="identifier">iterator</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">iterator</span> <span class="identifier">last</span><span class="special">)</span> <span class="special">{</span> 779 <span class="identifier">iterator</span> <span class="identifier">result</span><span class="special">;</span> 780 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">size_type</span><span class="special">></span> <span class="identifier">old_size</span> <span class="special">=</span> 781 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">size</span><span class="special">());</span> 782 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 783 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 784 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">>=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">));</span> 785 <span class="special">})</span> 786 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 787 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_size</span> <span class="special">-</span> 788 <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">));</span> 789 <span class="keyword">if</span><span class="special">(</span><span class="identifier">empty</span><span class="special">())</span> <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">==</span> <span class="identifier">end</span><span class="special">());</span> 790 <span class="identifier">BOOST_CONTRACT_ASSERT_AXIOM</span><span class="special">(!</span><span class="identifier">valid</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">));</span> 791 <span class="special">})</span> 792 <span class="special">;</span> 793 794 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">erase</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">);</span> 795 <span class="special">}</span> 796 797 <span class="keyword">void</span> <span class="identifier">clear</span><span class="special">()</span> <span class="special">{</span> 798 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 799 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 800 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">empty</span><span class="special">());</span> 801 <span class="special">})</span> 802 <span class="special">;</span> 803 804 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">clear</span><span class="special">();</span> 805 <span class="special">}</span> 806 807 <span class="keyword">void</span> <span class="identifier">swap</span><span class="special">(</span><span class="identifier">vector</span><span class="special">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="special">{</span> 808 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">vector</span><span class="special">></span> <span class="identifier">old_me</span><span class="special">,</span> <span class="identifier">old_other</span><span class="special">;</span> 809 <span class="preprocessor">#ifdef</span> <span class="identifier">BOOST_CONTRACT_AUDITS</span> 810 <span class="identifier">old_me</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(*</span><span class="keyword">this</span><span class="special">);</span> 811 <span class="identifier">old_other</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">other</span><span class="special">);</span> 812 <span class="preprocessor">#endif</span> 813 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 814 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 815 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">get_allocator</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">get_allocator</span><span class="special">());</span> 816 <span class="special">})</span> 817 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 818 <span class="identifier">BOOST_CONTRACT_ASSERT_AUDIT</span><span class="special">(</span> 819 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">condition_if</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span> 820 <span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">></span> <span class="special">>(</span> 821 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">equal_to</span><span class="special"><</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(),</span> 822 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(*</span><span class="keyword">this</span><span class="special">),</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(*</span><span class="identifier">old_other</span><span class="special">))</span> 823 <span class="special">)</span> 824 <span class="special">);</span> 825 <span class="identifier">BOOST_CONTRACT_ASSERT_AUDIT</span><span class="special">(</span> 826 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">condition_if</span><span class="special"><</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span> 827 <span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">></span> <span class="special">>(</span> 828 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">equal_to</span><span class="special"><</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>(),</span> 829 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(</span><span class="identifier">other</span><span class="special">),</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">cref</span><span class="special">(*</span><span class="identifier">old_me</span><span class="special">))</span> 830 <span class="special">)</span> 831 <span class="special">);</span> 832 <span class="special">})</span> 833 <span class="special">;</span> 834 835 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">swap</span><span class="special">(</span><span class="identifier">other</span><span class="special">);</span> 836 <span class="special">}</span> 837 838 <span class="keyword">friend</span> <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">==(</span><span class="identifier">vector</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">left</span><span class="special">,</span> <span class="identifier">vector</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">right</span><span class="special">)</span> <span class="special">{</span> 839 <span class="comment">// Check class invariants for left and right objects.</span> 840 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">left_inv</span> <span class="special">=</span> 841 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(&</span><span class="identifier">left</span><span class="special">);</span> 842 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">right_inv</span> <span class="special">=</span> 843 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(&</span><span class="identifier">right</span><span class="special">);</span> 844 <span class="keyword">return</span> <span class="identifier">left</span><span class="special">.</span><span class="identifier">vect_</span> <span class="special">==</span> <span class="identifier">right</span><span class="special">.</span><span class="identifier">vect_</span><span class="special">;</span> 845 <span class="special">}</span> 846 847<span class="keyword">private</span><span class="special">:</span> 848 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">></span> <span class="identifier">vect_</span><span class="special">;</span> 849<span class="special">};</span> 850 851<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 852 <span class="comment">// char type has operator==.</span> 853 854 <span class="identifier">vector</span><span class="special"><</span><span class="keyword">char</span><span class="special">></span> <span class="identifier">v</span><span class="special">(</span><span class="number">3</span><span class="special">);</span> 855 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">v</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="number">3</span><span class="special">);</span> 856 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">algorithm</span><span class="special">::</span><span class="identifier">all_of_equal</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="char">'\0'</span><span class="special">));</span> 857 858 <span class="identifier">vector</span><span class="special"><</span><span class="keyword">char</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">cv</span> <span class="special">=</span> <span class="identifier">v</span><span class="special">;</span> 859 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">cv</span> <span class="special">==</span> <span class="identifier">v</span><span class="special">);</span> 860 861 <span class="identifier">vector</span><span class="special"><</span><span class="keyword">char</span><span class="special">></span> <span class="identifier">w</span><span class="special">(</span><span class="identifier">v</span><span class="special">);</span> 862 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">w</span> <span class="special">==</span> <span class="identifier">v</span><span class="special">);</span> 863 864 <span class="keyword">typename</span> <span class="identifier">vector</span><span class="special"><</span><span class="keyword">char</span><span class="special">>::</span><span class="identifier">iterator</span> <span class="identifier">i</span> <span class="special">=</span> <span class="identifier">v</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> 865 <span class="identifier">assert</span><span class="special">(*</span><span class="identifier">i</span> <span class="special">==</span> <span class="char">'\0'</span><span class="special">);</span> 866 867 <span class="keyword">typename</span> <span class="identifier">vector</span><span class="special"><</span><span class="keyword">char</span><span class="special">>::</span><span class="identifier">const_iterator</span> <span class="identifier">ci</span> <span class="special">=</span> <span class="identifier">cv</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> 868 <span class="identifier">assert</span><span class="special">(*</span><span class="identifier">ci</span> <span class="special">==</span> <span class="char">'\0'</span><span class="special">);</span> 869 870 <span class="identifier">v</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="char">'a'</span><span class="special">);</span> 871 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">v</span><span class="special">[</span><span class="number">0</span><span class="special">]</span> <span class="special">==</span> <span class="char">'a'</span><span class="special">);</span> 872 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">v</span><span class="special">[</span><span class="number">1</span><span class="special">]</span> <span class="special">==</span> <span class="char">'a'</span><span class="special">);</span> 873 874 <span class="identifier">v</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="char">'b'</span><span class="special">);</span> 875 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">v</span><span class="special">.</span><span class="identifier">back</span><span class="special">()</span> <span class="special">==</span> <span class="char">'b'</span><span class="special">);</span> 876 877 <span class="keyword">struct</span> <span class="identifier">x</span> <span class="special">{};</span> <span class="comment">// x type doest not have operator==.</span> 878 879 <span class="identifier">vector</span><span class="special"><</span><span class="identifier">x</span><span class="special">></span> <span class="identifier">y</span><span class="special">(</span><span class="number">3</span><span class="special">);</span> 880 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">y</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="number">3</span><span class="special">);</span> 881 882 <span class="identifier">vector</span><span class="special"><</span><span class="identifier">x</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">cy</span> <span class="special">=</span> <span class="identifier">y</span><span class="special">;</span> 883 <span class="identifier">vector</span><span class="special"><</span><span class="identifier">x</span><span class="special">></span> <span class="identifier">z</span><span class="special">(</span><span class="identifier">y</span><span class="special">);</span> 884 885 <span class="keyword">typename</span> <span class="identifier">vector</span><span class="special"><</span><span class="identifier">x</span><span class="special">>::</span><span class="identifier">iterator</span> <span class="identifier">j</span> <span class="special">=</span> <span class="identifier">y</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> 886 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">j</span> <span class="special">!=</span> <span class="identifier">y</span><span class="special">.</span><span class="identifier">end</span><span class="special">());</span> 887 <span class="keyword">typename</span> <span class="identifier">vector</span><span class="special"><</span><span class="identifier">x</span><span class="special">>::</span><span class="identifier">const_iterator</span> <span class="identifier">cj</span> <span class="special">=</span> <span class="identifier">cy</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> 888 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">cj</span> <span class="special">!=</span> <span class="identifier">cy</span><span class="special">.</span><span class="identifier">end</span><span class="special">());</span> 889 890 <span class="identifier">y</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">j</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="identifier">x</span><span class="special">());</span> 891 <span class="identifier">y</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">x</span><span class="special">());</span> 892 893 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 894<span class="special">}</span> 895</pre> 896<p> 897 </p> 898 </td> 899<td> 900 <p> 901</p> 902<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="comment">// Extra spaces, newlines, etc. for visual alignment with this library code.</span> 903 904<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">algorithm</span><span class="special">/</span><span class="identifier">cxx11</span><span class="special">/</span><span class="identifier">all_of</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 905<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">/</span><span class="identifier">has_equal_to</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 906<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">next_prior</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 907<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">vector</span><span class="special">></span> 908<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iterator</span><span class="special">></span> 909<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">memory</span><span class="special">></span> 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939<span class="keyword">template</span><span class="special"><</span> <span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Allocator</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">></span> 940<span class="keyword">class</span> <span class="identifier">vector</span> <span class="special">{</span> 941 942 943 <span class="identifier">invariant</span> <span class="special">{</span> 944 <span class="identifier">empty</span><span class="special">()</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span> 945 <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">end</span><span class="special">())</span> <span class="special">==</span> <span class="keyword">int</span><span class="special">(</span><span class="identifier">size</span><span class="special">());</span> 946 <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">rbegin</span><span class="special">(),</span> <span class="identifier">rend</span><span class="special">())</span> <span class="special">==</span> <span class="keyword">int</span><span class="special">(</span><span class="identifier">size</span><span class="special">());</span> 947 <span class="identifier">size</span><span class="special">()</span> <span class="special"><=</span> <span class="identifier">capacity</span><span class="special">();</span> 948 <span class="identifier">capacity</span><span class="special">()</span> <span class="special"><=</span> <span class="identifier">max_size</span><span class="special">();</span> 949 <span class="special">}</span> 950 951<span class="keyword">public</span><span class="special">:</span> 952 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">allocator_type</span> <span class="identifier">allocator_type</span><span class="special">;</span> 953 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">pointer</span> <span class="identifier">pointer</span><span class="special">;</span> 954 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">const_pointer</span> <span class="identifier">const_pointer</span><span class="special">;</span> 955 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">reference</span> <span class="identifier">reference</span><span class="special">;</span> 956 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">const_reference</span> <span class="identifier">const_reference</span><span class="special">;</span> 957 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">value_type</span> <span class="identifier">value_type</span><span class="special">;</span> 958 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">iterator</span> <span class="identifier">iterator</span><span class="special">;</span> 959 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">const_iterator</span> <span class="identifier">const_iterator</span><span class="special">;</span> 960 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">size_type</span> <span class="identifier">size_type</span><span class="special">;</span> 961 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">difference_type</span> <span class="identifier">difference_type</span><span class="special">;</span> 962 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">reverse_iterator</span> 963 <span class="identifier">reverse_iterator</span><span class="special">;</span> 964 <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>::</span><span class="identifier">const_reverse_iterator</span> 965 <span class="identifier">const_reverse_iterator</span><span class="special">;</span> 966 967 <span class="identifier">vector</span><span class="special">()</span> 968 <span class="identifier">postcondition</span> <span class="special">{</span> 969 <span class="identifier">empty</span><span class="special">();</span> 970 <span class="special">}</span> 971 <span class="special">:</span> <span class="identifier">vect_</span><span class="special">()</span> 972 <span class="special">{}</span> 973 974 975 <span class="keyword">explicit</span> <span class="identifier">vector</span><span class="special">(</span><span class="identifier">Allocator</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">alloc</span><span class="special">)</span> 976 <span class="identifier">postcondition</span> <span class="special">{</span> 977 <span class="identifier">empty</span><span class="special">();</span> 978 <span class="identifier">get_allocator</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">alloc</span><span class="special">;</span> 979 <span class="special">}</span> 980 <span class="special">:</span> <span class="identifier">vect_</span><span class="special">(</span><span class="identifier">alloc</span><span class="special">)</span> 981 <span class="special">{}</span> 982 983 984 <span class="keyword">explicit</span> <span class="identifier">vector</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">count</span><span class="special">)</span> 985 <span class="identifier">postcondition</span> <span class="special">{</span> 986 <span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">count</span><span class="special">;</span> 987 <span class="keyword">if</span> <span class="keyword">constexpr</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 988 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">algorithm</span><span class="special">::</span><span class="identifier">all_of_equal</span><span class="special">(</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">end</span><span class="special">(),</span> <span class="identifier">T</span><span class="special">());</span> 989 <span class="special">}</span> 990 <span class="special">}</span> 991 <span class="special">:</span> <span class="identifier">vect_</span><span class="special">(</span><span class="identifier">count</span><span class="special">)</span> 992 <span class="special">{}</span> 993 994 995 996 997 <span class="identifier">vector</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">count</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">)</span> 998 <span class="identifier">postcondition</span> <span class="special">{</span> 999 <span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">count</span><span class="special">;</span> 1000 <span class="keyword">if</span> <span class="keyword">constexpr</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 1001 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">algorithm</span><span class="special">::</span><span class="identifier">all_of_equal</span><span class="special">(</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">end</span><span class="special">(),</span> <span class="identifier">value</span><span class="special">);</span> 1002 <span class="special">}</span> 1003 <span class="special">}</span> 1004 <span class="special">:</span> <span class="identifier">vect_</span><span class="special">(</span><span class="identifier">count</span><span class="special">,</span> <span class="identifier">value</span><span class="special">)</span> 1005 <span class="special">{}</span> 1006 1007 1008 1009 1010 1011 <span class="identifier">vector</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">count</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">,</span> <span class="identifier">Allocator</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">alloc</span><span class="special">)</span> 1012 <span class="identifier">postcondition</span> <span class="special">{</span> 1013 <span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">count</span><span class="special">;</span> 1014 <span class="keyword">if</span> <span class="keyword">constexpr</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 1015 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">algorithm</span><span class="special">::</span><span class="identifier">all_of_equal</span><span class="special">(</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">end</span><span class="special">(),</span> <span class="identifier">value</span><span class="special">);</span> 1016 <span class="special">}</span> 1017 <span class="identifier">get_allocator</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">alloc</span><span class="special">;</span> 1018 <span class="special">}</span> 1019 <span class="special">:</span> <span class="identifier">vect_</span><span class="special">(</span><span class="identifier">count</span><span class="special">,</span> <span class="identifier">value</span><span class="special">,</span> <span class="identifier">alloc</span><span class="special">)</span> 1020 <span class="special">{}</span> 1021 1022 1023 1024 1025 1026 1027 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">InputIter</span><span class="special">></span> 1028 <span class="identifier">vector</span><span class="special">(</span><span class="identifier">InputIter</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">InputIter</span> <span class="identifier">last</span><span class="special">)</span> 1029 <span class="identifier">postcondition</span> <span class="special">{</span> 1030 <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">)</span> <span class="special">==</span> <span class="keyword">int</span><span class="special">(</span><span class="identifier">size</span><span class="special">());</span> 1031 <span class="special">}</span> 1032 <span class="special">:</span> <span class="identifier">vect_</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">)</span> 1033 <span class="special">{}</span> 1034 1035 1036 1037 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">InputIter</span><span class="special">></span> 1038 <span class="identifier">vector</span><span class="special">(</span><span class="identifier">InputIter</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">InputIter</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">Allocator</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">alloc</span><span class="special">)</span> 1039 <span class="identifier">postcondition</span> <span class="special">{</span> 1040 <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">)</span> <span class="special">==</span> <span class="keyword">int</span><span class="special">(</span><span class="identifier">size</span><span class="special">());</span> 1041 <span class="identifier">get_allocator</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">alloc</span><span class="special">;</span> 1042 <span class="special">}</span> 1043 <span class="special">:</span> <span class="identifier">vect_</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">alloc</span><span class="special">)</span> 1044 <span class="special">{}</span> 1045 1046 1047 1048 1049 <span class="comment">/* implicit */</span> <span class="identifier">vector</span><span class="special">(</span><span class="identifier">vector</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">other</span><span class="special">)</span> 1050 <span class="identifier">postcondition</span> <span class="special">{</span> 1051 <span class="keyword">if</span> <span class="keyword">constexpr</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 1052 <span class="special">*</span><span class="keyword">this</span> <span class="special">==</span> <span class="identifier">other</span><span class="special">;</span> 1053 <span class="special">}</span> 1054 <span class="special">}</span> 1055 <span class="special">:</span> <span class="identifier">vect_</span><span class="special">(</span><span class="identifier">other</span><span class="special">.</span><span class="identifier">vect_</span><span class="special">)</span> 1056 <span class="special">{}</span> 1057 1058 1059 1060 1061 1062 <span class="identifier">vector</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">=(</span><span class="identifier">vector</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">other</span><span class="special">)</span> 1063 <span class="identifier">postcondition</span><span class="special">(</span><span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 1064 <span class="keyword">if</span> <span class="keyword">constexpr</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 1065 <span class="special">*</span><span class="keyword">this</span> <span class="special">==</span> <span class="identifier">other</span><span class="special">;</span> 1066 <span class="identifier">result</span> <span class="special">==</span> <span class="special">*</span><span class="keyword">this</span><span class="special">;</span> 1067 <span class="special">}</span> 1068 <span class="special">}</span> 1069 <span class="special">{</span> 1070 <span class="keyword">if</span><span class="special">(</span><span class="keyword">this</span> <span class="special">!=</span> <span class="special">&</span><span class="identifier">other</span><span class="special">)</span> <span class="identifier">vect_</span> <span class="special">=</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">vect_</span><span class="special">;</span> 1071 <span class="keyword">return</span> <span class="special">*</span><span class="keyword">this</span><span class="special">;</span> 1072 <span class="special">}</span> 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">vector</span><span class="special">()</span> <span class="special">{}</span> 1086 1087 1088 1089 1090 <span class="keyword">void</span> <span class="identifier">reserve</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">count</span><span class="special">)</span> 1091 <span class="identifier">precondition</span> <span class="special">{</span> 1092 <span class="identifier">count</span> <span class="special"><</span> <span class="identifier">max_size</span><span class="special">();</span> 1093 <span class="special">}</span> 1094 <span class="identifier">postcondition</span> <span class="special">{</span> 1095 <span class="identifier">capacity</span><span class="special">()</span> <span class="special">>=</span> <span class="identifier">count</span><span class="special">;</span> 1096 <span class="special">}</span> 1097 <span class="special">{</span> 1098 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">reserve</span><span class="special">(</span><span class="identifier">count</span><span class="special">);</span> 1099 <span class="special">}</span> 1100 1101 1102 1103 <span class="identifier">size_type</span> <span class="identifier">capacity</span><span class="special">()</span> <span class="keyword">const</span> 1104 <span class="identifier">postcondition</span><span class="special">(</span><span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 1105 <span class="identifier">result</span> <span class="special">>=</span> <span class="identifier">size</span><span class="special">();</span> 1106 <span class="special">}</span> 1107 <span class="special">{</span> 1108 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">();</span> 1109 <span class="special">}</span> 1110 1111 1112 1113 1114 <span class="identifier">iterator</span> <span class="identifier">begin</span><span class="special">()</span> 1115 <span class="identifier">postcondition</span> <span class="special">{</span> 1116 <span class="keyword">if</span><span class="special">(</span><span class="identifier">empty</span><span class="special">())</span> <span class="identifier">result</span> <span class="special">==</span> <span class="identifier">end</span><span class="special">();</span> 1117 <span class="special">}</span> 1118 <span class="special">{</span> 1119 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> 1120 <span class="special">}</span> 1121 1122 1123 1124 1125 <span class="identifier">const_iterator</span> <span class="identifier">begin</span><span class="special">()</span> <span class="keyword">const</span> 1126 <span class="identifier">postcondition</span><span class="special">(</span><span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 1127 <span class="keyword">if</span><span class="special">(</span><span class="identifier">empty</span><span class="special">())</span> <span class="identifier">result</span> <span class="special">==</span> <span class="identifier">end</span><span class="special">();</span> 1128 <span class="special">}</span> 1129 <span class="special">{</span> 1130 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> 1131 <span class="special">}</span> 1132 1133 1134 1135 1136 <span class="identifier">iterator</span> <span class="identifier">end</span><span class="special">()</span> <span class="special">{</span> 1137 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span> 1138 <span class="special">}</span> 1139 1140 1141 1142 <span class="identifier">const_iterator</span> <span class="identifier">end</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 1143 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span> 1144 <span class="special">}</span> 1145 1146 1147 1148 <span class="identifier">reverse_iterator</span> <span class="identifier">rbegin</span><span class="special">()</span> 1149 <span class="identifier">postcondition</span><span class="special">(</span><span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 1150 <span class="keyword">if</span><span class="special">(</span><span class="identifier">empty</span><span class="special">())</span> <span class="identifier">result</span> <span class="special">==</span> <span class="identifier">rend</span><span class="special">();</span> 1151 <span class="special">}</span> 1152 <span class="special">{</span> 1153 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">rbegin</span><span class="special">();</span> 1154 <span class="special">}</span> 1155 1156 1157 1158 1159 <span class="identifier">const_reverse_iterator</span> <span class="identifier">rbegin</span><span class="special">()</span> <span class="keyword">const</span> 1160 <span class="identifier">postcondition</span><span class="special">(</span><span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 1161 <span class="keyword">if</span><span class="special">(</span><span class="identifier">empty</span><span class="special">())</span> <span class="identifier">result</span> <span class="special">==</span> <span class="identifier">rend</span><span class="special">();</span> 1162 <span class="special">}</span> 1163 <span class="special">{</span> 1164 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">rbegin</span><span class="special">();</span> 1165 <span class="special">}</span> 1166 1167 1168 1169 1170 <span class="identifier">reverse_iterator</span> <span class="identifier">rend</span><span class="special">()</span> <span class="special">{</span> 1171 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">rend</span><span class="special">();</span> 1172 <span class="special">}</span> 1173 1174 1175 1176 <span class="identifier">const_reverse_iterator</span> <span class="identifier">rend</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 1177 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">rend</span><span class="special">();</span> 1178 <span class="special">}</span> 1179 1180 1181 1182 <span class="keyword">void</span> <span class="identifier">resize</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">count</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">())</span> 1183 <span class="identifier">postcondition</span> <span class="special">{</span> 1184 <span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">count</span><span class="special">;</span> 1185 <span class="keyword">if</span> <span class="keyword">constexpr</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 1186 <span class="keyword">if</span><span class="special">(</span><span class="identifier">count</span> <span class="special">></span> <span class="identifier">oldof</span><span class="special">(</span><span class="identifier">size</span><span class="special">()))</span> <span class="special">{</span> 1187 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">algorithm</span><span class="special">::</span><span class="identifier">all_of_equal</span><span class="special">(</span><span class="identifier">begin</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">oldof</span><span class="special">(</span><span class="identifier">size</span><span class="special">()),</span> 1188 <span class="identifier">end</span><span class="special">(),</span> <span class="identifier">value</span><span class="special">);</span> 1189 <span class="special">}</span> 1190 <span class="special">}</span> 1191 <span class="special">}</span> 1192 <span class="special">{</span> 1193 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">resize</span><span class="special">(</span><span class="identifier">count</span><span class="special">,</span> <span class="identifier">value</span><span class="special">);</span> 1194 <span class="special">}</span> 1195 1196 1197 1198 1199 1200 1201 1202 <span class="identifier">size_type</span> <span class="identifier">size</span><span class="special">()</span> <span class="keyword">const</span> 1203 <span class="identifier">postcondition</span><span class="special">(</span><span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 1204 <span class="identifier">result</span> <span class="special"><=</span> <span class="identifier">capacity</span><span class="special">();</span> 1205 <span class="special">}</span> 1206 <span class="special">{</span> 1207 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">size</span><span class="special">();</span> 1208 <span class="special">}</span> 1209 1210 1211 1212 1213 <span class="identifier">size_type</span> <span class="identifier">max_size</span><span class="special">()</span> <span class="keyword">const</span> 1214 <span class="identifier">postcondition</span><span class="special">(</span><span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 1215 <span class="identifier">result</span> <span class="special">>=</span> <span class="identifier">capacity</span><span class="special">();</span> 1216 <span class="special">}</span> 1217 <span class="special">{</span> 1218 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">max_size</span><span class="special">();</span> 1219 <span class="special">}</span> 1220 1221 1222 1223 1224 <span class="keyword">bool</span> <span class="identifier">empty</span><span class="special">()</span> <span class="keyword">const</span> 1225 <span class="identifier">postcondition</span><span class="special">(</span><span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 1226 <span class="identifier">result</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span> 1227 <span class="special">}</span> 1228 <span class="special">{</span> 1229 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">empty</span><span class="special">();</span> 1230 <span class="special">}</span> 1231 1232 1233 1234 1235 <span class="identifier">Alloctor</span> <span class="identifier">get_allocator</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 1236 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">get_allocator</span><span class="special">();</span> 1237 <span class="special">}</span> 1238 1239 1240 1241 <span class="identifier">reference</span> <span class="identifier">at</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">index</span><span class="special">)</span> <span class="special">{</span> 1242 <span class="comment">// No precondition (throw out_of_range for invalid index).</span> 1243 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">at</span><span class="special">(</span><span class="identifier">index</span><span class="special">);</span> 1244 <span class="special">}</span> 1245 1246 1247 <span class="identifier">const_reference</span> <span class="identifier">at</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">index</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> 1248 <span class="comment">// No precondition (throw out_of_range for invalid index).</span> 1249 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">at</span><span class="special">(</span><span class="identifier">index</span><span class="special">);</span> 1250 <span class="special">}</span> 1251 1252 1253 <span class="identifier">reference</span> <span class="keyword">operator</span><span class="special">[](</span><span class="identifier">size_type</span> <span class="identifier">index</span><span class="special">)</span> 1254 <span class="identifier">precondition</span> <span class="special">{</span> 1255 <span class="identifier">index</span> <span class="special"><</span> <span class="identifier">size</span><span class="special">();</span> 1256 <span class="special">}</span> 1257 <span class="special">{</span> 1258 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">[</span><span class="identifier">index</span><span class="special">];</span> 1259 <span class="special">}</span> 1260 1261 1262 1263 <span class="identifier">const_reference</span> <span class="keyword">operator</span><span class="special">[](</span><span class="identifier">size_type</span> <span class="identifier">index</span><span class="special">)</span> <span class="keyword">const</span> 1264 <span class="identifier">precondition</span> <span class="special">{</span> 1265 <span class="identifier">index</span> <span class="special"><</span> <span class="identifier">size</span><span class="special">();</span> 1266 <span class="special">}</span> 1267 <span class="special">{</span> 1268 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">[</span><span class="identifier">index</span><span class="special">];</span> 1269 <span class="special">}</span> 1270 1271 1272 1273 <span class="identifier">reference</span> <span class="identifier">front</span><span class="special">()</span> 1274 <span class="identifier">precondition</span> <span class="special">{</span> 1275 <span class="special">!</span><span class="identifier">empty</span><span class="special">();</span> 1276 <span class="special">}</span> 1277 <span class="special">{</span> 1278 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">front</span><span class="special">();</span> 1279 <span class="special">}</span> 1280 1281 1282 1283 <span class="identifier">const_reference</span> <span class="identifier">front</span><span class="special">()</span> <span class="keyword">const</span> 1284 <span class="identifier">precondition</span> <span class="special">{</span> 1285 <span class="special">!</span><span class="identifier">empty</span><span class="special">();</span> 1286 <span class="special">}</span> 1287 <span class="special">{</span> 1288 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">front</span><span class="special">();</span> 1289 <span class="special">}</span> 1290 1291 1292 1293 <span class="identifier">reference</span> <span class="identifier">back</span><span class="special">()</span> 1294 <span class="identifier">precondition</span> <span class="special">{</span> 1295 <span class="special">!</span><span class="identifier">empty</span><span class="special">();</span> 1296 <span class="special">}</span> 1297 <span class="special">{</span> 1298 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">back</span><span class="special">();</span> 1299 <span class="special">}</span> 1300 1301 1302 1303 <span class="identifier">const_reference</span> <span class="identifier">back</span><span class="special">()</span> <span class="keyword">const</span> 1304 <span class="identifier">precondition</span> <span class="special">{</span> 1305 <span class="special">!</span><span class="identifier">empty</span><span class="special">();</span> 1306 <span class="special">}</span> 1307 <span class="special">{</span> 1308 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">back</span><span class="special">();</span> 1309 <span class="special">}</span> 1310 1311 1312 1313 <span class="keyword">void</span> <span class="identifier">push_back</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">)</span> 1314 <span class="identifier">precondition</span> <span class="special">{</span> 1315 <span class="identifier">size</span><span class="special">()</span> <span class="special"><</span> <span class="identifier">max_size</span><span class="special">();</span> 1316 <span class="special">}</span> 1317 <span class="identifier">postcondition</span> <span class="special">{</span> 1318 <span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">oldof</span><span class="special">(</span><span class="identifier">size</span><span class="special">())</span> <span class="special">+</span> <span class="number">1</span><span class="special">;</span> 1319 <span class="identifier">capacity</span><span class="special">()</span> <span class="special">>=</span> <span class="identifier">oldof</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">())</span> 1320 <span class="keyword">if</span> <span class="keyword">constexpr</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 1321 <span class="identifier">back</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">value</span><span class="special">;</span> 1322 <span class="special">}</span> 1323 <span class="special">}</span> 1324 <span class="special">{</span> 1325 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">value</span><span class="special">);</span> 1326 <span class="special">}</span> 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 <span class="keyword">void</span> <span class="identifier">pop_back</span><span class="special">()</span> 1338 <span class="identifier">precondition</span> <span class="special">{</span> 1339 <span class="special">!</span><span class="identifier">empty</span><span class="special">();</span> 1340 <span class="special">}</span> 1341 <span class="identifier">postcondition</span> <span class="special">{</span> 1342 <span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">oldof</span><span class="special">(</span><span class="identifier">size</span><span class="special">())</span> <span class="special">-</span> <span class="number">1</span><span class="special">;</span> 1343 <span class="special">}</span> 1344 <span class="special">{</span> 1345 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">pop_back</span><span class="special">();</span> 1346 <span class="special">}</span> 1347 1348 1349 1350 1351 1352 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">InputIter</span><span class="special">></span> 1353 <span class="keyword">void</span> <span class="identifier">assign</span><span class="special">(</span><span class="identifier">InputIter</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">InputIter</span> <span class="identifier">last</span><span class="special">)</span> 1354 <span class="comment">// Precondition: [begin(), end()) does not contain [first, last).</span> 1355 <span class="identifier">postcondition</span> <span class="special">{</span> 1356 <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">)</span> <span class="special">==</span> <span class="keyword">int</span><span class="special">(</span><span class="identifier">size</span><span class="special">());</span> 1357 <span class="special">}</span> 1358 <span class="special">{</span> 1359 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">assign</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">);</span> 1360 <span class="special">}</span> 1361 1362 1363 1364 1365 1366 1367 1368 <span class="keyword">void</span> <span class="identifier">assign</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">count</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">vallue</span><span class="special">)</span> 1369 <span class="identifier">precondition</span> <span class="special">{</span> 1370 <span class="identifier">count</span> <span class="special"><=</span> <span class="identifier">max_size</span><span class="special">();</span> 1371 <span class="special">}</span> 1372 <span class="identifier">postcondition</span> <span class="special">{</span> 1373 <span class="keyword">if</span> <span class="keyword">constexpr</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 1374 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">algorithm</span><span class="special">::</span><span class="identifier">all_of_equal</span><span class="special">(</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">end</span><span class="special">(),</span> <span class="identifier">value</span><span class="special">);</span> 1375 <span class="special">}</span> 1376 <span class="special">}</span> 1377 <span class="special">{</span> 1378 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">assign</span><span class="special">(</span><span class="identifier">count</span><span class="special">,</span> <span class="identifier">value</span><span class="special">);</span> 1379 <span class="special">}</span> 1380 1381 1382 1383 1384 1385 1386 <span class="identifier">iterator</span> <span class="identifier">insert</span><span class="special">(</span><span class="identifier">iterator</span> <span class="identifier">where</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">)</span> 1387 <span class="identifier">precondition</span> <span class="special">{</span> 1388 <span class="identifier">size</span><span class="special">()</span> <span class="special"><</span> <span class="identifier">max_size</span><span class="special">();</span> 1389 <span class="special">}</span> 1390 <span class="identifier">postcondition</span><span class="special">(</span><span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 1391 <span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">oldof</span><span class="special">(</span><span class="identifier">size</span><span class="special">())</span> <span class="special">+</span> <span class="number">1</span><span class="special">;</span> 1392 <span class="identifier">capacity</span><span class="special">()</span> <span class="special">>=</span> <span class="identifier">oldof</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">());</span> 1393 <span class="keyword">if</span> <span class="keyword">constexpr</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 1394 <span class="special">*</span><span class="identifier">result</span> <span class="special">==</span> <span class="identifier">value</span><span class="special">;</span> 1395 <span class="special">}</span> 1396 <span class="comment">// if(capacity() > oldof(capacity()))</span> 1397 <span class="comment">// [begin(), end()) is invalid</span> 1398 <span class="comment">// else</span> 1399 <span class="comment">// [where, end()) is invalid</span> 1400 <span class="special">}</span> 1401 <span class="special">{</span> 1402 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">where</span><span class="special">,</span> <span class="identifier">value</span><span class="special">);</span> 1403 <span class="special">}</span> 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 <span class="keyword">void</span> <span class="identifier">insert</span><span class="special">(</span><span class="identifier">iterator</span> <span class="identifier">where</span><span class="special">,</span> <span class="identifier">size_type</span> <span class="identifier">count</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">)</span> 1417 <span class="identifier">precondition</span> <span class="special">{</span> 1418 <span class="identifier">size</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">count</span> <span class="special"><</span> <span class="identifier">max_size</span><span class="special">();</span> 1419 <span class="special">}</span> 1420 <span class="identifier">postcondition</span> <span class="special">{</span> 1421 <span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">oldof</span><span class="special">(</span><span class="identifier">size</span><span class="special">())</span> <span class="special">+</span> <span class="identifier">count</span><span class="special">;</span> 1422 <span class="identifier">capacity</span><span class="special">()</span> <span class="special">>=</span> <span class="identifier">oldof</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">());</span> 1423 <span class="keyword">if</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">oldof</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()))</span> <span class="special">{</span> 1424 <span class="keyword">if</span> <span class="keyword">constexpr</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 1425 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">algorithm</span><span class="special">::</span><span class="identifier">all_of_equal</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">prior</span><span class="special">(</span><span class="identifier">oldof</span><span class="special">(</span><span class="identifier">where</span><span class="special">)),</span> 1426 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">prior</span><span class="special">(</span><span class="identifier">oldof</span><span class="special">(</span><span class="identifier">where</span><span class="special">))</span> <span class="special">+</span> <span class="identifier">count</span><span class="special">,</span> <span class="identifier">value</span><span class="special">);</span> 1427 <span class="special">}</span> 1428 <span class="comment">// [where, end()) is invalid</span> 1429 <span class="special">}</span> 1430 <span class="comment">// else [begin(), end()) is invalid</span> 1431 <span class="special">}</span> 1432 <span class="special">{</span> 1433 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">where</span><span class="special">,</span> <span class="identifier">count</span><span class="special">,</span> <span class="identifier">value</span><span class="special">);</span> 1434 <span class="special">}</span> 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">InputIter</span><span class="special">></span> 1449 <span class="keyword">void</span> <span class="identifier">insert</span><span class="special">(</span><span class="identifier">iterator</span> <span class="identifier">where</span><span class="special">,</span> <span class="identifier">Iterator</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">Iterator</span> <span class="identifier">last</span><span class="special">)</span> 1450 <span class="identifier">precondition</span> <span class="special">{</span> 1451 <span class="identifier">size</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">)</span> <span class="special"><</span> <span class="identifier">max_size</span><span class="special">();</span> 1452 <span class="comment">// [first, last) is not contained in [begin(), end())</span> 1453 <span class="special">}</span> 1454 <span class="identifier">postcondition</span> <span class="special">{</span> 1455 <span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">oldof</span><span class="special">(</span><span class="identifier">size</span><span class="special">())</span> <span class="special">+</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">);</span> 1456 <span class="identifier">capacity</span><span class="special">()</span> <span class="special">>=</span> <span class="identifier">oldof</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">());</span> 1457 <span class="keyword">if</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">oldof</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()))</span> <span class="special">{</span> 1458 <span class="keyword">if</span> <span class="keyword">constexpr</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 1459 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">algorithm</span><span class="special">::</span><span class="identifier">all_of_equal</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">,</span> <span class="identifier">oldof</span><span class="special">(</span><span class="identifier">where</span><span class="special">));</span> 1460 <span class="special">}</span> 1461 <span class="comment">// [where, end()) is invalid</span> 1462 <span class="special">}</span> 1463 <span class="comment">// else [begin(), end()) is invalid</span> 1464 <span class="special">}</span> 1465 <span class="special">{</span> 1466 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">where</span><span class="special">,</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">);</span> 1467 <span class="special">}</span> 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 <span class="identifier">iterator</span> <span class="identifier">erase</span><span class="special">(</span><span class="identifier">iterator</span> <span class="identifier">where</span><span class="special">)</span> 1483 <span class="identifier">precondition</span> <span class="special">{</span> 1484 <span class="special">!</span><span class="identifier">empty</span><span class="special">();</span> 1485 <span class="identifier">where</span> <span class="special">!=</span> <span class="identifier">end</span><span class="special">();</span> 1486 <span class="special">}</span> 1487 <span class="identifier">postcondition</span><span class="special">(</span><span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 1488 <span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">oldod</span> <span class="identifier">size</span><span class="special">()</span> <span class="special">-</span> <span class="number">1</span><span class="special">;</span> 1489 <span class="keyword">if</span><span class="special">(</span><span class="identifier">empty</span><span class="special">())</span> <span class="identifier">result</span> <span class="special">==</span> <span class="identifier">end</span><span class="special">();</span> 1490 <span class="comment">// [where, end()) is invalid</span> 1491 <span class="special">}</span> 1492 <span class="special">{</span> 1493 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">erase</span><span class="special">(</span><span class="identifier">where</span><span class="special">);</span> 1494 <span class="special">}</span> 1495 1496 1497 1498 1499 1500 1501 <span class="identifier">iterator</span> <span class="identifier">erase</span><span class="special">(</span><span class="identifier">iterator</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">iterator</span> <span class="identifier">last</span><span class="special">)</span> 1502 <span class="identifier">precondition</span> <span class="special">{</span> 1503 <span class="identifier">size</span><span class="special">()</span> <span class="special">>=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">lasst</span><span class="special">);</span> 1504 <span class="special">}</span> 1505 <span class="identifier">postcondition</span><span class="special">(</span><span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 1506 <span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">oldof</span><span class="special">(</span><span class="identifier">size</span><span class="special">())</span> <span class="special">-</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">);</span> 1507 <span class="keyword">if</span><span class="special">(</span><span class="identifier">empty</span><span class="special">())</span> <span class="identifier">result</span> <span class="special">==</span> <span class="identifier">end</span><span class="special">();</span> 1508 <span class="comment">// [first, last) is invalid</span> 1509 <span class="special">}</span> 1510 <span class="special">{</span> 1511 <span class="keyword">return</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">erase</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">);</span> 1512 <span class="special">}</span> 1513 1514 1515 1516 1517 1518 1519 1520 <span class="keyword">void</span> <span class="identifier">clear</span><span class="special">()</span> 1521 <span class="identifier">postcondition</span> <span class="special">{</span> 1522 <span class="identifier">empty</span><span class="special">();</span> 1523 <span class="special">}</span> 1524 <span class="special">{</span> 1525 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">clear</span><span class="special">();</span> 1526 <span class="special">}</span> 1527 1528 1529 1530 <span class="keyword">void</span> <span class="identifier">swap</span><span class="special">(</span><span class="identifier">vector</span><span class="special">&</span> <span class="identifier">other</span><span class="special">)</span> 1531 <span class="identifier">precondition</span> <span class="special">{</span> 1532 <span class="identifier">get_allocator</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">get_allocator</span><span class="special">();</span> 1533 <span class="special">}</span> 1534 <span class="identifier">postcondition</span> <span class="special">{</span> 1535 <span class="keyword">if</span> <span class="keyword">constexpr</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_equal_to</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 1536 <span class="special">*</span><span class="keyword">this</span> <span class="special">==</span> <span class="identifier">oldof</span><span class="special">(</span><span class="identifier">other</span><span class="special">);</span> 1537 <span class="identifier">other</span> <span class="special">==</span> <span class="identifier">oldof</span><span class="special">(*</span><span class="keyword">this</span><span class="special">);</span> 1538 <span class="special">}</span> 1539 <span class="special">}</span> 1540 <span class="special">{</span> 1541 <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">swap</span><span class="special">(</span><span class="identifier">other</span><span class="special">);</span> 1542 <span class="special">}</span> 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 <span class="keyword">friend</span> <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">==(</span><span class="identifier">vector</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">left</span><span class="special">,</span> <span class="identifier">vector</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">right</span><span class="special">)</span> <span class="special">{</span> 1562 <span class="comment">// Cannot check class invariants for left and right objects.</span> 1563 <span class="keyword">return</span> <span class="identifier">left</span><span class="special">.</span><span class="identifier">vect_</span> <span class="special">==</span> <span class="identifier">right</span><span class="special">.</span><span class="identifier">vect_</span><span class="special">;</span> 1564 <span class="special">}</span> 1565 1566 1567 1568 1569 1570<span class="keyword">private</span><span class="special">:</span> 1571 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">></span> <span class="identifier">vect_</span><span class="special">;</span> 1572<span class="special">};</span> 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617<span class="comment">// End.</span> 1618</pre> 1619<p> 1620 </p> 1621 </td> 1622</tr></tbody> 1623</table></div> 1624</div> 1625<div class="section"> 1626<div class="titlepage"><div><div><h3 class="title"> 1627<a name="boost_contract.examples.__n1962___circle__subcontracting"></a><a class="link" href="examples.html#boost_contract.examples.__n1962___circle__subcontracting" title="[N1962] Circle: Subcontracting">[N1962] 1628 Circle: Subcontracting</a> 1629</h3></div></div></div> 1630<p> 1631</p> 1632<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 1633<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 1634 1635<span class="keyword">class</span> <span class="identifier">shape</span> <span class="special">{</span> 1636<span class="keyword">public</span><span class="special">:</span> 1637 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">shape</span><span class="special">()</span> <span class="special">{}</span> 1638 1639 <span class="keyword">virtual</span> <span class="keyword">unsigned</span> <span class="identifier">compute_area</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> 1640<span class="special">};</span> 1641 1642<span class="keyword">unsigned</span> <span class="identifier">shape</span><span class="special">::</span><span class="identifier">compute_area</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> 1643 <span class="keyword">unsigned</span> <span class="identifier">result</span><span class="special">;</span> 1644 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">result</span><span class="special">,</span> <span class="keyword">this</span><span class="special">)</span> 1645 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">(</span><span class="keyword">int</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 1646 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">></span> <span class="number">0</span><span class="special">);</span> 1647 <span class="special">})</span> 1648 <span class="special">;</span> 1649 <span class="identifier">assert</span><span class="special">(</span><span class="keyword">false</span><span class="special">);</span> 1650 <span class="keyword">return</span> <span class="identifier">result</span><span class="special">;</span> 1651<span class="special">}</span> 1652 1653<span class="keyword">class</span> <span class="identifier">circle</span> 1654 <span class="preprocessor">#define</span> <span class="identifier">BASES</span> <span class="keyword">public</span> <span class="identifier">shape</span> 1655 <span class="special">:</span> <span class="identifier">BASES</span> 1656<span class="special">{</span> 1657 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 1658 1659 <span class="keyword">typedef</span> <span class="identifier">BOOST_CONTRACT_BASE_TYPES</span><span class="special">(</span><span class="identifier">BASES</span><span class="special">)</span> <span class="identifier">base_types</span><span class="special">;</span> 1660 <span class="preprocessor">#undef</span> <span class="identifier">BASES</span> 1661 1662 <span class="identifier">BOOST_CONTRACT_OVERRIDE</span><span class="special">(</span><span class="identifier">compute_area</span><span class="special">);</span> 1663 1664<span class="keyword">public</span><span class="special">:</span> 1665 <span class="keyword">static</span> <span class="keyword">int</span> <span class="keyword">const</span> <span class="identifier">pi</span> <span class="special">=</span> <span class="number">3</span><span class="special">;</span> <span class="comment">// Truncated to int from 3.14...</span> 1666 1667 <span class="keyword">explicit</span> <span class="identifier">circle</span><span class="special">(</span><span class="keyword">unsigned</span> <span class="identifier">a_radius</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">radius_</span><span class="special">(</span><span class="identifier">a_radius</span><span class="special">)</span> <span class="special">{</span> 1668 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 1669 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 1670 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">radius</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">a_radius</span><span class="special">);</span> 1671 <span class="special">})</span> 1672 <span class="special">;</span> 1673 <span class="special">}</span> 1674 1675 <span class="keyword">virtual</span> <span class="keyword">unsigned</span> <span class="identifier">compute_area</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">const</span> 1676 <span class="comment">/* override */</span> <span class="special">{</span> 1677 <span class="keyword">unsigned</span> <span class="identifier">result</span><span class="special">;</span> 1678 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special"><</span> 1679 <span class="identifier">override_compute_area</span><span class="special">>(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">result</span><span class="special">,</span> <span class="special">&</span><span class="identifier">circle</span><span class="special">::</span><span class="identifier">compute_area</span><span class="special">,</span> <span class="keyword">this</span><span class="special">)</span> 1680 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">(</span><span class="keyword">unsigned</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 1681 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">==</span> <span class="identifier">pi</span> <span class="special">*</span> <span class="identifier">radius</span><span class="special">()</span> <span class="special">*</span> <span class="identifier">radius</span><span class="special">());</span> 1682 <span class="special">})</span> 1683 <span class="special">;</span> 1684 1685 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">pi</span> <span class="special">*</span> <span class="identifier">radius</span><span class="special">()</span> <span class="special">*</span> <span class="identifier">radius</span><span class="special">();</span> 1686 <span class="special">}</span> 1687 1688 <span class="keyword">unsigned</span> <span class="identifier">radius</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 1689 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 1690 <span class="keyword">return</span> <span class="identifier">radius_</span><span class="special">;</span> 1691 <span class="special">}</span> 1692 1693<span class="keyword">private</span><span class="special">:</span> 1694 <span class="keyword">unsigned</span> <span class="identifier">radius_</span><span class="special">;</span> 1695<span class="special">};</span> 1696 1697<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 1698 <span class="identifier">circle</span> <span class="identifier">c</span><span class="special">(</span><span class="number">2</span><span class="special">);</span> 1699 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">c</span><span class="special">.</span><span class="identifier">radius</span><span class="special">()</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span> 1700 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">c</span><span class="special">.</span><span class="identifier">compute_area</span><span class="special">()</span> <span class="special">==</span> <span class="number">12</span><span class="special">);</span> 1701 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 1702<span class="special">}</span> 1703</pre> 1704<p> 1705 </p> 1706</div> 1707<div class="section"> 1708<div class="titlepage"><div><div><h3 class="title"> 1709<a name="boost_contract.examples.__n1962___factorial__recursion"></a><a name="N1962_factorial_anchor"></a><a class="link" href="examples.html#boost_contract.examples.__n1962___factorial__recursion" title="[N1962] Factorial: Recursion">[N1962] 1710 Factorial: Recursion</a> 1711</h3></div></div></div> 1712<p> 1713</p> 1714<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 1715<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 1716 1717<span class="keyword">int</span> <span class="identifier">factorial</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">{</span> 1718 <span class="keyword">int</span> <span class="identifier">result</span><span class="special">;</span> 1719 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">function</span><span class="special">()</span> 1720 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 1721 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">n</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> <span class="comment">// Non-negative natural number.</span> 1722 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">n</span> <span class="special"><=</span> <span class="number">12</span><span class="special">);</span> <span class="comment">// Max function input.</span> 1723 <span class="special">})</span> 1724 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 1725 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">>=</span> <span class="number">1</span><span class="special">);</span> 1726 <span class="keyword">if</span><span class="special">(</span><span class="identifier">n</span> <span class="special"><</span> <span class="number">2</span><span class="special">)</span> <span class="special">{</span> <span class="comment">// Select assertion.</span> 1727 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span> 1728 <span class="special">}</span> <span class="keyword">else</span> <span class="special">{</span> 1729 <span class="comment">// Assertions automatically disabled in other assertions.</span> 1730 <span class="comment">// Therefore, this postcondition can recursively call the</span> 1731 <span class="comment">// function without causing infinite recursion.</span> 1732 <span class="identifier">BOOST_CONTRACT_ASSERT_AUDIT</span><span class="special">(</span><span class="identifier">n</span> <span class="special">*</span> <span class="identifier">factorial</span><span class="special">(</span><span class="identifier">n</span> <span class="special">-</span> <span class="number">1</span><span class="special">));</span> 1733 <span class="special">}</span> 1734 <span class="special">})</span> 1735 <span class="special">;</span> 1736 1737 <span class="keyword">return</span> <span class="identifier">n</span> <span class="special"><</span> <span class="number">2</span> <span class="special">?</span> <span class="special">(</span><span class="identifier">result</span> <span class="special">=</span> <span class="number">1</span><span class="special">)</span> <span class="special">:</span> <span class="special">(</span><span class="identifier">result</span> <span class="special">=</span> <span class="identifier">n</span> <span class="special">*</span> <span class="identifier">factorial</span><span class="special">(</span><span class="identifier">n</span> <span class="special">-</span> <span class="number">1</span><span class="special">));</span> 1738<span class="special">}</span> 1739 1740<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 1741 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">factorial</span><span class="special">(</span><span class="number">4</span><span class="special">)</span> <span class="special">==</span> <span class="number">24</span><span class="special">);</span> 1742 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 1743<span class="special">}</span> 1744</pre> 1745<p> 1746 </p> 1747</div> 1748<div class="section"> 1749<div class="titlepage"><div><div><h3 class="title"> 1750<a name="boost_contract.examples.__n1962___equal__operators"></a><a class="link" href="examples.html#boost_contract.examples.__n1962___equal__operators" title="[N1962] Equal: Operators">[N1962] 1751 Equal: Operators</a> 1752</h3></div></div></div> 1753<p> 1754</p> 1755<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 1756<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 1757 1758<span class="comment">// Forward declaration because == and != contracts use one another's function.</span> 1759<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 1760<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">==(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">left</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">right</span><span class="special">);</span> 1761 1762<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 1763<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!=(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">left</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">right</span><span class="special">)</span> <span class="special">{</span> 1764 <span class="keyword">bool</span> <span class="identifier">result</span><span class="special">;</span> 1765 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">function</span><span class="special">()</span> 1766 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 1767 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">==</span> <span class="special">!(</span><span class="identifier">left</span> <span class="special">==</span> <span class="identifier">right</span><span class="special">));</span> 1768 <span class="special">})</span> 1769 <span class="special">;</span> 1770 1771 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">left</span><span class="special">.</span><span class="identifier">value</span> <span class="special">!=</span> <span class="identifier">right</span><span class="special">.</span><span class="identifier">value</span><span class="special">);</span> 1772<span class="special">}</span> 1773 1774<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 1775<span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">==(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">left</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">right</span><span class="special">)</span> <span class="special">{</span> 1776 <span class="keyword">bool</span> <span class="identifier">result</span><span class="special">;</span> 1777 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">function</span><span class="special">()</span> 1778 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 1779 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">==</span> <span class="special">!(</span><span class="identifier">left</span> <span class="special">!=</span> <span class="identifier">right</span><span class="special">));</span> 1780 <span class="special">})</span> 1781 <span class="special">;</span> 1782 1783 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">left</span><span class="special">.</span><span class="identifier">value</span> <span class="special">==</span> <span class="identifier">right</span><span class="special">.</span><span class="identifier">value</span><span class="special">);</span> 1784<span class="special">}</span> 1785 1786<span class="keyword">struct</span> <span class="identifier">number</span> <span class="special">{</span> <span class="keyword">int</span> <span class="identifier">value</span><span class="special">;</span> <span class="special">};</span> 1787 1788<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 1789 <span class="identifier">number</span> <span class="identifier">n</span><span class="special">;</span> 1790 <span class="identifier">n</span><span class="special">.</span><span class="identifier">value</span> <span class="special">=</span> <span class="number">123</span><span class="special">;</span> 1791 1792 <span class="identifier">assert</span><span class="special">((</span><span class="identifier">n</span> <span class="special">==</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">);</span> <span class="comment">// Explicitly call operator==.</span> 1793 <span class="identifier">assert</span><span class="special">((</span><span class="identifier">n</span> <span class="special">!=</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">==</span> <span class="keyword">false</span><span class="special">);</span> <span class="comment">// Explicitly call operator!=.</span> 1794 1795 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 1796<span class="special">}</span> 1797</pre> 1798<p> 1799 </p> 1800</div> 1801<div class="section"> 1802<div class="titlepage"><div><div><h3 class="title"> 1803<a name="boost_contract.examples.__n1962___sum__array_parameter"></a><a class="link" href="examples.html#boost_contract.examples.__n1962___sum__array_parameter" title="[N1962] Sum: Array parameter">[N1962] 1804 Sum: Array parameter</a> 1805</h3></div></div></div> 1806<p> 1807</p> 1808<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 1809<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 1810 1811<span class="keyword">int</span> <span class="identifier">sum</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">count</span><span class="special">,</span> <span class="keyword">int</span><span class="special">*</span> <span class="identifier">array</span><span class="special">)</span> <span class="special">{</span> 1812 <span class="keyword">int</span> <span class="identifier">result</span><span class="special">;</span> 1813 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">function</span><span class="special">()</span> 1814 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 1815 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span> <span class="special">%</span> <span class="number">4</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span> 1816 <span class="special">})</span> 1817 <span class="special">;</span> 1818 1819 <span class="identifier">result</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> 1820 <span class="keyword">for</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">count</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="identifier">result</span> <span class="special">+=</span> <span class="identifier">array</span><span class="special">[</span><span class="identifier">i</span><span class="special">];</span> 1821 <span class="keyword">return</span> <span class="identifier">result</span><span class="special">;</span> 1822<span class="special">}</span> 1823 1824<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 1825 <span class="keyword">int</span> <span class="identifier">a</span><span class="special">[</span><span class="number">4</span><span class="special">]</span> <span class="special">=</span> <span class="special">{</span><span class="number">1</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="number">3</span><span class="special">,</span> <span class="number">4</span><span class="special">};</span> 1826 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">sum</span><span class="special">(</span><span class="number">4</span><span class="special">,</span> <span class="identifier">a</span><span class="special">)</span> <span class="special">==</span> <span class="number">10</span><span class="special">);</span> 1827 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 1828<span class="special">}</span> 1829</pre> 1830<p> 1831 </p> 1832</div> 1833<div class="section"> 1834<div class="titlepage"><div><div><h3 class="title"> 1835<a name="boost_contract.examples.__n1962___square_root__default_parameters_and_comparison_with_d_syntax"></a><a name="N1962_square_root_anchor"></a><a class="link" href="examples.html#boost_contract.examples.__n1962___square_root__default_parameters_and_comparison_with_d_syntax" title="[N1962] Square Root: Default parameters and comparison with D syntax">[N1962] 1836 Square Root: Default parameters and comparison with D syntax</a> 1837</h3></div></div></div> 1838<div class="informaltable"><table class="table"> 1839<colgroup> 1840<col> 1841<col> 1842</colgroup> 1843<thead><tr> 1844<th> 1845 <p> 1846 This Library 1847 </p> 1848 </th> 1849<th> 1850 <p> 1851 The D Programming Language 1852 </p> 1853 </th> 1854</tr></thead> 1855<tbody><tr> 1856<td> 1857 <p> 1858</p> 1859<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 1860<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cmath</span><span class="special">></span> 1861<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 1862 1863<span class="keyword">long</span> <span class="identifier">lsqrt</span><span class="special">(</span><span class="keyword">long</span> <span class="identifier">x</span><span class="special">)</span> <span class="special">{</span> 1864 <span class="keyword">long</span> <span class="identifier">result</span><span class="special">;</span> 1865 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">function</span><span class="special">()</span> 1866 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 1867 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">x</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> 1868 <span class="special">})</span> 1869 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 1870 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">*</span> <span class="identifier">result</span> <span class="special"><=</span> <span class="identifier">x</span><span class="special">);</span> 1871 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">((</span><span class="identifier">result</span> <span class="special">+</span> <span class="number">1</span><span class="special">)</span> <span class="special">*</span> <span class="special">(</span><span class="identifier">result</span> <span class="special">+</span> <span class="number">1</span><span class="special">)</span> <span class="special">></span> <span class="identifier">x</span><span class="special">);</span> 1872 <span class="special">})</span> 1873 <span class="special">;</span> 1874 1875 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="keyword">long</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">sqrt</span><span class="special">(</span><span class="keyword">double</span><span class="special">(</span><span class="identifier">x</span><span class="special">)));</span> 1876<span class="special">}</span> 1877 1878<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 1879 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">lsqrt</span><span class="special">(</span><span class="number">4</span><span class="special">)</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span> 1880 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 1881<span class="special">}</span> 1882</pre> 1883<p> 1884 </p> 1885 </td> 1886<td> 1887 <p> 1888</p> 1889<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="comment">// Extra spaces, newlines, etc. for visual alignment with this library code.</span> 1890 1891 1892 1893<span class="keyword">long</span> <span class="identifier">lsqrt</span><span class="special">(</span><span class="keyword">long</span> <span class="identifier">x</span><span class="special">)</span> 1894<span class="identifier">in</span> <span class="special">{</span> 1895 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">x</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> 1896<span class="special">}</span> 1897<span class="identifier">out</span><span class="special">(</span><span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 1898 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">result</span> <span class="special">*</span> <span class="identifier">result</span> <span class="special"><=</span> <span class="identifier">x</span><span class="special">);</span> 1899 <span class="identifier">assert</span><span class="special">((</span><span class="identifier">result</span> <span class="special">+</span> <span class="number">1</span><span class="special">)</span> <span class="special">*</span> <span class="special">(</span><span class="identifier">result</span> <span class="special">+</span> <span class="number">1</span><span class="special">)</span> <span class="special">></span> <span class="identifier">x</span><span class="special">);</span> 1900<span class="special">}</span> 1901<span class="keyword">do</span> <span class="special">{</span> 1902 <span class="keyword">return</span> <span class="identifier">cast</span><span class="special">(</span><span class="keyword">long</span><span class="special">)</span><span class="identifier">std</span><span class="special">.</span><span class="identifier">math</span><span class="special">.</span><span class="identifier">sqrt</span><span class="special">(</span><span class="identifier">cast</span><span class="special">(</span><span class="identifier">real</span><span class="special">)</span><span class="identifier">x</span><span class="special">);</span> 1903<span class="special">}</span> 1904 1905 1906 1907 1908 1909 1910 1911 1912<span class="comment">// End.</span> 1913</pre> 1914<p> 1915 </p> 1916 </td> 1917</tr></tbody> 1918</table></div> 1919</div> 1920<div class="section"> 1921<div class="titlepage"><div><div><h3 class="title"> 1922<a name="boost_contract.examples.__meyer97___stack4__comparison_with_eiffel_syntax"></a><a name="Meyer97_stack4_anchor"></a><a class="link" href="examples.html#boost_contract.examples.__meyer97___stack4__comparison_with_eiffel_syntax" title="[Meyer97] Stack4: Comparison with Eiffel syntax">[Meyer97] 1923 Stack4: Comparison with Eiffel syntax</a> 1924</h3></div></div></div> 1925<div class="informaltable"><table class="table"> 1926<colgroup> 1927<col> 1928<col> 1929</colgroup> 1930<thead><tr> 1931<th> 1932 <p> 1933 This Library 1934 </p> 1935 </th> 1936<th> 1937 <p> 1938 The Eiffel Programming Language 1939 </p> 1940 </th> 1941</tr></thead> 1942<tbody> 1943<tr> 1944<td> 1945 <p> 1946</p> 1947<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="comment">// File: stack4.hpp</span> 1948<span class="preprocessor">#ifndef</span> <span class="identifier">STACK4_HPP_</span> 1949<span class="preprocessor">#define</span> <span class="identifier">STACK4_HPP_</span> 1950 1951<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 1952 1953<span class="comment">// Dispenser with LIFO access policy and fixed max capacity.</span> 1954<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 1955<span class="keyword">class</span> <span class="identifier">stack4</span> 1956 <span class="preprocessor">#define</span> <span class="identifier">BASES</span> <span class="keyword">private</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor_precondition</span><span class="special"><</span><span class="identifier">stack4</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">></span> 1957 <span class="special">:</span> <span class="identifier">BASES</span> 1958<span class="special">{</span> 1959 <span class="keyword">friend</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 1960 <span class="keyword">typedef</span> <span class="identifier">BOOST_CONTRACT_BASE_TYPES</span><span class="special">(</span><span class="identifier">BASES</span><span class="special">)</span> <span class="identifier">base_types</span><span class="special">;</span> 1961 <span class="preprocessor">#undef</span> <span class="identifier">BASES</span> 1962 1963 <span class="keyword">void</span> <span class="identifier">invariant</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 1964 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> <span class="comment">// Count non-negative.</span> 1965 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special"><=</span> <span class="identifier">capacity</span><span class="special">());</span> <span class="comment">// Count bounded.</span> 1966 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">empty</span><span class="special">()</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">));</span> <span class="comment">// Empty if no elem.</span> 1967 <span class="special">}</span> 1968 1969<span class="keyword">public</span><span class="special">:</span> 1970 <span class="comment">/* Initialization */</span> 1971 1972 <span class="comment">// Allocate static from a maximum of n elements.</span> 1973 <span class="keyword">explicit</span> <span class="identifier">stack4</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">n</span><span class="special">)</span> <span class="special">:</span> 1974 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor_precondition</span><span class="special"><</span><span class="identifier">stack4</span><span class="special">>([&]</span> <span class="special">{</span> 1975 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">n</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> <span class="comment">// Non-negative capacity.</span> 1976 <span class="special">})</span> 1977 <span class="special">{</span> 1978 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 1979 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 1980 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">n</span><span class="special">);</span> <span class="comment">// Capacity set.</span> 1981 <span class="special">})</span> 1982 <span class="special">;</span> 1983 1984 <span class="identifier">capacity_</span> <span class="special">=</span> <span class="identifier">n</span><span class="special">;</span> 1985 <span class="identifier">count_</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> 1986 <span class="identifier">array_</span> <span class="special">=</span> <span class="keyword">new</span> <span class="identifier">T</span><span class="special">[</span><span class="identifier">n</span><span class="special">];</span> 1987 <span class="special">}</span> 1988 1989 <span class="comment">// Deep copy via constructor.</span> 1990 <span class="comment">/* implicit */</span> <span class="identifier">stack4</span><span class="special">(</span><span class="identifier">stack4</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="special">{</span> 1991 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 1992 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 1993 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">());</span> 1994 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">count</span><span class="special">());</span> 1995 <span class="identifier">BOOST_CONTRACT_ASSERT_AXIOM</span><span class="special">(*</span><span class="keyword">this</span> <span class="special">==</span> <span class="identifier">other</span><span class="special">);</span> 1996 <span class="special">})</span> 1997 <span class="special">;</span> 1998 1999 <span class="identifier">capacity_</span> <span class="special">=</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">capacity_</span><span class="special">;</span> 2000 <span class="identifier">count_</span> <span class="special">=</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">count_</span><span class="special">;</span> 2001 <span class="identifier">array_</span> <span class="special">=</span> <span class="keyword">new</span> <span class="identifier">T</span><span class="special">[</span><span class="identifier">other</span><span class="special">.</span><span class="identifier">capacity_</span><span class="special">];</span> 2002 <span class="keyword">for</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">count_</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="identifier">array_</span><span class="special">[</span><span class="identifier">i</span><span class="special">]</span> <span class="special">=</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">array_</span><span class="special">[</span><span class="identifier">i</span><span class="special">];</span> 2003 <span class="special">}</span> 2004 2005 <span class="comment">// Deep copy via assignment.</span> 2006 <span class="identifier">stack4</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">=(</span><span class="identifier">stack4</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">other</span><span class="special">)</span> <span class="special">{</span> 2007 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2008 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2009 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">());</span> 2010 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">count</span><span class="special">());</span> 2011 <span class="identifier">BOOST_CONTRACT_ASSERT_AXIOM</span><span class="special">(*</span><span class="keyword">this</span> <span class="special">==</span> <span class="identifier">other</span><span class="special">);</span> 2012 <span class="special">})</span> 2013 <span class="special">;</span> 2014 2015 <span class="keyword">delete</span><span class="special">[]</span> <span class="identifier">array_</span><span class="special">;</span> 2016 <span class="identifier">capacity_</span> <span class="special">=</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">capacity_</span><span class="special">;</span> 2017 <span class="identifier">count_</span> <span class="special">=</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">count_</span><span class="special">;</span> 2018 <span class="identifier">array_</span> <span class="special">=</span> <span class="keyword">new</span> <span class="identifier">T</span><span class="special">[</span><span class="identifier">other</span><span class="special">.</span><span class="identifier">capacity_</span><span class="special">];</span> 2019 <span class="keyword">for</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">count_</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="identifier">array_</span><span class="special">[</span><span class="identifier">i</span><span class="special">]</span> <span class="special">=</span> <span class="identifier">other</span><span class="special">.</span><span class="identifier">array_</span><span class="special">[</span><span class="identifier">i</span><span class="special">];</span> 2020 <span class="keyword">return</span> <span class="special">*</span><span class="keyword">this</span><span class="special">;</span> 2021 <span class="special">}</span> 2022 2023 <span class="comment">// Destroy this stack.</span> 2024 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">stack4</span><span class="special">()</span> <span class="special">{</span> 2025 <span class="comment">// Check invariants.</span> 2026 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 2027 <span class="keyword">delete</span><span class="special">[]</span> <span class="identifier">array_</span><span class="special">;</span> 2028 <span class="special">}</span> 2029 2030 <span class="comment">/* Access */</span> 2031 2032 <span class="comment">// Max number of stack elements.</span> 2033 <span class="keyword">int</span> <span class="identifier">capacity</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2034 <span class="comment">// Check invariants.</span> 2035 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 2036 <span class="keyword">return</span> <span class="identifier">capacity_</span><span class="special">;</span> 2037 <span class="special">}</span> 2038 2039 <span class="comment">// Number of stack elements.</span> 2040 <span class="keyword">int</span> <span class="identifier">count</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2041 <span class="comment">// Check invariants.</span> 2042 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 2043 <span class="keyword">return</span> <span class="identifier">count_</span><span class="special">;</span> 2044 <span class="special">}</span> 2045 2046 <span class="comment">// Top element.</span> 2047 <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">item</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2048 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2049 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 2050 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">());</span> <span class="comment">// Not empty (i.e., count > 0).</span> 2051 <span class="special">})</span> 2052 <span class="special">;</span> 2053 2054 <span class="keyword">return</span> <span class="identifier">array_</span><span class="special">[</span><span class="identifier">count_</span> <span class="special">-</span> <span class="number">1</span><span class="special">];</span> 2055 <span class="special">}</span> 2056 2057 <span class="comment">/* Status Report */</span> 2058 2059 <span class="comment">// Is stack empty?</span> 2060 <span class="keyword">bool</span> <span class="identifier">empty</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2061 <span class="keyword">bool</span> <span class="identifier">result</span><span class="special">;</span> 2062 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2063 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2064 <span class="comment">// Empty definition.</span> 2065 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">));</span> 2066 <span class="special">})</span> 2067 <span class="special">;</span> 2068 2069 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">count_</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span> 2070 <span class="special">}</span> 2071 2072 <span class="comment">// Is stack full?</span> 2073 <span class="keyword">bool</span> <span class="identifier">full</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2074 <span class="keyword">bool</span> <span class="identifier">result</span><span class="special">;</span> 2075 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2076 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2077 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span> <span class="comment">// Full definition.</span> 2078 <span class="identifier">result</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">capacity</span><span class="special">()));</span> 2079 <span class="special">})</span> 2080 <span class="special">;</span> 2081 2082 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">count_</span> <span class="special">==</span> <span class="identifier">capacity_</span><span class="special">);</span> 2083 <span class="special">}</span> 2084 2085 <span class="comment">/* Element Change */</span> 2086 2087 <span class="comment">// Add x on top.</span> 2088 <span class="keyword">void</span> <span class="identifier">put</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">x</span><span class="special">)</span> <span class="special">{</span> 2089 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">old_count</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">count</span><span class="special">());</span> 2090 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2091 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 2092 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">full</span><span class="special">());</span> <span class="comment">// Not full.</span> 2093 <span class="special">})</span> 2094 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2095 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">());</span> <span class="comment">// Not empty.</span> 2096 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">item</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">x</span><span class="special">);</span> <span class="comment">// Added to top.</span> 2097 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_count</span> <span class="special">+</span> <span class="number">1</span><span class="special">);</span> <span class="comment">// One more.</span> 2098 <span class="special">})</span> 2099 <span class="special">;</span> 2100 2101 <span class="identifier">array_</span><span class="special">[</span><span class="identifier">count_</span><span class="special">++]</span> <span class="special">=</span> <span class="identifier">x</span><span class="special">;</span> 2102 <span class="special">}</span> 2103 2104 <span class="comment">// Remove top element.</span> 2105 <span class="keyword">void</span> <span class="identifier">remove</span><span class="special">()</span> <span class="special">{</span> 2106 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">old_count</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">count</span><span class="special">());</span> 2107 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2108 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 2109 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">());</span> <span class="comment">// Not empty (i.e., count > 0).</span> 2110 <span class="special">})</span> 2111 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2112 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">full</span><span class="special">());</span> <span class="comment">// Not full.</span> 2113 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_count</span> <span class="special">-</span> <span class="number">1</span><span class="special">);</span> <span class="comment">// One less.</span> 2114 <span class="special">})</span> 2115 <span class="special">;</span> 2116 2117 <span class="special">--</span><span class="identifier">count_</span><span class="special">;</span> 2118 <span class="special">}</span> 2119 2120 <span class="comment">/* Friend Helpers */</span> 2121 2122 <span class="keyword">friend</span> <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">==(</span><span class="identifier">stack4</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">left</span><span class="special">,</span> <span class="identifier">stack4</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">right</span><span class="special">)</span> <span class="special">{</span> 2123 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">inv1</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(&</span><span class="identifier">left</span><span class="special">);</span> 2124 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">inv2</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(&</span><span class="identifier">right</span><span class="special">);</span> 2125 <span class="keyword">if</span><span class="special">(</span><span class="identifier">left</span><span class="special">.</span><span class="identifier">count_</span> <span class="special">!=</span> <span class="identifier">right</span><span class="special">.</span><span class="identifier">count_</span><span class="special">)</span> <span class="keyword">return</span> <span class="keyword">false</span><span class="special">;</span> 2126 <span class="keyword">for</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">left</span><span class="special">.</span><span class="identifier">count_</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="special">{</span> 2127 <span class="keyword">if</span><span class="special">(</span><span class="identifier">left</span><span class="special">.</span><span class="identifier">array_</span><span class="special">[</span><span class="identifier">i</span><span class="special">]</span> <span class="special">!=</span> <span class="identifier">right</span><span class="special">.</span><span class="identifier">array_</span><span class="special">[</span><span class="identifier">i</span><span class="special">])</span> <span class="keyword">return</span> <span class="keyword">false</span><span class="special">;</span> 2128 <span class="special">}</span> 2129 <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span> 2130 <span class="special">}</span> 2131 2132<span class="keyword">private</span><span class="special">:</span> 2133 <span class="keyword">int</span> <span class="identifier">capacity_</span><span class="special">;</span> 2134 <span class="keyword">int</span> <span class="identifier">count_</span><span class="special">;</span> 2135 <span class="identifier">T</span><span class="special">*</span> <span class="identifier">array_</span><span class="special">;</span> <span class="comment">// Internally use C-style array.</span> 2136<span class="special">};</span> 2137 2138<span class="preprocessor">#endif</span> <span class="comment">// #include guard</span> 2139</pre> 2140<p> 2141 </p> 2142 </td> 2143<td> 2144 <p> 2145</p> 2146<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="special">--</span> <span class="identifier">Extra</span> <span class="identifier">spaces</span><span class="special">,</span> <span class="identifier">newlines</span><span class="special">,</span> <span class="identifier">etc</span><span class="special">.</span> <span class="keyword">for</span> <span class="identifier">visual</span> <span class="identifier">alignment</span> <span class="identifier">with</span> <span class="keyword">this</span> <span class="identifier">library</span> <span class="identifier">code</span><span class="special">.</span> 2147 2148 2149 2150 2151 2152<span class="identifier">indexing</span> 2153 <span class="identifier">destription</span><span class="special">:</span> <span class="string">"Dispenser with LIFO access policy and a fixed max capacity."</span> 2154<span class="keyword">class</span> <span class="identifier">interface</span> <span class="identifier">STACK4</span><span class="special">[</span><span class="identifier">G</span><span class="special">]</span> <span class="identifier">creation</span> <span class="identifier">make</span> <span class="special">--</span> <span class="identifier">Interface</span> <span class="identifier">only</span> <span class="special">(</span><span class="identifier">no</span> <span class="identifier">implementation</span><span class="special">).</span> 2155 2156 2157 2158 2159 2160 2161 2162<span class="identifier">invariant</span> 2163 <span class="identifier">count_non_negative</span><span class="special">:</span> <span class="identifier">count</span> <span class="special">>=</span> <span class="number">0</span> 2164 <span class="identifier">count_bounded</span><span class="special">:</span> <span class="identifier">count</span> <span class="special"><=</span> <span class="identifier">capacity</span> 2165 <span class="identifier">empty_if_no_elements</span><span class="special">:</span> <span class="identifier">empty</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">count</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> 2166 2167 2168 2169<span class="identifier">feature</span> <span class="special">--</span> <span class="identifier">Initialization</span> 2170 2171 <span class="special">--</span> <span class="identifier">Allocate</span> <span class="identifier">stack</span> <span class="keyword">for</span> <span class="identifier">a</span> <span class="identifier">maximum</span> <span class="identifier">of</span> <span class="identifier">n</span> <span class="identifier">elements</span><span class="special">.</span> 2172 <span class="identifier">make</span><span class="special">(</span><span class="identifier">n</span><span class="special">:</span> <span class="identifier">INTEGER</span><span class="special">)</span> <span class="identifier">is</span> 2173 <span class="identifier">require</span> 2174 <span class="identifier">non_negative_capacity</span><span class="special">:</span> <span class="identifier">n</span> <span class="special">>=</span> <span class="number">0</span> 2175 <span class="identifier">ensure</span> 2176 <span class="identifier">capacity_set</span><span class="special">:</span> <span class="identifier">capacity</span> <span class="special">=</span> <span class="identifier">n</span> 2177 <span class="identifier">end</span> 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229<span class="identifier">feature</span> <span class="special">--</span> <span class="identifier">Access</span> 2230 2231 <span class="special">--</span> <span class="identifier">Max</span> <span class="identifier">number</span> <span class="identifier">of</span> <span class="identifier">stack</span> <span class="identifier">elements</span><span class="special">.</span> 2232 <span class="identifier">capacity</span><span class="special">:</span> <span class="identifier">INTEGER</span> 2233 2234 2235 2236 2237 2238 <span class="special">--</span> <span class="identifier">Number</span> <span class="identifier">of</span> <span class="identifier">stack</span> <span class="identifier">elements</span><span class="special">.</span> 2239 <span class="identifier">count</span><span class="special">:</span> <span class="identifier">INTEGER</span> 2240 2241 2242 2243 2244 2245 <span class="special">--</span> <span class="identifier">Top</span> <span class="identifier">element</span><span class="special">.</span> 2246 <span class="identifier">item</span><span class="special">:</span> <span class="identifier">G</span> <span class="identifier">is</span> 2247 <span class="identifier">require</span> 2248 <span class="identifier">not_empty</span><span class="special">:</span> <span class="keyword">not</span> <span class="identifier">empty</span> <span class="special">--</span> <span class="identifier">i</span><span class="special">.</span><span class="identifier">e</span><span class="special">.,</span> <span class="identifier">count</span> <span class="special">></span> <span class="number">0</span> 2249 <span class="identifier">end</span> 2250 2251 2252 2253 2254 2255 2256<span class="identifier">feature</span> <span class="special">--</span> <span class="identifier">Status</span> <span class="identifier">report</span> 2257 2258 <span class="special">--</span> <span class="identifier">Is</span> <span class="identifier">stack</span> <span class="identifier">empty</span><span class="special">?</span> 2259 <span class="identifier">empty</span><span class="special">:</span> <span class="identifier">BOOLEAN</span> <span class="identifier">is</span> 2260 <span class="identifier">ensure</span> 2261 <span class="identifier">empty_definition</span><span class="special">:</span> <span class="identifier">result</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">count</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> 2262 <span class="identifier">end</span> 2263 2264 2265 2266 2267 2268 2269 2270 2271 <span class="special">--</span> <span class="identifier">Is</span> <span class="identifier">stack</span> <span class="identifier">full</span><span class="special">?</span> 2272 <span class="identifier">full</span><span class="special">:</span> <span class="identifier">BOOLEAN</span> <span class="identifier">is</span> 2273 <span class="identifier">ensure</span> 2274 <span class="identifier">full_definition</span><span class="special">:</span> <span class="identifier">result</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">count</span> <span class="special">=</span> <span class="identifier">capacity</span><span class="special">)</span> 2275 <span class="identifier">end</span> 2276 2277 2278 2279 2280 2281 2282 2283 2284<span class="identifier">feature</span> <span class="special">--</span> <span class="identifier">Element</span> <span class="identifier">change</span> 2285 2286 <span class="special">--</span> <span class="identifier">Add</span> <span class="identifier">x</span> <span class="identifier">on</span> <span class="identifier">top</span><span class="special">.</span> 2287 <span class="identifier">put</span><span class="special">(</span><span class="identifier">x</span><span class="special">:</span> <span class="identifier">G</span><span class="special">)</span> <span class="identifier">is</span> 2288 <span class="identifier">require</span> 2289 <span class="identifier">not_full</span><span class="special">:</span> <span class="keyword">not</span> <span class="identifier">full</span> 2290 <span class="identifier">ensure</span> 2291 <span class="identifier">not_empty</span><span class="special">:</span> <span class="keyword">not</span> <span class="identifier">empty</span> 2292 <span class="identifier">added_to_top</span><span class="special">:</span> <span class="identifier">item</span> <span class="special">=</span> <span class="identifier">x</span> 2293 <span class="identifier">one_more_item</span><span class="special">:</span> <span class="identifier">count</span> <span class="special">=</span> <span class="identifier">old</span> <span class="identifier">count</span> <span class="special">+</span> <span class="number">1</span> 2294 <span class="identifier">end</span> 2295 2296 2297 2298 2299 2300 2301 2302 2303 <span class="special">--</span> <span class="identifier">Remove</span> <span class="identifier">top</span> <span class="identifier">element</span><span class="special">.</span> 2304 <span class="identifier">remove</span> <span class="identifier">is</span> 2305 <span class="identifier">require</span> 2306 <span class="identifier">not_empty</span><span class="special">:</span> <span class="keyword">not</span> <span class="identifier">empty</span> <span class="special">--</span> <span class="identifier">i</span><span class="special">.</span><span class="identifier">e</span><span class="special">.,</span> <span class="identifier">count</span> <span class="special">></span> <span class="number">0</span> 2307 <span class="identifier">ensure</span> 2308 <span class="identifier">not_full</span><span class="special">:</span> <span class="keyword">not</span> <span class="identifier">full</span> 2309 <span class="identifier">one_fewer_item</span><span class="special">:</span> <span class="identifier">count</span> <span class="special">=</span> <span class="identifier">old</span> <span class="identifier">count</span> <span class="special">-</span> <span class="number">1</span> 2310 2311 <span class="identifier">end</span> 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335<span class="identifier">end</span> <span class="special">--</span> <span class="keyword">class</span> <span class="identifier">interface</span> <span class="identifier">STACK4</span> 2336 2337<span class="special">--</span> <span class="identifier">End</span><span class="special">.</span> 2338</pre> 2339<p> 2340 </p> 2341 </td> 2342</tr> 2343<tr> 2344<td> 2345 <p> 2346</p> 2347<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#include</span> <span class="string">"stack4.hpp"</span> 2348<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 2349 2350<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 2351 <span class="identifier">stack4</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">s</span><span class="special">(</span><span class="number">3</span><span class="special">);</span> 2352 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="number">3</span><span class="special">);</span> 2353 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span> 2354 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">empty</span><span class="special">());</span> 2355 <span class="identifier">assert</span><span class="special">(!</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">full</span><span class="special">());</span> 2356 2357 <span class="identifier">s</span><span class="special">.</span><span class="identifier">put</span><span class="special">(</span><span class="number">123</span><span class="special">);</span> 2358 <span class="identifier">assert</span><span class="special">(!</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">empty</span><span class="special">());</span> 2359 <span class="identifier">assert</span><span class="special">(!</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">full</span><span class="special">());</span> 2360 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">item</span><span class="special">()</span> <span class="special">==</span> <span class="number">123</span><span class="special">);</span> 2361 2362 <span class="identifier">s</span><span class="special">.</span><span class="identifier">remove</span><span class="special">();</span> 2363 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">empty</span><span class="special">());</span> 2364 <span class="identifier">assert</span><span class="special">(!</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">full</span><span class="special">());</span> 2365 2366 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 2367<span class="special">}</span> 2368</pre> 2369<p> 2370 </p> 2371 </td> 2372<td> 2373 </td> 2374</tr> 2375</tbody> 2376</table></div> 2377</div> 2378<div class="section"> 2379<div class="titlepage"><div><div><h3 class="title"> 2380<a name="boost_contract.examples.__meyer97___stack3__error_codes_instead_of_preconditions"></a><a class="link" href="examples.html#boost_contract.examples.__meyer97___stack3__error_codes_instead_of_preconditions" title="[Meyer97] Stack3: Error codes instead of preconditions">[Meyer97] 2381 Stack3: Error codes instead of preconditions</a> 2382</h3></div></div></div> 2383<p> 2384</p> 2385<pre class="programlisting"><span class="comment">// File: stack3.cpp</span> 2386<span class="preprocessor">#include</span> <span class="string">"stack4.hpp"</span> 2387<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 2388<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">optional</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 2389<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 2390 2391<span class="comment">// Dispenser LIFO with max capacity using error codes.</span> 2392<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 2393<span class="keyword">class</span> <span class="identifier">stack3</span> <span class="special">{</span> 2394 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 2395 2396 <span class="keyword">void</span> <span class="identifier">invariant</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2397 <span class="keyword">if</span><span class="special">(!</span><span class="identifier">error</span><span class="special">())</span> <span class="special">{</span> 2398 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> <span class="comment">// Count non-negative.</span> 2399 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special"><=</span> <span class="identifier">capacity</span><span class="special">());</span> <span class="comment">// Count bounded.</span> 2400 <span class="comment">// Empty if no element.</span> 2401 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">empty</span><span class="special">()</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">));</span> 2402 <span class="special">}</span> 2403 <span class="special">}</span> 2404 2405<span class="keyword">public</span><span class="special">:</span> 2406 <span class="keyword">enum</span> <span class="identifier">error_code</span> <span class="special">{</span> 2407 <span class="identifier">no_error</span> <span class="special">=</span> <span class="number">0</span><span class="special">,</span> 2408 <span class="identifier">overflow_error</span><span class="special">,</span> 2409 <span class="identifier">underflow_error</span><span class="special">,</span> 2410 <span class="identifier">size_error</span> 2411 <span class="special">};</span> 2412 2413 <span class="comment">/* Initialization */</span> 2414 2415 <span class="comment">// Create stack for max of n elems, if n < 0 set error (no preconditions).</span> 2416 <span class="keyword">explicit</span> <span class="identifier">stack3</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">n</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">default_value</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">())</span> <span class="special">:</span> 2417 <span class="identifier">stack_</span><span class="special">(</span><span class="number">0</span><span class="special">),</span> <span class="identifier">error_</span><span class="special">(</span><span class="identifier">no_error</span><span class="special">)</span> <span class="special">{</span> 2418 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2419 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2420 <span class="comment">// Error if impossible.</span> 2421 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">((</span><span class="identifier">n</span> <span class="special"><</span> <span class="number">0</span><span class="special">)</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">error</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">size_error</span><span class="special">));</span> 2422 <span class="comment">// No error if possible.</span> 2423 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">((</span><span class="identifier">n</span> <span class="special">>=</span> <span class="number">0</span><span class="special">)</span> <span class="special">==</span> <span class="special">!</span><span class="identifier">error</span><span class="special">());</span> 2424 <span class="comment">// Created if no error.</span> 2425 <span class="keyword">if</span><span class="special">(!</span><span class="identifier">error</span><span class="special">())</span> <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">n</span><span class="special">);</span> 2426 <span class="special">})</span> 2427 <span class="special">;</span> 2428 2429 <span class="keyword">if</span><span class="special">(</span><span class="identifier">n</span> <span class="special">>=</span> <span class="number">0</span><span class="special">)</span> <span class="identifier">stack_</span> <span class="special">=</span> <span class="identifier">stack4</span><span class="special"><</span><span class="identifier">T</span><span class="special">>(</span><span class="identifier">n</span><span class="special">);</span> 2430 <span class="keyword">else</span> <span class="identifier">error_</span> <span class="special">=</span> <span class="identifier">size_error</span><span class="special">;</span> 2431 <span class="special">}</span> 2432 2433 <span class="comment">/* Access */</span> 2434 2435 <span class="comment">// Max number of stack elements.</span> 2436 <span class="keyword">int</span> <span class="identifier">capacity</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2437 <span class="comment">// Check invariants.</span> 2438 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 2439 <span class="keyword">return</span> <span class="identifier">stack_</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">();</span> 2440 <span class="special">}</span> 2441 2442 <span class="comment">// Number of stack elements.</span> 2443 <span class="keyword">int</span> <span class="identifier">count</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2444 <span class="comment">// Check invariants.</span> 2445 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 2446 <span class="keyword">return</span> <span class="identifier">stack_</span><span class="special">.</span><span class="identifier">count</span><span class="special">();</span> 2447 <span class="special">}</span> 2448 2449 <span class="comment">// Top element if present, otherwise none and set error (no preconditions).</span> 2450 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&></span> <span class="identifier">item</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2451 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2452 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2453 <span class="comment">// Error if impossible.</span> 2454 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">empty</span><span class="special">()</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">error</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">underflow_error</span><span class="special">));</span> 2455 <span class="comment">// No error if possible.</span> 2456 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">()</span> <span class="special">==</span> <span class="special">!</span><span class="identifier">error</span><span class="special">());</span> 2457 <span class="special">})</span> 2458 <span class="special">;</span> 2459 2460 <span class="keyword">if</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">())</span> <span class="special">{</span> 2461 <span class="identifier">error_</span> <span class="special">=</span> <span class="identifier">no_error</span><span class="special">;</span> 2462 <span class="keyword">return</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&>(</span><span class="identifier">stack_</span><span class="special">.</span><span class="identifier">item</span><span class="special">());</span> 2463 <span class="special">}</span> <span class="keyword">else</span> <span class="special">{</span> 2464 <span class="identifier">error_</span> <span class="special">=</span> <span class="identifier">underflow_error</span><span class="special">;</span> 2465 <span class="keyword">return</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&>();</span> 2466 <span class="special">}</span> 2467 <span class="special">}</span> 2468 2469 <span class="comment">/* Status Report */</span> 2470 2471 <span class="comment">// Error indicator set by various operations.</span> 2472 <span class="identifier">error_code</span> <span class="identifier">error</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2473 <span class="comment">// Check invariants.</span> 2474 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 2475 <span class="keyword">return</span> <span class="identifier">error_</span><span class="special">;</span> 2476 <span class="special">}</span> 2477 2478 <span class="keyword">bool</span> <span class="identifier">empty</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2479 <span class="comment">// Check invariants.</span> 2480 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 2481 <span class="keyword">return</span> <span class="identifier">stack_</span><span class="special">.</span><span class="identifier">empty</span><span class="special">();</span> 2482 <span class="special">}</span> 2483 2484 <span class="keyword">bool</span> <span class="identifier">full</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2485 <span class="comment">// Check invariants.</span> 2486 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 2487 <span class="keyword">return</span> <span class="identifier">stack_</span><span class="special">.</span><span class="identifier">full</span><span class="special">();</span> 2488 <span class="special">}</span> 2489 2490 <span class="comment">/* Element Change */</span> 2491 2492 <span class="comment">// Add x to top if capacity allows, otherwise set error (no preconditions).</span> 2493 <span class="keyword">void</span> <span class="identifier">put</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">x</span><span class="special">)</span> <span class="special">{</span> 2494 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">bool</span><span class="special">></span> <span class="identifier">old_full</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">full</span><span class="special">());</span> 2495 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">old_count</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">count</span><span class="special">());</span> 2496 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2497 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2498 <span class="comment">// Error if impossible.</span> 2499 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(*</span><span class="identifier">old_full</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">error</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">overflow_error</span><span class="special">));</span> 2500 <span class="comment">// No error if possible.</span> 2501 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!*</span><span class="identifier">old_full</span> <span class="special">==</span> <span class="special">!</span><span class="identifier">error</span><span class="special">());</span> 2502 <span class="keyword">if</span><span class="special">(!</span><span class="identifier">error</span><span class="special">())</span> <span class="special">{</span> <span class="comment">// If no error...</span> 2503 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">());</span> <span class="comment">// ...not empty.</span> 2504 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(*</span><span class="identifier">item</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">x</span><span class="special">);</span> <span class="comment">// ...added to top.</span> 2505 <span class="comment">// ...one more.</span> 2506 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_count</span> <span class="special">+</span> <span class="number">1</span><span class="special">);</span> 2507 <span class="special">}</span> 2508 <span class="special">})</span> 2509 <span class="special">;</span> 2510 2511 <span class="keyword">if</span><span class="special">(</span><span class="identifier">full</span><span class="special">())</span> <span class="identifier">error_</span> <span class="special">=</span> <span class="identifier">overflow_error</span><span class="special">;</span> 2512 <span class="keyword">else</span> <span class="special">{</span> 2513 <span class="identifier">stack_</span><span class="special">.</span><span class="identifier">put</span><span class="special">(</span><span class="identifier">x</span><span class="special">);</span> 2514 <span class="identifier">error_</span> <span class="special">=</span> <span class="identifier">no_error</span><span class="special">;</span> 2515 <span class="special">}</span> 2516 <span class="special">}</span> 2517 2518 <span class="comment">// Remove top element if possible, otherwise set error (no preconditions).</span> 2519 <span class="keyword">void</span> <span class="identifier">remove</span><span class="special">()</span> <span class="special">{</span> 2520 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">bool</span><span class="special">></span> <span class="identifier">old_empty</span> <span class="special">=</span> 2521 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">empty</span><span class="special">());</span> 2522 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">old_count</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">count</span><span class="special">());</span> 2523 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2524 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2525 <span class="comment">// Error if impossible.</span> 2526 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(*</span><span class="identifier">old_empty</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">error</span><span class="special">()</span> <span class="special">==</span> 2527 <span class="identifier">underflow_error</span><span class="special">));</span> 2528 <span class="comment">// No error if possible.</span> 2529 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!*</span><span class="identifier">old_empty</span> <span class="special">==</span> <span class="special">!</span><span class="identifier">error</span><span class="special">());</span> 2530 <span class="keyword">if</span><span class="special">(!</span><span class="identifier">error</span><span class="special">())</span> <span class="special">{</span> <span class="comment">// If no error...</span> 2531 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">full</span><span class="special">());</span> <span class="comment">// ...not full.</span> 2532 <span class="comment">// ...one less.</span> 2533 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_count</span> <span class="special">-</span> <span class="number">1</span><span class="special">);</span> 2534 <span class="special">}</span> 2535 <span class="special">})</span> 2536 <span class="special">;</span> 2537 2538 <span class="keyword">if</span><span class="special">(</span><span class="identifier">empty</span><span class="special">())</span> <span class="identifier">error_</span> <span class="special">=</span> <span class="identifier">underflow_error</span><span class="special">;</span> 2539 <span class="keyword">else</span> <span class="special">{</span> 2540 <span class="identifier">stack_</span><span class="special">.</span><span class="identifier">remove</span><span class="special">();</span> 2541 <span class="identifier">error_</span> <span class="special">=</span> <span class="identifier">no_error</span><span class="special">;</span> 2542 <span class="special">}</span> 2543 <span class="special">}</span> 2544 2545<span class="keyword">private</span><span class="special">:</span> 2546 <span class="identifier">stack4</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="identifier">stack_</span><span class="special">;</span> 2547 <span class="keyword">mutable</span> <span class="identifier">error_code</span> <span class="identifier">error_</span><span class="special">;</span> 2548<span class="special">};</span> 2549 2550<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 2551 <span class="identifier">stack3</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">s</span><span class="special">(</span><span class="number">3</span><span class="special">);</span> 2552 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="number">3</span><span class="special">);</span> 2553 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span> 2554 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">empty</span><span class="special">());</span> 2555 <span class="identifier">assert</span><span class="special">(!</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">full</span><span class="special">());</span> 2556 2557 <span class="identifier">s</span><span class="special">.</span><span class="identifier">put</span><span class="special">(</span><span class="number">123</span><span class="special">);</span> 2558 <span class="identifier">assert</span><span class="special">(!</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">empty</span><span class="special">());</span> 2559 <span class="identifier">assert</span><span class="special">(!</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">full</span><span class="special">());</span> 2560 <span class="identifier">assert</span><span class="special">(*</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">item</span><span class="special">()</span> <span class="special">==</span> <span class="number">123</span><span class="special">);</span> 2561 2562 <span class="identifier">s</span><span class="special">.</span><span class="identifier">remove</span><span class="special">();</span> 2563 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">empty</span><span class="special">());</span> 2564 <span class="identifier">assert</span><span class="special">(!</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">full</span><span class="special">());</span> 2565 2566 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 2567<span class="special">}</span> 2568</pre> 2569<p> 2570 </p> 2571</div> 2572<div class="section"> 2573<div class="titlepage"><div><div><h3 class="title"> 2574<a name="boost_contract.examples.__mitchell02___name_list__relaxed_subcontracts"></a><a class="link" href="examples.html#boost_contract.examples.__mitchell02___name_list__relaxed_subcontracts" title="[Mitchell02] Name List: Relaxed subcontracts">[Mitchell02] 2575 Name List: Relaxed subcontracts</a> 2576</h3></div></div></div> 2577<p> 2578</p> 2579<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 2580<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">string</span><span class="special">></span> 2581<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">vector</span><span class="special">></span> 2582<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">algorithm</span><span class="special">></span> 2583<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 2584 2585<span class="comment">// List of names.</span> 2586<span class="keyword">class</span> <span class="identifier">name_list</span> <span class="special">{</span> 2587 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 2588 2589 <span class="keyword">void</span> <span class="identifier">invariant</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2590 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> <span class="comment">// Non-negative count.</span> 2591 <span class="special">}</span> 2592 2593<span class="keyword">public</span><span class="special">:</span> 2594 <span class="comment">/* Creation */</span> 2595 2596 <span class="comment">// Create an empty list.</span> 2597 <span class="identifier">name_list</span><span class="special">()</span> <span class="special">{</span> 2598 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2599 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2600 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span> <span class="comment">// Empty list.</span> 2601 <span class="special">})</span> 2602 <span class="special">;</span> 2603 <span class="special">}</span> 2604 2605 <span class="comment">// Destroy list.</span> 2606 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">name_list</span><span class="special">()</span> <span class="special">{</span> 2607 <span class="comment">// Check invariants.</span> 2608 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 2609 <span class="special">}</span> 2610 2611 <span class="comment">/* Basic Queries */</span> 2612 2613 <span class="comment">// Number of names in list.</span> 2614 <span class="keyword">int</span> <span class="identifier">count</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2615 <span class="comment">// Check invariants.</span> 2616 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 2617 <span class="keyword">return</span> <span class="identifier">names_</span><span class="special">.</span><span class="identifier">size</span><span class="special">();</span> 2618 <span class="special">}</span> 2619 2620 <span class="comment">// Is name in list?</span> 2621 <span class="keyword">bool</span> <span class="identifier">has</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">name</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> 2622 <span class="keyword">bool</span> <span class="identifier">result</span><span class="special">;</span> 2623 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2624 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2625 <span class="comment">// If empty, has not.</span> 2626 <span class="keyword">if</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">)</span> <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">result</span><span class="special">);</span> 2627 <span class="special">})</span> 2628 <span class="special">;</span> 2629 2630 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">names_</span><span class="special">.</span><span class="identifier">cend</span><span class="special">()</span> <span class="special">!=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">find</span><span class="special">(</span><span class="identifier">names_</span><span class="special">.</span><span class="identifier">cbegin</span><span class="special">(),</span> 2631 <span class="identifier">names_</span><span class="special">.</span><span class="identifier">cend</span><span class="special">(),</span> <span class="identifier">name</span><span class="special">);</span> 2632 <span class="special">}</span> 2633 2634 <span class="comment">/* Commands */</span> 2635 2636 <span class="comment">// Add name to list, if name not already in list.</span> 2637 <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">put</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">name</span><span class="special">,</span> 2638 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="special">{</span> 2639 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">bool</span><span class="special">></span> <span class="identifier">old_has_name</span> <span class="special">=</span> 2640 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">has</span><span class="special">(</span><span class="identifier">name</span><span class="special">));</span> 2641 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">old_count</span> <span class="special">=</span> 2642 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">count</span><span class="special">());</span> 2643 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="keyword">this</span><span class="special">)</span> 2644 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 2645 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">has</span><span class="special">(</span><span class="identifier">name</span><span class="special">));</span> <span class="comment">// Not already in list.</span> 2646 <span class="special">})</span> 2647 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2648 <span class="keyword">if</span><span class="special">(!*</span><span class="identifier">old_has_name</span><span class="special">)</span> <span class="special">{</span> <span class="comment">// If-guard allows to relax subcontracts.</span> 2649 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">has</span><span class="special">(</span><span class="identifier">name</span><span class="special">));</span> <span class="comment">// Name in list.</span> 2650 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_count</span> <span class="special">+</span> <span class="number">1</span><span class="special">);</span> <span class="comment">// Inc.</span> 2651 <span class="special">}</span> 2652 <span class="special">})</span> 2653 <span class="special">;</span> 2654 2655 <span class="identifier">names_</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">name</span><span class="special">);</span> 2656 <span class="special">}</span> 2657 2658<span class="keyword">private</span><span class="special">:</span> 2659 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">></span> <span class="identifier">names_</span><span class="special">;</span> 2660<span class="special">};</span> 2661 2662<span class="keyword">class</span> <span class="identifier">relaxed_name_list</span> 2663 <span class="preprocessor">#define</span> <span class="identifier">BASES</span> <span class="keyword">public</span> <span class="identifier">name_list</span> 2664 <span class="special">:</span> <span class="identifier">BASES</span> 2665<span class="special">{</span> 2666 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 2667 2668 <span class="keyword">typedef</span> <span class="identifier">BOOST_CONTRACT_BASE_TYPES</span><span class="special">(</span><span class="identifier">BASES</span><span class="special">)</span> <span class="identifier">base_types</span><span class="special">;</span> <span class="comment">// Subcontracting.</span> 2669 <span class="preprocessor">#undef</span> <span class="identifier">BASES</span> 2670 2671 <span class="identifier">BOOST_CONTRACT_OVERRIDE</span><span class="special">(</span><span class="identifier">put</span><span class="special">);</span> 2672 2673<span class="keyword">public</span><span class="special">:</span> 2674 <span class="comment">/* Commands */</span> 2675 2676 <span class="comment">// Add name to list, or do nothing if name already in list (relaxed).</span> 2677 <span class="keyword">void</span> <span class="identifier">put</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">name</span><span class="special">,</span> 2678 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="comment">/* override */</span> <span class="special">{</span> 2679 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">bool</span><span class="special">></span> <span class="identifier">old_has_name</span> <span class="special">=</span> 2680 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">has</span><span class="special">(</span><span class="identifier">name</span><span class="special">));</span> 2681 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">old_count</span> <span class="special">=</span> 2682 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">count</span><span class="special">());</span> 2683 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special"><</span> 2684 <span class="identifier">override_put</span><span class="special">>(</span><span class="identifier">v</span><span class="special">,</span> <span class="special">&</span><span class="identifier">relaxed_name_list</span><span class="special">::</span><span class="identifier">put</span><span class="special">,</span> <span class="keyword">this</span><span class="special">,</span> <span class="identifier">name</span><span class="special">)</span> 2685 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> <span class="comment">// Relax inherited preconditions.</span> 2686 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">has</span><span class="special">(</span><span class="identifier">name</span><span class="special">));</span> <span class="comment">// Already in list.</span> 2687 <span class="special">})</span> 2688 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> <span class="comment">// Inherited post. not checked given if-guard.</span> 2689 <span class="keyword">if</span><span class="special">(*</span><span class="identifier">old_has_name</span><span class="special">)</span> <span class="special">{</span> 2690 <span class="comment">// Count unchanged if name already in list.</span> 2691 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_count</span><span class="special">);</span> 2692 <span class="special">}</span> 2693 <span class="special">})</span> 2694 <span class="special">;</span> 2695 2696 <span class="keyword">if</span><span class="special">(!</span><span class="identifier">has</span><span class="special">(</span><span class="identifier">name</span><span class="special">))</span> <span class="identifier">name_list</span><span class="special">::</span><span class="identifier">put</span><span class="special">(</span><span class="identifier">name</span><span class="special">);</span> <span class="comment">// Else, do nothing.</span> 2697 <span class="special">}</span> 2698<span class="special">};</span> 2699 2700<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 2701 <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span> <span class="identifier">js</span> <span class="special">=</span> <span class="string">"John Smith"</span><span class="special">;</span> 2702 2703 <span class="identifier">relaxed_name_list</span> <span class="identifier">rl</span><span class="special">;</span> 2704 <span class="identifier">rl</span><span class="special">.</span><span class="identifier">put</span><span class="special">(</span><span class="identifier">js</span><span class="special">);</span> 2705 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">rl</span><span class="special">.</span><span class="identifier">has</span><span class="special">(</span><span class="identifier">js</span><span class="special">));</span> 2706 <span class="identifier">rl</span><span class="special">.</span><span class="identifier">put</span><span class="special">(</span><span class="identifier">js</span><span class="special">);</span> <span class="comment">// OK, relaxed contracts allow calling this again (do nothing).</span> 2707 2708 <span class="identifier">name_list</span> <span class="identifier">nl</span><span class="special">;</span> 2709 <span class="identifier">nl</span><span class="special">.</span><span class="identifier">put</span><span class="special">(</span><span class="identifier">js</span><span class="special">);</span> 2710 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">nl</span><span class="special">.</span><span class="identifier">has</span><span class="special">(</span><span class="identifier">js</span><span class="special">));</span> 2711 <span class="comment">// nl.put(js); // Error, contracts do not allow calling this again.</span> 2712 2713 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 2714<span class="special">}</span> 2715</pre> 2716<p> 2717 </p> 2718</div> 2719<div class="section"> 2720<div class="titlepage"><div><div><h3 class="title"> 2721<a name="boost_contract.examples.__mitchell02___dictionary__key_value_map"></a><a class="link" href="examples.html#boost_contract.examples.__mitchell02___dictionary__key_value_map" title="[Mitchell02] Dictionary: Key-value map">[Mitchell02] 2722 Dictionary: Key-value map</a> 2723</h3></div></div></div> 2724<p> 2725</p> 2726<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 2727<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">utility</span><span class="special">></span> 2728<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">map</span><span class="special">></span> 2729<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 2730 2731<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">K</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 2732<span class="keyword">class</span> <span class="identifier">dictionary</span> <span class="special">{</span> 2733 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 2734 2735 <span class="keyword">void</span> <span class="identifier">invariant</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2736 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> <span class="comment">// Non-negative count.</span> 2737 <span class="special">}</span> 2738 2739<span class="keyword">public</span><span class="special">:</span> 2740 <span class="comment">/* Creation */</span> 2741 2742 <span class="comment">// Create empty dictionary.</span> 2743 <span class="identifier">dictionary</span><span class="special">()</span> <span class="special">{</span> 2744 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2745 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2746 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span> <span class="comment">// Empty.</span> 2747 <span class="special">})</span> 2748 <span class="special">;</span> 2749 <span class="special">}</span> 2750 2751 <span class="comment">// Destroy dictionary.</span> 2752 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">dictionary</span><span class="special">()</span> <span class="special">{</span> 2753 <span class="comment">// Check invariants.</span> 2754 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 2755 <span class="special">}</span> 2756 2757 <span class="comment">/* Basic Queries */</span> 2758 2759 <span class="comment">// Number of key entries.</span> 2760 <span class="keyword">int</span> <span class="identifier">count</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2761 <span class="comment">// Check invariants.</span> 2762 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 2763 <span class="keyword">return</span> <span class="identifier">items_</span><span class="special">.</span><span class="identifier">size</span><span class="special">();</span> 2764 <span class="special">}</span> 2765 2766 <span class="comment">// Has entry for key?</span> 2767 <span class="keyword">bool</span> <span class="identifier">has</span><span class="special">(</span><span class="identifier">K</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">key</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> 2768 <span class="keyword">bool</span> <span class="identifier">result</span><span class="special">;</span> 2769 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2770 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2771 <span class="comment">// Empty has no key.</span> 2772 <span class="keyword">if</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">)</span> <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">result</span><span class="special">);</span> 2773 <span class="special">})</span> 2774 <span class="special">;</span> 2775 2776 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">items_</span><span class="special">.</span><span class="identifier">find</span><span class="special">(</span><span class="identifier">key</span><span class="special">)</span> <span class="special">!=</span> <span class="identifier">items_</span><span class="special">.</span><span class="identifier">end</span><span class="special">());</span> 2777 <span class="special">}</span> 2778 2779 <span class="comment">// Value for a given key.</span> 2780 <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value_for</span><span class="special">(</span><span class="identifier">K</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">key</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> 2781 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2782 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 2783 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">has</span><span class="special">(</span><span class="identifier">key</span><span class="special">));</span> <span class="comment">// Has key.</span> 2784 <span class="special">})</span> 2785 <span class="special">;</span> 2786 2787 <span class="comment">// Find != end because of precondition (no defensive programming).</span> 2788 <span class="keyword">return</span> <span class="identifier">items_</span><span class="special">.</span><span class="identifier">find</span><span class="special">(</span><span class="identifier">key</span><span class="special">)-></span><span class="identifier">second</span><span class="special">;</span> 2789 <span class="special">}</span> 2790 2791 <span class="comment">/* Commands */</span> 2792 2793 <span class="comment">// Add value of a given key.</span> 2794 <span class="keyword">void</span> <span class="identifier">put</span><span class="special">(</span><span class="identifier">K</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">key</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 2795 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">old_count</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">count</span><span class="special">());</span> 2796 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2797 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 2798 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">has</span><span class="special">(</span><span class="identifier">key</span><span class="special">));</span> <span class="comment">// Has not key already.</span> 2799 <span class="special">})</span> 2800 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2801 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_count</span> <span class="special">+</span> <span class="number">1</span><span class="special">);</span> <span class="comment">// Count inc.</span> 2802 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">has</span><span class="special">(</span><span class="identifier">key</span><span class="special">));</span> <span class="comment">// Has key.</span> 2803 <span class="comment">// Value set for key.</span> 2804 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">value_for</span><span class="special">(</span><span class="identifier">key</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">value</span><span class="special">);</span> 2805 <span class="special">})</span> 2806 <span class="special">;</span> 2807 2808 <span class="identifier">items_</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">make_pair</span><span class="special">(</span><span class="identifier">key</span><span class="special">,</span> <span class="identifier">value</span><span class="special">));</span> 2809 <span class="special">}</span> 2810 2811 <span class="comment">// Remove value for given key.</span> 2812 <span class="keyword">void</span> <span class="identifier">remove</span><span class="special">(</span><span class="identifier">K</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">key</span><span class="special">)</span> <span class="special">{</span> 2813 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">old_count</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">count</span><span class="special">());</span> 2814 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 2815 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 2816 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">has</span><span class="special">(</span><span class="identifier">key</span><span class="special">));</span> <span class="comment">// Has key.</span> 2817 <span class="special">})</span> 2818 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2819 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_count</span> <span class="special">-</span> <span class="number">1</span><span class="special">);</span> <span class="comment">// Count dec.</span> 2820 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">has</span><span class="special">(</span><span class="identifier">key</span><span class="special">));</span> <span class="comment">// Has not key.</span> 2821 <span class="special">})</span> 2822 <span class="special">;</span> 2823 2824 <span class="identifier">items_</span><span class="special">.</span><span class="identifier">erase</span><span class="special">(</span><span class="identifier">key</span><span class="special">);</span> 2825 <span class="special">}</span> 2826 2827<span class="keyword">private</span><span class="special">:</span> 2828 <span class="identifier">std</span><span class="special">::</span><span class="identifier">map</span><span class="special"><</span><span class="identifier">K</span><span class="special">,</span> <span class="identifier">T</span><span class="special">></span> <span class="identifier">items_</span><span class="special">;</span> 2829<span class="special">};</span> 2830 2831<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 2832 <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span> <span class="identifier">js</span> <span class="special">=</span> <span class="string">"John Smith"</span><span class="special">;</span> 2833 2834 <span class="identifier">dictionary</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">,</span> <span class="keyword">int</span><span class="special">></span> <span class="identifier">ages</span><span class="special">;</span> 2835 <span class="identifier">assert</span><span class="special">(!</span><span class="identifier">ages</span><span class="special">.</span><span class="identifier">has</span><span class="special">(</span><span class="identifier">js</span><span class="special">));</span> 2836 2837 <span class="identifier">ages</span><span class="special">.</span><span class="identifier">put</span><span class="special">(</span><span class="identifier">js</span><span class="special">,</span> <span class="number">23</span><span class="special">);</span> 2838 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">ages</span><span class="special">.</span><span class="identifier">value_for</span><span class="special">(</span><span class="identifier">js</span><span class="special">)</span> <span class="special">==</span> <span class="number">23</span><span class="special">);</span> 2839 2840 <span class="identifier">ages</span><span class="special">.</span><span class="identifier">remove</span><span class="special">(</span><span class="identifier">js</span><span class="special">);</span> 2841 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">ages</span><span class="special">.</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span> 2842 2843 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 2844<span class="special">}</span> 2845</pre> 2846<p> 2847 </p> 2848</div> 2849<div class="section"> 2850<div class="titlepage"><div><div><h3 class="title"> 2851<a name="boost_contract.examples.__mitchell02___courier__subcontracting_and_static_class_invariants"></a><a class="link" href="examples.html#boost_contract.examples.__mitchell02___courier__subcontracting_and_static_class_invariants" title="[Mitchell02] Courier: Subcontracting and static class invariants">[Mitchell02] 2852 Courier: Subcontracting and static class invariants</a> 2853</h3></div></div></div> 2854<p> 2855</p> 2856<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 2857<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">string</span><span class="special">></span> 2858<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 2859 2860<span class="keyword">struct</span> <span class="identifier">package</span> <span class="special">{</span> 2861 <span class="keyword">double</span> <span class="identifier">weight_kg</span><span class="special">;</span> 2862 <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">location</span><span class="special">;</span> 2863 <span class="keyword">double</span> <span class="identifier">accepted_hour</span><span class="special">;</span> 2864 <span class="keyword">double</span> <span class="identifier">delivered_hour</span><span class="special">;</span> 2865 2866 <span class="keyword">explicit</span> <span class="identifier">package</span><span class="special">(</span> 2867 <span class="keyword">double</span> <span class="identifier">_weight_kg</span><span class="special">,</span> 2868 <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">_location</span> <span class="special">=</span> <span class="string">""</span><span class="special">,</span> 2869 <span class="keyword">double</span> <span class="identifier">_accepted_hour</span> <span class="special">=</span> <span class="number">0.0</span><span class="special">,</span> 2870 <span class="keyword">double</span> <span class="identifier">_delivered_hour</span> <span class="special">=</span> <span class="number">0.0</span> 2871 <span class="special">)</span> <span class="special">:</span> 2872 <span class="identifier">weight_kg</span><span class="special">(</span><span class="identifier">_weight_kg</span><span class="special">),</span> 2873 <span class="identifier">location</span><span class="special">(</span><span class="identifier">_location</span><span class="special">),</span> 2874 <span class="identifier">accepted_hour</span><span class="special">(</span><span class="identifier">_accepted_hour</span><span class="special">),</span> 2875 <span class="identifier">delivered_hour</span><span class="special">(</span><span class="identifier">_delivered_hour</span><span class="special">)</span> 2876 <span class="special">{}</span> 2877<span class="special">};</span> 2878 2879<span class="comment">// Courier for package delivery.</span> 2880<span class="keyword">class</span> <span class="identifier">courier</span> 2881 <span class="preprocessor">#define</span> <span class="identifier">BASES</span> <span class="keyword">private</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor_precondition</span><span class="special"><</span><span class="identifier">courier</span><span class="special">></span> 2882 <span class="special">:</span> <span class="identifier">BASES</span> 2883<span class="special">{</span> 2884 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 2885 2886 <span class="keyword">typedef</span> <span class="identifier">BOOST_CONTRACT_BASE_TYPES</span><span class="special">(</span><span class="identifier">BASES</span><span class="special">)</span> <span class="identifier">base_types</span><span class="special">;</span> 2887 <span class="preprocessor">#undef</span> <span class="identifier">BASES</span> 2888 2889 <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">static_invariant</span><span class="special">()</span> <span class="special">{</span> 2890 <span class="comment">// Positive min. insurance.</span> 2891 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">min_insurance_usd</span> <span class="special">>=</span> <span class="number">0.0</span><span class="special">);</span> 2892 <span class="special">}</span> 2893 2894 <span class="keyword">void</span> <span class="identifier">invariant</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2895 <span class="comment">// Above min. insurance.</span> 2896 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">insurance_cover_usd</span><span class="special">()</span> <span class="special">>=</span> <span class="identifier">min_insurance_usd</span><span class="special">);</span> 2897 <span class="special">}</span> 2898 2899<span class="keyword">public</span><span class="special">:</span> 2900 <span class="keyword">static</span> <span class="keyword">double</span> <span class="identifier">min_insurance_usd</span><span class="special">;</span> 2901 2902 <span class="comment">/* Creation */</span> 2903 2904 <span class="comment">// Create courier with specified insurance value.</span> 2905 <span class="keyword">explicit</span> <span class="identifier">courier</span><span class="special">(</span><span class="keyword">double</span> <span class="identifier">_insurance_cover_usd</span> <span class="special">=</span> <span class="identifier">min_insurance_usd</span><span class="special">)</span> <span class="special">:</span> 2906 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor_precondition</span><span class="special"><</span><span class="identifier">courier</span><span class="special">>([&]</span> <span class="special">{</span> 2907 <span class="comment">// Positive insurance.</span> 2908 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">_insurance_cover_usd</span> <span class="special">>=</span> <span class="number">0.0</span><span class="special">);</span> 2909 <span class="special">}),</span> 2910 <span class="identifier">insurance_cover_usd_</span><span class="special">(</span><span class="identifier">_insurance_cover_usd</span><span class="special">)</span> 2911 <span class="special">{</span> 2912 <span class="comment">// Check invariants.</span> 2913 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 2914 <span class="special">}</span> 2915 2916 <span class="comment">// Destroy courier.</span> 2917 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">courier</span><span class="special">()</span> <span class="special">{</span> 2918 <span class="comment">// Check invariants.</span> 2919 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 2920 <span class="special">}</span> 2921 2922 <span class="comment">/* Queries */</span> 2923 2924 <span class="comment">// Return insurance cover.</span> 2925 <span class="keyword">double</span> <span class="identifier">insurance_cover_usd</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2926 <span class="comment">// Check invariants.</span> 2927 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 2928 <span class="keyword">return</span> <span class="identifier">insurance_cover_usd_</span><span class="special">;</span> 2929 <span class="special">}</span> 2930 2931 <span class="comment">/* Commands */</span> 2932 2933 <span class="comment">// Deliver package to destination.</span> 2934 <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">deliver</span><span class="special">(</span> 2935 <span class="identifier">package</span><span class="special">&</span> <span class="identifier">package_delivery</span><span class="special">,</span> 2936 <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">destination</span><span class="special">,</span> 2937 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span> 2938 <span class="special">)</span> <span class="special">{</span> 2939 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="keyword">this</span><span class="special">)</span> 2940 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 2941 <span class="comment">// Within max weight of this delivery.</span> 2942 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">package_delivery</span><span class="special">.</span><span class="identifier">weight_kg</span> <span class="special"><</span> <span class="number">5.0</span><span class="special">);</span> 2943 <span class="special">})</span> 2944 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 2945 <span class="comment">// Within max delivery type.</span> 2946 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="keyword">double</span><span class="special">(</span><span class="identifier">package_delivery</span><span class="special">.</span><span class="identifier">delivered_hour</span> <span class="special">-</span> 2947 <span class="identifier">package_delivery</span><span class="special">.</span><span class="identifier">accepted_hour</span><span class="special">)</span> <span class="special"><=</span> <span class="number">3.0</span><span class="special">);</span> 2948 <span class="comment">// Delivered at destination.</span> 2949 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">package_delivery</span><span class="special">.</span><span class="identifier">location</span> <span class="special">==</span> <span class="identifier">destination</span><span class="special">);</span> 2950 <span class="special">})</span> 2951 <span class="special">;</span> 2952 2953 <span class="identifier">package_delivery</span><span class="special">.</span><span class="identifier">location</span> <span class="special">=</span> <span class="identifier">destination</span><span class="special">;</span> 2954 <span class="comment">// Delivery takes 2.5 hours.</span> 2955 <span class="identifier">package_delivery</span><span class="special">.</span><span class="identifier">delivered_hour</span> <span class="special">=</span> <span class="identifier">package_delivery</span><span class="special">.</span><span class="identifier">accepted_hour</span> <span class="special">+</span> <span class="number">2.5</span><span class="special">;</span> 2956 <span class="special">}</span> 2957 2958<span class="keyword">private</span><span class="special">:</span> 2959 <span class="keyword">double</span> <span class="identifier">insurance_cover_usd_</span><span class="special">;</span> 2960<span class="special">};</span> 2961 2962<span class="keyword">double</span> <span class="identifier">courier</span><span class="special">::</span><span class="identifier">min_insurance_usd</span> <span class="special">=</span> <span class="number">10.0e+6</span><span class="special">;</span> 2963 2964<span class="comment">// Different courier for package delivery.</span> 2965<span class="keyword">class</span> <span class="identifier">different_courier</span> 2966 <span class="preprocessor">#define</span> <span class="identifier">BASES</span> <span class="keyword">private</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor_precondition</span><span class="special"><</span> <span class="special">\</span> 2967 <span class="identifier">different_courier</span><span class="special">>,</span> <span class="keyword">public</span> <span class="identifier">courier</span> 2968 <span class="special">:</span> <span class="identifier">BASES</span> 2969<span class="special">{</span> 2970 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 2971 2972 <span class="keyword">typedef</span> <span class="identifier">BOOST_CONTRACT_BASE_TYPES</span><span class="special">(</span><span class="identifier">BASES</span><span class="special">)</span> <span class="identifier">base_types</span><span class="special">;</span> <span class="comment">// Subcontracting.</span> 2973 <span class="preprocessor">#undef</span> <span class="identifier">BASES</span> 2974 2975 <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">static_invariant</span><span class="special">()</span> <span class="special">{</span> 2976 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span> <span class="comment">// Better insurance amount.</span> 2977 <span class="identifier">different_insurance_usd</span> <span class="special">>=</span> <span class="identifier">courier</span><span class="special">::</span><span class="identifier">min_insurance_usd</span><span class="special">);</span> 2978 <span class="special">}</span> 2979 2980 <span class="keyword">void</span> <span class="identifier">invariant</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 2981 <span class="comment">// Above different insurance value.</span> 2982 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">insurance_cover_usd</span><span class="special">()</span> <span class="special">>=</span> <span class="identifier">different_insurance_usd</span><span class="special">);</span> 2983 <span class="special">}</span> 2984 2985 <span class="identifier">BOOST_CONTRACT_OVERRIDE</span><span class="special">(</span><span class="identifier">deliver</span><span class="special">)</span> 2986 2987<span class="keyword">public</span><span class="special">:</span> 2988 <span class="keyword">static</span> <span class="keyword">double</span> <span class="identifier">different_insurance_usd</span><span class="special">;</span> 2989 2990 <span class="comment">/* Creation */</span> 2991 2992 <span class="comment">// Create courier with specified insurance value.</span> 2993 <span class="keyword">explicit</span> <span class="identifier">different_courier</span><span class="special">(</span> 2994 <span class="keyword">double</span> <span class="identifier">insurance_cover_usd</span> <span class="special">=</span> <span class="identifier">different_insurance_usd</span><span class="special">)</span> <span class="special">:</span> 2995 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor_precondition</span><span class="special"><</span><span class="identifier">different_courier</span><span class="special">>([&]</span> <span class="special">{</span> 2996 <span class="comment">// Positive insurance value.</span> 2997 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">insurance_cover_usd</span> <span class="special">></span> <span class="number">0.0</span><span class="special">);</span> 2998 <span class="special">}),</span> 2999 <span class="identifier">courier</span><span class="special">(</span><span class="identifier">insurance_cover_usd</span><span class="special">)</span> 3000 <span class="special">{</span> 3001 <span class="comment">// Check invariants.</span> 3002 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3003 <span class="special">}</span> 3004 3005 <span class="comment">// Destroy courier.</span> 3006 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">different_courier</span><span class="special">()</span> <span class="special">{</span> 3007 <span class="comment">// Check invariants.</span> 3008 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3009 <span class="special">}</span> 3010 3011 <span class="comment">/* Commands */</span> 3012 3013 <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">deliver</span><span class="special">(</span> 3014 <span class="identifier">package</span><span class="special">&</span> <span class="identifier">package_delivery</span><span class="special">,</span> 3015 <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">destination</span><span class="special">,</span> 3016 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span> 3017 <span class="special">)</span> <span class="comment">/* override */</span> <span class="special">{</span> 3018 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special"><</span> 3019 <span class="identifier">override_deliver</span> 3020 <span class="special">>(</span><span class="identifier">v</span><span class="special">,</span> <span class="special">&</span><span class="identifier">different_courier</span><span class="special">::</span><span class="identifier">deliver</span><span class="special">,</span> <span class="keyword">this</span><span class="special">,</span> <span class="identifier">package_delivery</span><span class="special">,</span> <span class="identifier">destination</span><span class="special">)</span> 3021 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 3022 <span class="comment">// Package can weight more (weaker precondition).</span> 3023 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">package_delivery</span><span class="special">.</span><span class="identifier">weight_kg</span> <span class="special"><=</span> <span class="number">8.0</span><span class="special">);</span> 3024 <span class="special">})</span> 3025 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3026 <span class="comment">// Faster delivery (stronger postcondition).</span> 3027 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="keyword">double</span><span class="special">(</span><span class="identifier">package_delivery</span><span class="special">.</span><span class="identifier">delivered_hour</span> <span class="special">-</span> 3028 <span class="identifier">package_delivery</span><span class="special">.</span><span class="identifier">accepted_hour</span><span class="special">)</span> <span class="special"><=</span> <span class="number">2.0</span><span class="special">);</span> 3029 <span class="comment">// Inherited "delivery at destination" postcondition.</span> 3030 <span class="special">})</span> 3031 <span class="special">;</span> 3032 3033 <span class="identifier">package_delivery</span><span class="special">.</span><span class="identifier">location</span> <span class="special">=</span> <span class="identifier">destination</span><span class="special">;</span> 3034 <span class="comment">// Delivery takes 0.5 hours.</span> 3035 <span class="identifier">package_delivery</span><span class="special">.</span><span class="identifier">delivered_hour</span> <span class="special">=</span> <span class="identifier">package_delivery</span><span class="special">.</span><span class="identifier">accepted_hour</span> <span class="special">+</span> <span class="number">0.5</span><span class="special">;</span> 3036 <span class="special">}</span> 3037<span class="special">};</span> 3038 3039<span class="keyword">double</span> <span class="identifier">different_courier</span><span class="special">::</span><span class="identifier">different_insurance_usd</span> <span class="special">=</span> <span class="number">20.0e+6</span><span class="special">;</span> 3040 3041<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 3042 <span class="identifier">package</span> <span class="identifier">cups</span><span class="special">(</span><span class="number">3.6</span><span class="special">,</span> <span class="string">"store"</span><span class="special">);</span> 3043 <span class="identifier">courier</span> <span class="identifier">c</span><span class="special">;</span> 3044 <span class="identifier">c</span><span class="special">.</span><span class="identifier">deliver</span><span class="special">(</span><span class="identifier">cups</span><span class="special">,</span> <span class="string">"home"</span><span class="special">);</span> 3045 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">cups</span><span class="special">.</span><span class="identifier">location</span> <span class="special">==</span> <span class="string">"home"</span><span class="special">);</span> 3046 3047 <span class="identifier">package</span> <span class="identifier">desk</span><span class="special">(</span><span class="number">7.2</span><span class="special">,</span> <span class="string">"store"</span><span class="special">);</span> 3048 <span class="identifier">different_courier</span> <span class="identifier">dc</span><span class="special">;</span> 3049 <span class="identifier">dc</span><span class="special">.</span><span class="identifier">deliver</span><span class="special">(</span><span class="identifier">desk</span><span class="special">,</span> <span class="string">"office"</span><span class="special">);</span> 3050 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">desk</span><span class="special">.</span><span class="identifier">location</span> <span class="special">==</span> <span class="string">"office"</span><span class="special">);</span> 3051 3052 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 3053<span class="special">}</span> 3054</pre> 3055<p> 3056 </p> 3057</div> 3058<div class="section"> 3059<div class="titlepage"><div><div><h3 class="title"> 3060<a name="boost_contract.examples.__mitchell02___stack__stack_like_container"></a><a class="link" href="examples.html#boost_contract.examples.__mitchell02___stack__stack_like_container" title="[Mitchell02] Stack: Stack-like container">[Mitchell02] 3061 Stack: Stack-like container</a> 3062</h3></div></div></div> 3063<p> 3064</p> 3065<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 3066<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">optional</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 3067<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">vector</span><span class="special">></span> 3068<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 3069 3070<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 3071<span class="keyword">class</span> <span class="identifier">stack</span> <span class="special">{</span> 3072 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 3073 3074 <span class="keyword">void</span> <span class="identifier">invariant</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3075 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> <span class="comment">// Non-negative count.</span> 3076 <span class="special">}</span> 3077 3078<span class="keyword">public</span><span class="special">:</span> 3079 <span class="comment">/* Creation */</span> 3080 3081 <span class="comment">// Create empty stack.</span> 3082 <span class="identifier">stack</span><span class="special">()</span> <span class="special">{</span> 3083 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3084 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3085 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span> <span class="comment">// Empty.</span> 3086 <span class="special">})</span> 3087 <span class="special">;</span> 3088 <span class="special">}</span> 3089 3090 <span class="comment">// Destroy stack.</span> 3091 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">stack</span><span class="special">()</span> <span class="special">{</span> 3092 <span class="comment">// Check invariants.</span> 3093 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3094 <span class="special">}</span> 3095 3096 <span class="comment">/* Basic Queries */</span> 3097 3098 <span class="comment">// Number of items.</span> 3099 <span class="keyword">int</span> <span class="identifier">count</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3100 <span class="comment">// Check invariants.</span> 3101 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3102 <span class="keyword">return</span> <span class="identifier">items_</span><span class="special">.</span><span class="identifier">size</span><span class="special">();</span> 3103 <span class="special">}</span> 3104 3105 <span class="comment">// Item at index in [1, count()] (as in Eiffel).</span> 3106 <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">item_at</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">index</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> 3107 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3108 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 3109 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">index</span> <span class="special">></span> <span class="number">0</span><span class="special">);</span> <span class="comment">// Positive index.</span> 3110 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">index</span> <span class="special"><=</span> <span class="identifier">count</span><span class="special">());</span> <span class="comment">// Index within count.</span> 3111 <span class="special">})</span> 3112 <span class="special">;</span> 3113 3114 <span class="keyword">return</span> <span class="identifier">items_</span><span class="special">[</span><span class="identifier">index</span> <span class="special">-</span> <span class="number">1</span><span class="special">];</span> 3115 <span class="special">}</span> 3116 3117 <span class="comment">/* Derived Queries */</span> 3118 3119 <span class="comment">// If no items.</span> 3120 <span class="keyword">bool</span> <span class="identifier">is_empty</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3121 <span class="keyword">bool</span> <span class="identifier">result</span><span class="special">;</span> 3122 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3123 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3124 <span class="comment">// Consistent with count.</span> 3125 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">));</span> 3126 <span class="special">})</span> 3127 <span class="special">;</span> 3128 3129 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span> 3130 <span class="special">}</span> 3131 3132 <span class="comment">// Top item.</span> 3133 <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">item</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3134 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&></span> <span class="identifier">result</span><span class="special">;</span> <span class="comment">// Avoid extra construction of T.</span> 3135 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3136 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 3137 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">></span> <span class="number">0</span><span class="special">);</span> <span class="comment">// Not empty.</span> 3138 <span class="special">})</span> 3139 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3140 <span class="comment">// Item on top.</span> 3141 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(*</span><span class="identifier">result</span> <span class="special">==</span> <span class="identifier">item_at</span><span class="special">(</span><span class="identifier">count</span><span class="special">()));</span> 3142 <span class="special">})</span> 3143 <span class="special">;</span> 3144 3145 <span class="keyword">return</span> <span class="special">*(</span><span class="identifier">result</span> <span class="special">=</span> <span class="identifier">item_at</span><span class="special">(</span><span class="identifier">count</span><span class="special">()));</span> 3146 <span class="special">}</span> 3147 3148 <span class="comment">/* Commands */</span> 3149 3150 <span class="comment">// Push item to the top.</span> 3151 <span class="keyword">void</span> <span class="identifier">put</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">new_item</span><span class="special">)</span> <span class="special">{</span> 3152 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">old_count</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">count</span><span class="special">());</span> 3153 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3154 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3155 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_count</span> <span class="special">+</span> <span class="number">1</span><span class="special">);</span> <span class="comment">// Count inc.</span> 3156 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">item</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">new_item</span><span class="special">);</span> <span class="comment">// Item set.</span> 3157 <span class="special">})</span> 3158 <span class="special">;</span> 3159 3160 <span class="identifier">items_</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">new_item</span><span class="special">);</span> 3161 <span class="special">}</span> 3162 3163 <span class="comment">// Pop top item.</span> 3164 <span class="keyword">void</span> <span class="identifier">remove</span><span class="special">()</span> <span class="special">{</span> 3165 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">old_count</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">count</span><span class="special">());</span> 3166 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3167 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 3168 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">></span> <span class="number">0</span><span class="special">);</span> <span class="comment">// Not empty.</span> 3169 <span class="special">})</span> 3170 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3171 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_count</span> <span class="special">-</span> <span class="number">1</span><span class="special">);</span> <span class="comment">// Count dec.</span> 3172 <span class="special">})</span> 3173 <span class="special">;</span> 3174 3175 <span class="identifier">items_</span><span class="special">.</span><span class="identifier">pop_back</span><span class="special">();</span> 3176 <span class="special">}</span> 3177 3178<span class="keyword">private</span><span class="special">:</span> 3179 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="identifier">items_</span><span class="special">;</span> 3180<span class="special">};</span> 3181 3182<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 3183 <span class="identifier">stack</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">s</span><span class="special">;</span> 3184 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span> 3185 3186 <span class="identifier">s</span><span class="special">.</span><span class="identifier">put</span><span class="special">(</span><span class="number">123</span><span class="special">);</span> 3187 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">item</span><span class="special">()</span> <span class="special">==</span> <span class="number">123</span><span class="special">);</span> 3188 3189 <span class="identifier">s</span><span class="special">.</span><span class="identifier">remove</span><span class="special">();</span> 3190 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">is_empty</span><span class="special">());</span> 3191 3192 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 3193<span class="special">}</span> 3194</pre> 3195<p> 3196 </p> 3197</div> 3198<div class="section"> 3199<div class="titlepage"><div><div><h3 class="title"> 3200<a name="boost_contract.examples.__mitchell02___simple_queue__queue_like_container_and_disable_old_value_copies_for_audit_assertions"></a><a class="link" href="examples.html#boost_contract.examples.__mitchell02___simple_queue__queue_like_container_and_disable_old_value_copies_for_audit_assertions" title="[Mitchell02] Simple Queue: Queue-like container and disable old value copies for audit assertions">[Mitchell02] 3201 Simple Queue: Queue-like container and disable old value copies for audit assertions</a> 3202</h3></div></div></div> 3203<p> 3204</p> 3205<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 3206<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">optional</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 3207<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">vector</span><span class="special">></span> 3208<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 3209 3210<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 3211<span class="keyword">class</span> <span class="identifier">simple_queue</span> 3212 <span class="preprocessor">#define</span> <span class="identifier">BASES</span> <span class="keyword">private</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor_precondition</span><span class="special"><</span> <span class="special">\</span> 3213 <span class="identifier">simple_queue</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">></span> 3214 <span class="special">:</span> <span class="identifier">BASES</span> 3215<span class="special">{</span> 3216 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 3217 3218 <span class="keyword">typedef</span> <span class="identifier">BOOST_CONTRACT_BASE_TYPES</span><span class="special">(</span><span class="identifier">BASES</span><span class="special">)</span> <span class="identifier">base_types</span><span class="special">;</span> 3219 <span class="preprocessor">#undef</span> <span class="identifier">BASES</span> 3220 3221 <span class="keyword">void</span> <span class="identifier">invariant</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3222 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> <span class="comment">// Non-negative count.</span> 3223 <span class="special">}</span> 3224 3225<span class="keyword">public</span><span class="special">:</span> 3226 <span class="comment">/* Creation */</span> 3227 3228 <span class="comment">// Create empty queue.</span> 3229 <span class="keyword">explicit</span> <span class="identifier">simple_queue</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">a_capacity</span><span class="special">)</span> <span class="special">:</span> 3230 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor_precondition</span><span class="special"><</span><span class="identifier">simple_queue</span><span class="special">>([&]</span> <span class="special">{</span> 3231 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">a_capacity</span> <span class="special">></span> <span class="number">0</span><span class="special">);</span> <span class="comment">// Positive capacity.</span> 3232 <span class="special">})</span> 3233 <span class="special">{</span> 3234 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3235 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3236 <span class="comment">// Capacity set.</span> 3237 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">a_capacity</span><span class="special">);</span> 3238 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">is_empty</span><span class="special">());</span> <span class="comment">// Empty.</span> 3239 <span class="special">})</span> 3240 <span class="special">;</span> 3241 3242 <span class="identifier">items_</span><span class="special">.</span><span class="identifier">reserve</span><span class="special">(</span><span class="identifier">a_capacity</span><span class="special">);</span> 3243 <span class="special">}</span> 3244 3245 <span class="comment">// Destroy queue.</span> 3246 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">simple_queue</span><span class="special">()</span> <span class="special">{</span> 3247 <span class="comment">// Check invariants.</span> 3248 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3249 <span class="special">}</span> 3250 3251 <span class="comment">/* Basic Queries */</span> 3252 3253 <span class="comment">// Items in queue (in their order).</span> 3254 <span class="comment">// (Somewhat exposes implementation but allows to check more contracts.)</span> 3255 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">items</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3256 <span class="comment">// Check invariants.</span> 3257 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3258 <span class="keyword">return</span> <span class="identifier">items_</span><span class="special">;</span> 3259 <span class="special">}</span> 3260 3261 <span class="comment">// Max number of items queue can hold.</span> 3262 <span class="keyword">int</span> <span class="identifier">capacity</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3263 <span class="comment">// Check invariants.</span> 3264 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3265 <span class="keyword">return</span> <span class="identifier">items_</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">();</span> 3266 <span class="special">}</span> 3267 3268 <span class="comment">/* Derived Queries */</span> 3269 3270 <span class="comment">// Number of items.</span> 3271 <span class="keyword">int</span> <span class="identifier">count</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3272 <span class="keyword">int</span> <span class="identifier">result</span><span class="special">;</span> 3273 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3274 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3275 <span class="comment">// Return items count.</span> 3276 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">==</span> <span class="keyword">int</span><span class="special">(</span><span class="identifier">items</span><span class="special">().</span><span class="identifier">size</span><span class="special">()));</span> 3277 <span class="special">})</span> 3278 <span class="special">;</span> 3279 3280 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">items_</span><span class="special">.</span><span class="identifier">size</span><span class="special">();</span> 3281 <span class="special">}</span> 3282 3283 <span class="comment">// Item at head.</span> 3284 <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">head</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3285 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&></span> <span class="identifier">result</span><span class="special">;</span> 3286 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3287 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 3288 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">is_empty</span><span class="special">());</span> <span class="comment">// Not empty.</span> 3289 <span class="special">})</span> 3290 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3291 <span class="comment">// Return item on top.</span> 3292 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(*</span><span class="identifier">result</span> <span class="special">==</span> <span class="identifier">items</span><span class="special">().</span><span class="identifier">at</span><span class="special">(</span><span class="number">0</span><span class="special">));</span> 3293 <span class="special">})</span> 3294 <span class="special">;</span> 3295 3296 <span class="keyword">return</span> <span class="special">*(</span><span class="identifier">result</span> <span class="special">=</span> <span class="identifier">items_</span><span class="special">.</span><span class="identifier">at</span><span class="special">(</span><span class="number">0</span><span class="special">));</span> 3297 <span class="special">}</span> 3298 3299 <span class="comment">// If queue contains no item.</span> 3300 <span class="keyword">bool</span> <span class="identifier">is_empty</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3301 <span class="keyword">bool</span> <span class="identifier">result</span><span class="special">;</span> 3302 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3303 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3304 <span class="comment">// Consistent with count.</span> 3305 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">));</span> 3306 <span class="special">})</span> 3307 <span class="special">;</span> 3308 3309 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">items_</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span> 3310 <span class="special">}</span> 3311 3312 <span class="comment">// If queue has no room for another item.</span> 3313 <span class="keyword">bool</span> <span class="identifier">is_full</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3314 <span class="keyword">bool</span> <span class="identifier">result</span><span class="special">;</span> 3315 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3316 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3317 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span> <span class="comment">// Consistent with size and capacity.</span> 3318 <span class="identifier">result</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="keyword">int</span><span class="special">(</span><span class="identifier">items</span><span class="special">().</span><span class="identifier">size</span><span class="special">())));</span> 3319 <span class="special">})</span> 3320 <span class="special">;</span> 3321 3322 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">items_</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">items_</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">());</span> 3323 <span class="special">}</span> 3324 3325 <span class="comment">/* Commands */</span> 3326 3327 <span class="comment">// Remove head itme and shift all other items.</span> 3328 <span class="keyword">void</span> <span class="identifier">remove</span><span class="special">()</span> <span class="special">{</span> 3329 <span class="comment">// Expensive all_equal postcond. and old_items copy might be skipped.</span> 3330 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">></span> <span class="identifier">old_items</span><span class="special">;</span> 3331 <span class="preprocessor">#ifdef</span> <span class="identifier">BOOST_CONTRACT_AUDIITS</span> 3332 <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">items</span><span class="special">())</span> 3333 <span class="preprocessor">#endif</span> <span class="comment">// Else, leave old pointer null...</span> 3334 <span class="special">;</span> 3335 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">old_count</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">count</span><span class="special">());</span> 3336 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3337 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 3338 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">is_empty</span><span class="special">());</span> <span class="comment">// Not empty.</span> 3339 <span class="special">})</span> 3340 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3341 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_count</span> <span class="special">-</span> <span class="number">1</span><span class="special">);</span> <span class="comment">// Count dec.</span> 3342 <span class="comment">// ...following skipped #ifndef AUDITS.</span> 3343 <span class="keyword">if</span><span class="special">(</span><span class="identifier">old_items</span><span class="special">)</span> <span class="identifier">all_equal</span><span class="special">(</span><span class="identifier">items</span><span class="special">(),</span> <span class="special">*</span><span class="identifier">old_items</span><span class="special">,</span> <span class="comment">/* shifted = */</span> <span class="number">1</span><span class="special">);</span> 3344 <span class="special">})</span> 3345 <span class="special">;</span> 3346 3347 <span class="identifier">items_</span><span class="special">.</span><span class="identifier">erase</span><span class="special">(</span><span class="identifier">items_</span><span class="special">.</span><span class="identifier">begin</span><span class="special">());</span> 3348 <span class="special">}</span> 3349 3350 <span class="comment">// Add item to tail.</span> 3351 <span class="keyword">void</span> <span class="identifier">put</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">item</span><span class="special">)</span> <span class="special">{</span> 3352 <span class="comment">// Expensive all_equal postcond. and old_items copy might be skipped.</span> 3353 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">></span> <span class="identifier">old_items</span><span class="special">;</span> 3354 <span class="preprocessor">#ifdef</span> <span class="identifier">BOOST_CONTRACT_AUDITS</span> 3355 <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">items</span><span class="special">())</span> 3356 <span class="preprocessor">#endif</span> <span class="comment">// Else, leave old pointer null...</span> 3357 <span class="special">;</span> 3358 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">old_count</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">count</span><span class="special">());</span> 3359 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3360 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 3361 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special"><</span> <span class="identifier">capacity</span><span class="special">());</span> <span class="comment">// Room for add.</span> 3362 <span class="special">})</span> 3363 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3364 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_count</span> <span class="special">+</span> <span class="number">1</span><span class="special">);</span> <span class="comment">// Count inc.</span> 3365 <span class="comment">// Second to last item.</span> 3366 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">items</span><span class="special">().</span><span class="identifier">at</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">-</span> <span class="number">1</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">item</span><span class="special">);</span> 3367 <span class="comment">// ...following skipped #ifndef AUDITS.</span> 3368 <span class="keyword">if</span><span class="special">(</span><span class="identifier">old_items</span><span class="special">)</span> <span class="identifier">all_equal</span><span class="special">(</span><span class="identifier">items</span><span class="special">(),</span> <span class="special">*</span><span class="identifier">old_items</span><span class="special">);</span> 3369 <span class="special">})</span> 3370 <span class="special">;</span> 3371 3372 <span class="identifier">items_</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">item</span><span class="special">);</span> 3373 <span class="special">}</span> 3374 3375<span class="keyword">private</span><span class="special">:</span> 3376 <span class="comment">// Contract helper.</span> 3377 <span class="keyword">static</span> <span class="keyword">bool</span> <span class="identifier">all_equal</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">left</span><span class="special">,</span> 3378 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">right</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="identifier">offset</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="special">{</span> 3379 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">function</span><span class="special">()</span> 3380 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 3381 <span class="comment">// Correct offset.</span> 3382 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">right</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">left</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">offset</span><span class="special">);</span> 3383 <span class="special">})</span> 3384 <span class="special">;</span> 3385 3386 <span class="keyword">for</span><span class="special">(</span><span class="keyword">unsigned</span> <span class="identifier">i</span> <span class="special">=</span> <span class="identifier">offset</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">right</span><span class="special">.</span><span class="identifier">size</span><span class="special">();</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="special">{</span> 3387 <span class="keyword">if</span><span class="special">(</span><span class="identifier">left</span><span class="special">.</span><span class="identifier">at</span><span class="special">(</span><span class="identifier">i</span> <span class="special">-</span> <span class="identifier">offset</span><span class="special">)</span> <span class="special">!=</span> <span class="identifier">right</span><span class="special">.</span><span class="identifier">at</span><span class="special">(</span><span class="identifier">i</span><span class="special">))</span> <span class="keyword">return</span> <span class="keyword">false</span><span class="special">;</span> 3388 <span class="special">}</span> 3389 <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span> 3390 <span class="special">}</span> 3391 3392 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="identifier">items_</span><span class="special">;</span> 3393<span class="special">};</span> 3394 3395<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 3396 <span class="identifier">simple_queue</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">q</span><span class="special">(</span><span class="number">10</span><span class="special">);</span> 3397 <span class="identifier">q</span><span class="special">.</span><span class="identifier">put</span><span class="special">(</span><span class="number">123</span><span class="special">);</span> 3398 <span class="identifier">q</span><span class="special">.</span><span class="identifier">put</span><span class="special">(</span><span class="number">456</span><span class="special">);</span> 3399 3400 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">q</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="number">10</span><span class="special">);</span> 3401 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">q</span><span class="special">.</span><span class="identifier">head</span><span class="special">()</span> <span class="special">==</span> <span class="number">123</span><span class="special">);</span> 3402 3403 <span class="identifier">assert</span><span class="special">(!</span><span class="identifier">q</span><span class="special">.</span><span class="identifier">is_empty</span><span class="special">());</span> 3404 <span class="identifier">assert</span><span class="special">(!</span><span class="identifier">q</span><span class="special">.</span><span class="identifier">is_full</span><span class="special">());</span> 3405 3406 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">items</span> <span class="special">=</span> <span class="identifier">q</span><span class="special">.</span><span class="identifier">items</span><span class="special">();</span> 3407 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">items</span><span class="special">.</span><span class="identifier">at</span><span class="special">(</span><span class="number">0</span><span class="special">)</span> <span class="special">==</span> <span class="number">123</span><span class="special">);</span> 3408 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">items</span><span class="special">.</span><span class="identifier">at</span><span class="special">(</span><span class="number">1</span><span class="special">)</span> <span class="special">==</span> <span class="number">456</span><span class="special">);</span> 3409 3410 <span class="identifier">q</span><span class="special">.</span><span class="identifier">remove</span><span class="special">();</span> 3411 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">q</span><span class="special">.</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span> 3412 3413 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 3414<span class="special">}</span> 3415</pre> 3416<p> 3417 </p> 3418</div> 3419<div class="section"> 3420<div class="titlepage"><div><div><h3 class="title"> 3421<a name="boost_contract.examples.__mitchell02___customer_manager__contracts_instead_of_defensive_programming"></a><a class="link" href="examples.html#boost_contract.examples.__mitchell02___customer_manager__contracts_instead_of_defensive_programming" title="[Mitchell02] Customer Manager: Contracts instead of defensive programming">[Mitchell02] 3422 Customer Manager: Contracts instead of defensive programming</a> 3423</h3></div></div></div> 3424<p> 3425</p> 3426<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 3427<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">string</span><span class="special">></span> 3428<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">map</span><span class="special">></span> 3429<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">utility</span><span class="special">></span> 3430<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 3431 3432<span class="comment">// Basic customer information.</span> 3433<span class="keyword">struct</span> <span class="identifier">customer_info</span> <span class="special">{</span> 3434 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">customer_manager</span><span class="special">;</span> 3435 3436 <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">identifier</span><span class="special">;</span> 3437 3438 <span class="identifier">identifier</span> <span class="identifier">id</span><span class="special">;</span> 3439 3440 <span class="keyword">explicit</span> <span class="identifier">customer_info</span><span class="special">(</span><span class="identifier">identifier</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">_id</span><span class="special">)</span> <span class="special">:</span> 3441 <span class="identifier">id</span><span class="special">(</span><span class="identifier">_id</span><span class="special">),</span> <span class="identifier">name_</span><span class="special">(),</span> <span class="identifier">address_</span><span class="special">(),</span> <span class="identifier">birthday_</span><span class="special">()</span> <span class="special">{}</span> 3442 3443<span class="keyword">private</span><span class="special">:</span> 3444 <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">name_</span><span class="special">;</span> 3445 <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">address_</span><span class="special">;</span> 3446 <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">birthday_</span><span class="special">;</span> 3447<span class="special">};</span> 3448 3449<span class="comment">// Manage customers.</span> 3450<span class="keyword">class</span> <span class="identifier">customer_manager</span> <span class="special">{</span> 3451 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 3452 3453 <span class="keyword">void</span> <span class="identifier">invariant</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3454 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> <span class="comment">// Non-negative count.</span> 3455 <span class="special">}</span> 3456 3457<span class="keyword">public</span><span class="special">:</span> 3458 <span class="comment">/* Creation */</span> 3459 3460 <span class="identifier">customer_manager</span><span class="special">()</span> <span class="special">{</span> 3461 <span class="comment">// Check invariants.</span> 3462 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3463 <span class="special">}</span> 3464 3465 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">customer_manager</span><span class="special">()</span> <span class="special">{</span> 3466 <span class="comment">// Check invariants.</span> 3467 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3468 <span class="special">}</span> 3469 3470 <span class="comment">/* Basic Queries */</span> 3471 3472 <span class="keyword">int</span> <span class="identifier">count</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3473 <span class="comment">// Check invariants.</span> 3474 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3475 <span class="keyword">return</span> <span class="identifier">customers_</span><span class="special">.</span><span class="identifier">size</span><span class="special">();</span> 3476 <span class="special">}</span> 3477 3478 <span class="keyword">bool</span> <span class="identifier">id_active</span><span class="special">(</span><span class="identifier">customer_info</span><span class="special">::</span><span class="identifier">identifier</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">id</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> 3479 <span class="comment">// Check invariants.</span> 3480 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3481 <span class="keyword">return</span> <span class="identifier">customers_</span><span class="special">.</span><span class="identifier">find</span><span class="special">(</span><span class="identifier">id</span><span class="special">)</span> <span class="special">!=</span> <span class="identifier">customers_</span><span class="special">.</span><span class="identifier">cend</span><span class="special">();</span> 3482 <span class="special">}</span> 3483 3484 <span class="comment">/* Derived Queries */</span> 3485 3486 <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">name_for</span><span class="special">(</span><span class="identifier">customer_info</span><span class="special">::</span><span class="identifier">identifier</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">id</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> 3487 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3488 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 3489 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">id_active</span><span class="special">(</span><span class="identifier">id</span><span class="special">));</span> <span class="comment">// Active.</span> 3490 <span class="special">})</span> 3491 <span class="special">;</span> 3492 3493 <span class="comment">// Find != end because of preconditions (no defensive programming).</span> 3494 <span class="keyword">return</span> <span class="identifier">customers_</span><span class="special">.</span><span class="identifier">find</span><span class="special">(</span><span class="identifier">id</span><span class="special">)-></span><span class="identifier">second</span><span class="special">.</span><span class="identifier">name_</span><span class="special">;</span> 3495 <span class="special">}</span> 3496 3497 <span class="comment">/* Commands */</span> 3498 3499 <span class="keyword">void</span> <span class="identifier">add</span><span class="special">(</span><span class="identifier">customer_info</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">info</span><span class="special">)</span> <span class="special">{</span> 3500 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">old_count</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">count</span><span class="special">());</span> 3501 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3502 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 3503 <span class="comment">// Not already active.</span> 3504 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">id_active</span><span class="special">(</span><span class="identifier">info</span><span class="special">.</span><span class="identifier">id</span><span class="special">));</span> 3505 <span class="special">})</span> 3506 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3507 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_count</span> <span class="special">+</span> <span class="number">1</span><span class="special">);</span> <span class="comment">// Count inc.</span> 3508 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">id_active</span><span class="special">(</span><span class="identifier">info</span><span class="special">.</span><span class="identifier">id</span><span class="special">));</span> <span class="comment">// Activated.</span> 3509 <span class="special">})</span> 3510 <span class="special">;</span> 3511 3512 <span class="identifier">customers_</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">make_pair</span><span class="special">(</span><span class="identifier">info</span><span class="special">.</span><span class="identifier">id</span><span class="special">,</span> <span class="identifier">customer</span><span class="special">(</span><span class="identifier">info</span><span class="special">)));</span> 3513 <span class="special">}</span> 3514 3515 <span class="keyword">void</span> <span class="identifier">set_name</span><span class="special">(</span><span class="identifier">customer_info</span><span class="special">::</span><span class="identifier">identifier</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">id</span><span class="special">,</span> 3516 <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">name</span><span class="special">)</span> <span class="special">{</span> 3517 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3518 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 3519 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">id_active</span><span class="special">(</span><span class="identifier">id</span><span class="special">));</span> <span class="comment">// Already active.</span> 3520 <span class="special">})</span> 3521 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3522 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">name_for</span><span class="special">(</span><span class="identifier">id</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">name</span><span class="special">);</span> <span class="comment">// Name set.</span> 3523 <span class="special">})</span> 3524 <span class="special">;</span> 3525 3526 <span class="comment">// Find != end because of precondition (no defensive programming).</span> 3527 <span class="identifier">customers_</span><span class="special">.</span><span class="identifier">find</span><span class="special">(</span><span class="identifier">id</span><span class="special">)-></span><span class="identifier">second</span><span class="special">.</span><span class="identifier">name_</span> <span class="special">=</span> <span class="identifier">name</span><span class="special">;</span> 3528 <span class="special">}</span> 3529 3530<span class="keyword">private</span><span class="special">:</span> 3531 <span class="keyword">class</span> <span class="identifier">agent</span> <span class="special">{};</span> <span class="comment">// Customer agent.</span> 3532 3533 <span class="keyword">struct</span> <span class="identifier">customer</span> <span class="special">:</span> <span class="identifier">customer_info</span> <span class="special">{</span> 3534 <span class="identifier">agent</span> <span class="identifier">managing_agent</span><span class="special">;</span> 3535 <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">last_contact</span><span class="special">;</span> 3536 3537 <span class="keyword">explicit</span> <span class="identifier">customer</span><span class="special">(</span><span class="identifier">customer_info</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">info</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">customer_info</span><span class="special">(</span><span class="identifier">info</span><span class="special">),</span> 3538 <span class="identifier">managing_agent</span><span class="special">(),</span> <span class="identifier">last_contact</span><span class="special">()</span> <span class="special">{}</span> 3539 <span class="special">};</span> 3540 3541 <span class="identifier">std</span><span class="special">::</span><span class="identifier">map</span><span class="special"><</span><span class="identifier">customer_info</span><span class="special">::</span><span class="identifier">identifier</span><span class="special">,</span> <span class="identifier">customer</span><span class="special">></span> <span class="identifier">customers_</span><span class="special">;</span> 3542<span class="special">};</span> 3543 3544<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 3545 <span class="identifier">customer_manager</span> <span class="identifier">m</span><span class="special">;</span> 3546 <span class="identifier">customer_info</span> <span class="keyword">const</span> <span class="identifier">js</span><span class="special">(</span><span class="string">"john_smith_123"</span><span class="special">);</span> 3547 <span class="identifier">m</span><span class="special">.</span><span class="identifier">add</span><span class="special">(</span><span class="identifier">js</span><span class="special">);</span> 3548 <span class="identifier">m</span><span class="special">.</span><span class="identifier">set_name</span><span class="special">(</span><span class="identifier">js</span><span class="special">.</span><span class="identifier">id</span><span class="special">,</span> <span class="string">"John Smith"</span><span class="special">);</span> 3549 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">m</span><span class="special">.</span><span class="identifier">name_for</span><span class="special">(</span><span class="identifier">js</span><span class="special">.</span><span class="identifier">id</span><span class="special">)</span> <span class="special">==</span> <span class="string">"John Smith"</span><span class="special">);</span> 3550 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">m</span><span class="special">.</span><span class="identifier">count</span><span class="special">()</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span> 3551 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">m</span><span class="special">.</span><span class="identifier">id_active</span><span class="special">(</span><span class="identifier">js</span><span class="special">.</span><span class="identifier">id</span><span class="special">));</span> 3552 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 3553<span class="special">}</span> 3554</pre> 3555<p> 3556 </p> 3557</div> 3558<div class="section"> 3559<div class="titlepage"><div><div><h3 class="title"> 3560<a name="boost_contract.examples.__mitchell02___observer__pure_virtual_functions"></a><a class="link" href="examples.html#boost_contract.examples.__mitchell02___observer__pure_virtual_functions" title="[Mitchell02] Observer: Pure virtual functions">[Mitchell02] 3561 Observer: Pure virtual functions</a> 3562</h3></div></div></div> 3563<p> 3564</p> 3565<pre class="programlisting"><span class="preprocessor">#ifndef</span> <span class="identifier">OBSERVER_HPP_</span> 3566<span class="preprocessor">#define</span> <span class="identifier">OBSERVER_HPP_</span> 3567 3568<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 3569<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 3570 3571<span class="comment">// Observer.</span> 3572<span class="keyword">class</span> <span class="identifier">observer</span> <span class="special">{</span> 3573 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">subject</span><span class="special">;</span> 3574<span class="keyword">public</span><span class="special">:</span> 3575 <span class="comment">// No inv and no bases so contracts optional if no pre, post, and override.</span> 3576 3577 <span class="comment">/* Creation */</span> 3578 3579 <span class="identifier">observer</span><span class="special">()</span> <span class="special">{</span> 3580 <span class="comment">// Could have omitted contracts here (nothing to check).</span> 3581 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3582 <span class="special">}</span> 3583 3584 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">observer</span><span class="special">()</span> <span class="special">{</span> 3585 <span class="comment">// Could have omitted contracts here (nothing to check).</span> 3586 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3587 <span class="special">}</span> 3588 3589 <span class="comment">/* Commands */</span> 3590 3591 <span class="comment">// If up-to-date with related subject.</span> 3592 <span class="keyword">virtual</span> <span class="keyword">bool</span> <span class="identifier">up_to_date_with_subject</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> 3593 <span class="keyword">const</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> 3594 3595 <span class="comment">// Update this observer.</span> 3596 <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">update</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> 3597<span class="special">};</span> 3598 3599<span class="keyword">bool</span> <span class="identifier">observer</span><span class="special">::</span><span class="identifier">up_to_date_with_subject</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> 3600 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="keyword">this</span><span class="special">);</span> 3601 <span class="identifier">assert</span><span class="special">(</span><span class="keyword">false</span><span class="special">);</span> 3602 <span class="keyword">return</span> <span class="keyword">false</span><span class="special">;</span> 3603<span class="special">}</span> 3604 3605<span class="keyword">void</span> <span class="identifier">observer</span><span class="special">::</span><span class="identifier">update</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span><span class="special">)</span> <span class="special">{</span> 3606 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="keyword">this</span><span class="special">)</span> 3607 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3608 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">up_to_date_with_subject</span><span class="special">());</span> <span class="comment">// Up-to-date.</span> 3609 <span class="special">})</span> 3610 <span class="special">;</span> 3611 <span class="identifier">assert</span><span class="special">(</span><span class="keyword">false</span><span class="special">);</span> 3612<span class="special">}</span> 3613 3614<span class="preprocessor">#endif</span> <span class="comment">// #include guard</span> 3615</pre> 3616<p> 3617 </p> 3618<p> 3619</p> 3620<pre class="programlisting"><span class="preprocessor">#ifndef</span> <span class="identifier">SUBJECT_HPP_</span> 3621<span class="preprocessor">#define</span> <span class="identifier">SUBJECT_HPP_</span> 3622 3623<span class="preprocessor">#include</span> <span class="string">"observer.hpp"</span> 3624<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 3625<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">vector</span><span class="special">></span> 3626<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">algorithm</span><span class="special">></span> 3627<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 3628 3629<span class="comment">// Subject for observer design pattern.</span> 3630<span class="keyword">class</span> <span class="identifier">subject</span> <span class="special">{</span> 3631 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 3632 3633 <span class="keyword">void</span> <span class="identifier">invariant</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3634 <span class="identifier">BOOST_CONTRACT_ASSERT_AUDIT</span><span class="special">(</span><span class="identifier">all_observers_valid</span><span class="special">(</span><span class="identifier">observers</span><span class="special">()));</span> <span class="comment">// Valid.</span> 3635 <span class="special">}</span> 3636 3637<span class="keyword">public</span><span class="special">:</span> 3638 <span class="comment">/* Creation */</span> 3639 3640 <span class="comment">// Construct subject with no observer.</span> 3641 <span class="identifier">subject</span><span class="special">()</span> <span class="special">{</span> 3642 <span class="comment">// Check invariant.</span> 3643 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3644 <span class="special">}</span> 3645 3646 <span class="comment">// Destroy subject.</span> 3647 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">subject</span><span class="special">()</span> <span class="special">{</span> 3648 <span class="comment">// Check invariant.</span> 3649 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3650 <span class="special">}</span> 3651 3652 <span class="comment">/* Queries */</span> 3653 3654 <span class="comment">// If given object is attached.</span> 3655 <span class="keyword">bool</span> <span class="identifier">attached</span><span class="special">(</span><span class="identifier">observer</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">ob</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> 3656 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3657 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 3658 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">ob</span><span class="special">);</span> <span class="comment">// Not null.</span> 3659 <span class="special">})</span> 3660 <span class="special">;</span> 3661 3662 <span class="keyword">return</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">find</span><span class="special">(</span><span class="identifier">observers_</span><span class="special">.</span><span class="identifier">cbegin</span><span class="special">(),</span> <span class="identifier">observers_</span><span class="special">.</span><span class="identifier">cend</span><span class="special">(),</span> <span class="identifier">ob</span><span class="special">)</span> <span class="special">!=</span> 3663 <span class="identifier">observers_</span><span class="special">.</span><span class="identifier">cend</span><span class="special">();</span> 3664 <span class="special">}</span> 3665 3666 <span class="comment">/* Commands */</span> 3667 3668 <span class="comment">// Attach given object as an observer.</span> 3669 <span class="keyword">void</span> <span class="identifier">attach</span><span class="special">(</span><span class="identifier">observer</span><span class="special">*</span> <span class="identifier">ob</span><span class="special">)</span> <span class="special">{</span> 3670 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">observer</span> <span class="keyword">const</span><span class="special">*></span> <span class="special">></span> <span class="identifier">old_observers</span><span class="special">;</span> 3671 <span class="preprocessor">#ifdef</span> <span class="identifier">BOOST_CONTRACT_AUDITS</span> 3672 <span class="identifier">old_observers</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">observers</span><span class="special">());</span> 3673 <span class="preprocessor">#endif</span> 3674 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3675 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 3676 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">ob</span><span class="special">);</span> <span class="comment">// Not null.</span> 3677 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">attached</span><span class="special">(</span><span class="identifier">ob</span><span class="special">));</span> <span class="comment">// Not already attached.</span> 3678 <span class="special">})</span> 3679 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3680 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">attached</span><span class="special">(</span><span class="identifier">ob</span><span class="special">));</span> <span class="comment">// Attached.</span> 3681 <span class="comment">// Others not changed (frame rule).</span> 3682 <span class="identifier">BOOST_CONTRACT_ASSERT_AUDIT</span><span class="special">(</span><span class="identifier">other_observers_unchanged</span><span class="special">(</span> 3683 <span class="special">*</span><span class="identifier">old_observers</span><span class="special">,</span> <span class="identifier">observers</span><span class="special">(),</span> <span class="identifier">ob</span><span class="special">));</span> 3684 <span class="special">})</span> 3685 <span class="special">;</span> 3686 3687 <span class="identifier">observers_</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">ob</span><span class="special">);</span> 3688 <span class="special">}</span> 3689 3690<span class="keyword">protected</span><span class="special">:</span> 3691 <span class="comment">// Contracts could have been omitted for protected/private with no pre/post.</span> 3692 3693 <span class="comment">/* Queries */</span> 3694 3695 <span class="comment">// All observers attached to this subject.</span> 3696 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">observer</span> <span class="keyword">const</span><span class="special">*></span> <span class="identifier">observers</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3697 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">observer</span> <span class="keyword">const</span><span class="special">*></span> <span class="identifier">obs</span><span class="special">;</span> 3698 <span class="keyword">for</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">observer</span><span class="special">*>::</span><span class="identifier">const_iterator</span> <span class="identifier">i</span> <span class="special">=</span> <span class="identifier">observers_</span><span class="special">.</span><span class="identifier">cbegin</span><span class="special">();</span> 3699 <span class="identifier">i</span> <span class="special">!=</span> <span class="identifier">observers_</span><span class="special">.</span><span class="identifier">cend</span><span class="special">();</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="special">{</span> 3700 <span class="identifier">obs</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(*</span><span class="identifier">i</span><span class="special">);</span> 3701 <span class="special">}</span> 3702 <span class="keyword">return</span> <span class="identifier">obs</span><span class="special">;</span> 3703 <span class="special">}</span> 3704 3705 <span class="comment">/* Commands */</span> 3706 3707 <span class="comment">// Update all attached observers.</span> 3708 <span class="keyword">void</span> <span class="identifier">notify</span><span class="special">()</span> <span class="special">{</span> 3709 <span class="comment">// Protected members use `function` (no inv and no subcontracting).</span> 3710 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">function</span><span class="special">()</span> 3711 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3712 <span class="comment">// All updated.</span> 3713 <span class="identifier">BOOST_CONTRACT_ASSERT_AUDIT</span><span class="special">(</span><span class="identifier">all_observers_updated</span><span class="special">(</span><span class="identifier">observers</span><span class="special">()));</span> 3714 <span class="special">})</span> 3715 <span class="special">;</span> 3716 3717 <span class="keyword">for</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">observer</span><span class="special">*>::</span><span class="identifier">iterator</span> <span class="identifier">i</span> <span class="special">=</span> <span class="identifier">observers_</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> 3718 <span class="identifier">i</span> <span class="special">!=</span> <span class="identifier">observers_</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="special">{</span> 3719 <span class="comment">// Class invariants ensure no null pointers in observers but class</span> 3720 <span class="comment">// invariants not checked for non-public functions so assert here.</span> 3721 <span class="identifier">assert</span><span class="special">(*</span><span class="identifier">i</span><span class="special">);</span> <span class="comment">// Pointer not null (defensive programming).</span> 3722 <span class="special">(*</span><span class="identifier">i</span><span class="special">)-></span><span class="identifier">update</span><span class="special">();</span> 3723 <span class="special">}</span> 3724 <span class="special">}</span> 3725 3726<span class="keyword">private</span><span class="special">:</span> 3727 <span class="comment">/* Contract Helpers */</span> 3728 3729 <span class="keyword">static</span> <span class="keyword">bool</span> <span class="identifier">all_observers_valid</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">observer</span> <span class="keyword">const</span><span class="special">*></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">obs</span><span class="special">)</span> <span class="special">{</span> 3730 <span class="keyword">for</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">observer</span> <span class="keyword">const</span><span class="special">*>::</span><span class="identifier">const_iterator</span> <span class="identifier">i</span> <span class="special">=</span> <span class="identifier">obs</span><span class="special">.</span><span class="identifier">cbegin</span><span class="special">();</span> 3731 <span class="identifier">i</span> <span class="special">!=</span> <span class="identifier">obs</span><span class="special">.</span><span class="identifier">cend</span><span class="special">();</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="special">{</span> 3732 <span class="keyword">if</span><span class="special">(!*</span><span class="identifier">i</span><span class="special">)</span> <span class="keyword">return</span> <span class="keyword">false</span><span class="special">;</span> 3733 <span class="special">}</span> 3734 <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span> 3735 <span class="special">}</span> 3736 3737 <span class="keyword">static</span> <span class="keyword">bool</span> <span class="identifier">other_observers_unchanged</span><span class="special">(</span> 3738 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">observer</span> <span class="keyword">const</span><span class="special">*></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">old_obs</span><span class="special">,</span> 3739 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">observer</span> <span class="keyword">const</span><span class="special">*></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">new_obs</span><span class="special">,</span> 3740 <span class="identifier">observer</span> <span class="keyword">const</span><span class="special">*</span> <span class="identifier">ob</span> 3741 <span class="special">)</span> <span class="special">{</span> 3742 <span class="comment">// Private members use `function` (no inv and no subcontracting).</span> 3743 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">function</span><span class="special">()</span> 3744 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 3745 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">ob</span><span class="special">);</span> <span class="comment">// Not null.</span> 3746 <span class="special">})</span> 3747 <span class="special">;</span> 3748 3749 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">observer</span> <span class="keyword">const</span><span class="special">*></span> <span class="identifier">remaining</span> <span class="special">=</span> <span class="identifier">new_obs</span><span class="special">;</span> 3750 <span class="identifier">std</span><span class="special">::</span><span class="identifier">remove</span><span class="special">(</span><span class="identifier">remaining</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">remaining</span><span class="special">.</span><span class="identifier">end</span><span class="special">(),</span> <span class="identifier">ob</span><span class="special">);</span> 3751 3752 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">observer</span> <span class="keyword">const</span><span class="special">*>::</span><span class="identifier">const_iterator</span> <span class="identifier">remaining_it</span> <span class="special">=</span> 3753 <span class="identifier">remaining</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> 3754 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">observer</span> <span class="keyword">const</span><span class="special">*>::</span><span class="identifier">const_iterator</span> <span class="identifier">old_it</span> <span class="special">=</span> <span class="identifier">old_obs</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> 3755 <span class="keyword">while</span><span class="special">(</span><span class="identifier">remaining</span><span class="special">.</span><span class="identifier">cend</span><span class="special">()</span> <span class="special">!=</span> <span class="identifier">remaining_it</span> <span class="special">&&</span> <span class="identifier">old_obs</span><span class="special">.</span><span class="identifier">cend</span><span class="special">()</span> <span class="special">!=</span> <span class="identifier">old_it</span><span class="special">)</span> <span class="special">{</span> 3756 <span class="keyword">if</span><span class="special">(*</span><span class="identifier">remaining_it</span> <span class="special">!=</span> <span class="special">*</span><span class="identifier">old_it</span><span class="special">)</span> <span class="keyword">return</span> <span class="keyword">false</span><span class="special">;</span> 3757 <span class="special">++</span><span class="identifier">remaining_it</span><span class="special">;</span> 3758 <span class="special">++</span><span class="identifier">old_it</span><span class="special">;</span> 3759 <span class="special">}</span> 3760 <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span> 3761 <span class="special">}</span> 3762 3763 <span class="keyword">static</span> <span class="keyword">bool</span> <span class="identifier">all_observers_updated</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">observer</span> <span class="keyword">const</span><span class="special">*></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">obs</span><span class="special">)</span> <span class="special">{</span> 3764 <span class="keyword">for</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">observer</span> <span class="keyword">const</span><span class="special">*>::</span><span class="identifier">const_iterator</span> <span class="identifier">i</span> <span class="special">=</span> <span class="identifier">obs</span><span class="special">.</span><span class="identifier">cbegin</span><span class="special">();</span> 3765 <span class="identifier">i</span> <span class="special">!=</span> <span class="identifier">obs</span><span class="special">.</span><span class="identifier">cend</span><span class="special">();</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="special">{</span> 3766 <span class="keyword">if</span><span class="special">(!*</span><span class="identifier">i</span><span class="special">)</span> <span class="keyword">return</span> <span class="keyword">false</span><span class="special">;</span> 3767 <span class="keyword">if</span><span class="special">(!(*</span><span class="identifier">i</span><span class="special">)-></span><span class="identifier">up_to_date_with_subject</span><span class="special">())</span> <span class="keyword">return</span> <span class="keyword">false</span><span class="special">;</span> 3768 <span class="special">}</span> 3769 <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span> 3770 <span class="special">}</span> 3771 3772 <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">observer</span><span class="special">*></span> <span class="identifier">observers_</span><span class="special">;</span> 3773<span class="special">};</span> 3774 3775<span class="preprocessor">#endif</span> <span class="comment">// #include guard</span> 3776</pre> 3777<p> 3778 </p> 3779<p> 3780</p> 3781<pre class="programlisting"><span class="preprocessor">#include</span> <span class="string">"observer/observer.hpp"</span> 3782<span class="preprocessor">#include</span> <span class="string">"observer/subject.hpp"</span> 3783<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 3784<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 3785 3786<span class="keyword">int</span> <span class="identifier">test_state</span><span class="special">;</span> <span class="comment">// For testing only.</span> 3787 3788<span class="comment">// Implement an actual subject.</span> 3789<span class="keyword">class</span> <span class="identifier">concrete_subject</span> 3790 <span class="preprocessor">#define</span> <span class="identifier">BASES</span> <span class="keyword">public</span> <span class="identifier">subject</span> 3791 <span class="special">:</span> <span class="identifier">BASES</span> 3792<span class="special">{</span> 3793 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 3794 3795 <span class="keyword">typedef</span> <span class="identifier">BOOST_CONTRACT_BASE_TYPES</span><span class="special">(</span><span class="identifier">BASES</span><span class="special">)</span> <span class="identifier">base_types</span><span class="special">;</span> <span class="comment">// Subcontracting.</span> 3796 <span class="preprocessor">#undef</span> <span class="identifier">BASES</span> 3797 3798<span class="keyword">public</span><span class="special">:</span> 3799 <span class="keyword">typedef</span> <span class="keyword">int</span> <span class="identifier">state</span><span class="special">;</span> <span class="comment">// Some state being observed.</span> 3800 3801 <span class="identifier">concrete_subject</span><span class="special">()</span> <span class="special">:</span> <span class="identifier">state_</span><span class="special">()</span> <span class="special">{</span> 3802 <span class="comment">// Could have omitted contracts here (nothing to check).</span> 3803 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3804 <span class="special">}</span> 3805 3806 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">concrete_subject</span><span class="special">()</span> <span class="special">{</span> 3807 <span class="comment">// Could have omitted contracts here (nothing to check).</span> 3808 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3809 <span class="special">}</span> 3810 3811 <span class="keyword">void</span> <span class="identifier">set_state</span><span class="special">(</span><span class="identifier">state</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">new_state</span><span class="special">)</span> <span class="special">{</span> 3812 <span class="comment">// Could have omitted contracts here (nothing to check).</span> 3813 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3814 3815 <span class="identifier">state_</span> <span class="special">=</span> <span class="identifier">new_state</span><span class="special">;</span> 3816 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">state_</span> <span class="special">==</span> <span class="identifier">test_state</span><span class="special">);</span> 3817 <span class="identifier">notify</span><span class="special">();</span> <span class="comment">// Notify all observers.</span> 3818 <span class="special">}</span> 3819 3820 <span class="identifier">state</span> <span class="identifier">get_state</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3821 <span class="comment">// Could have omitted contracts here (nothing to check).</span> 3822 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3823 <span class="keyword">return</span> <span class="identifier">state_</span><span class="special">;</span> 3824 <span class="special">}</span> 3825 3826<span class="keyword">private</span><span class="special">:</span> 3827 <span class="identifier">state</span> <span class="identifier">state_</span><span class="special">;</span> 3828<span class="special">};</span> 3829 3830<span class="comment">// Implement an actual observer.</span> 3831<span class="keyword">class</span> <span class="identifier">concrete_observer</span> 3832 <span class="preprocessor">#define</span> <span class="identifier">BASES</span> <span class="keyword">public</span> <span class="identifier">observer</span> 3833 <span class="special">:</span> <span class="identifier">BASES</span> 3834<span class="special">{</span> 3835 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 3836 3837 <span class="keyword">typedef</span> <span class="identifier">BOOST_CONTRACT_BASE_TYPES</span><span class="special">(</span><span class="identifier">BASES</span><span class="special">)</span> <span class="identifier">base_types</span><span class="special">;</span> <span class="comment">// Subcontracting.</span> 3838 <span class="preprocessor">#undef</span> <span class="identifier">BASES</span> 3839 3840 <span class="identifier">BOOST_CONTRACT_OVERRIDES</span><span class="special">(</span><span class="identifier">up_to_date_with_subject</span><span class="special">,</span> <span class="identifier">update</span><span class="special">)</span> 3841 3842<span class="keyword">public</span><span class="special">:</span> 3843 <span class="comment">// Create concrete observer.</span> 3844 <span class="keyword">explicit</span> <span class="identifier">concrete_observer</span><span class="special">(</span><span class="identifier">concrete_subject</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">subj</span><span class="special">)</span> <span class="special">:</span> 3845 <span class="identifier">subject_</span><span class="special">(</span><span class="identifier">subj</span><span class="special">),</span> <span class="identifier">observed_state_</span><span class="special">()</span> <span class="special">{</span> 3846 <span class="comment">// Could have omitted contracts here (nothing to check).</span> 3847 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3848 <span class="special">}</span> 3849 3850 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">concrete_observer</span><span class="special">()</span> <span class="special">{</span> 3851 <span class="comment">// Could have omitted contracts here (nothing to check).</span> 3852 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3853 <span class="special">}</span> 3854 3855 <span class="comment">// Implement base virtual functions.</span> 3856 3857 <span class="keyword">bool</span> <span class="identifier">up_to_date_with_subject</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> 3858 <span class="keyword">const</span> <span class="comment">/* override */</span> <span class="special">{</span> 3859 <span class="keyword">bool</span> <span class="identifier">result</span><span class="special">;</span> 3860 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special"><</span> 3861 <span class="identifier">override_up_to_date_with_subject</span> 3862 <span class="special">>(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">result</span><span class="special">,</span> <span class="special">&</span><span class="identifier">concrete_observer</span><span class="special">::</span><span class="identifier">up_to_date_with_subject</span><span class="special">,</span> <span class="keyword">this</span><span class="special">);</span> 3863 3864 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">;</span> <span class="comment">// For simplicity, assume always up-to-date.</span> 3865 <span class="special">}</span> 3866 3867 <span class="keyword">void</span> <span class="identifier">update</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="comment">/* override */</span> <span class="special">{</span> 3868 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special"><</span> 3869 <span class="identifier">override_update</span><span class="special">>(</span><span class="identifier">v</span><span class="special">,</span> <span class="special">&</span><span class="identifier">concrete_observer</span><span class="special">::</span><span class="identifier">update</span><span class="special">,</span> <span class="keyword">this</span><span class="special">);</span> 3870 3871 <span class="identifier">observed_state_</span> <span class="special">=</span> <span class="identifier">subject_</span><span class="special">.</span><span class="identifier">get_state</span><span class="special">();</span> 3872 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">observed_state_</span> <span class="special">==</span> <span class="identifier">test_state</span><span class="special">);</span> 3873 <span class="special">}</span> 3874 3875<span class="keyword">private</span><span class="special">:</span> 3876 <span class="identifier">concrete_subject</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">subject_</span><span class="special">;</span> 3877 <span class="identifier">concrete_subject</span><span class="special">::</span><span class="identifier">state</span> <span class="identifier">observed_state_</span><span class="special">;</span> 3878<span class="special">};</span> 3879 3880<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 3881 <span class="identifier">concrete_subject</span> <span class="identifier">subj</span><span class="special">;</span> 3882 <span class="identifier">concrete_observer</span> <span class="identifier">ob</span><span class="special">(</span><span class="identifier">subj</span><span class="special">);</span> 3883 <span class="identifier">subj</span><span class="special">.</span><span class="identifier">attach</span><span class="special">(&</span><span class="identifier">ob</span><span class="special">);</span> 3884 3885 <span class="identifier">subj</span><span class="special">.</span><span class="identifier">set_state</span><span class="special">(</span><span class="identifier">test_state</span> <span class="special">=</span> <span class="number">123</span><span class="special">);</span> 3886 <span class="identifier">subj</span><span class="special">.</span><span class="identifier">set_state</span><span class="special">(</span><span class="identifier">test_state</span> <span class="special">=</span> <span class="number">456</span><span class="special">);</span> 3887 3888 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 3889<span class="special">}</span> 3890</pre> 3891<p> 3892 </p> 3893</div> 3894<div class="section"> 3895<div class="titlepage"><div><div><h3 class="title"> 3896<a name="boost_contract.examples.__mitchell02___counter__subcontracting"></a><a name="Mitchell02_counter_anchor"></a><a class="link" href="examples.html#boost_contract.examples.__mitchell02___counter__subcontracting" title="[Mitchell02] Counter: Subcontracting">[Mitchell02] 3897 Counter: Subcontracting</a> 3898</h3></div></div></div> 3899<p> 3900</p> 3901<pre class="programlisting"><span class="preprocessor">#ifndef</span> <span class="identifier">PUSH_BUTTON_HPP_</span> 3902<span class="preprocessor">#define</span> <span class="identifier">PUSH_BUTTON_HPP_</span> 3903 3904<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 3905<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 3906 3907<span class="keyword">class</span> <span class="identifier">push_button</span> <span class="special">{</span> 3908<span class="keyword">public</span><span class="special">:</span> 3909 <span class="comment">// No inv and no bases so contracts optional if no pre, post, and override.</span> 3910 3911 <span class="comment">/* Creation */</span> 3912 3913 <span class="comment">// Create an enabled button.</span> 3914 <span class="identifier">push_button</span><span class="special">()</span> <span class="special">:</span> <span class="identifier">enabled_</span><span class="special">(</span><span class="keyword">true</span><span class="special">)</span> <span class="special">{</span> 3915 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3916 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3917 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">enabled</span><span class="special">());</span> <span class="comment">// Enabled.</span> 3918 <span class="special">})</span> 3919 <span class="special">;</span> 3920 <span class="special">}</span> 3921 3922 <span class="comment">// Destroy button.</span> 3923 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">push_button</span><span class="special">()</span> <span class="special">{</span> 3924 <span class="comment">// Could have omitted contracts here (nothing to check).</span> 3925 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3926 <span class="special">}</span> 3927 3928 <span class="comment">/* Queries */</span> 3929 3930 <span class="comment">// If button is enabled.</span> 3931 <span class="keyword">bool</span> <span class="identifier">enabled</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 3932 <span class="comment">// Could have omitted contracts here (nothing to check).</span> 3933 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 3934 <span class="keyword">return</span> <span class="identifier">enabled_</span><span class="special">;</span> 3935 <span class="special">}</span> 3936 3937 <span class="comment">/* Commands */</span> 3938 3939 <span class="comment">// Enable button.</span> 3940 <span class="keyword">void</span> <span class="identifier">enable</span><span class="special">()</span> <span class="special">{</span> 3941 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3942 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3943 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">enabled</span><span class="special">());</span> <span class="comment">// Enabled.</span> 3944 <span class="special">})</span> 3945 <span class="special">;</span> 3946 3947 <span class="identifier">enabled_</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">;</span> 3948 <span class="special">}</span> 3949 3950 <span class="comment">// Disable button.</span> 3951 <span class="keyword">void</span> <span class="identifier">disable</span><span class="special">()</span> <span class="special">{</span> 3952 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 3953 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 3954 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">enabled</span><span class="special">());</span> <span class="comment">// Disabled.</span> 3955 <span class="special">})</span> 3956 <span class="special">;</span> 3957 3958 <span class="identifier">enabled_</span> <span class="special">=</span> <span class="keyword">false</span><span class="special">;</span> 3959 <span class="special">}</span> 3960 3961 <span class="comment">// Invoke externally when button clicked.</span> 3962 <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">on_bn_clicked</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> 3963 3964<span class="keyword">private</span><span class="special">:</span> 3965 <span class="keyword">bool</span> <span class="identifier">enabled_</span><span class="special">;</span> 3966<span class="special">};</span> 3967 3968<span class="keyword">void</span> <span class="identifier">push_button</span><span class="special">::</span><span class="identifier">on_bn_clicked</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span><span class="special">)</span> <span class="special">{</span> 3969 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="keyword">this</span><span class="special">)</span> 3970 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 3971 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">enabled</span><span class="special">());</span> <span class="comment">// Enabled.</span> 3972 <span class="special">})</span> 3973 <span class="special">;</span> 3974 <span class="identifier">assert</span><span class="special">(</span><span class="keyword">false</span><span class="special">);</span> 3975<span class="special">}</span> 3976 3977<span class="preprocessor">#endif</span> <span class="comment">// #include guard</span> 3978</pre> 3979<p> 3980 </p> 3981<p> 3982</p> 3983<pre class="programlisting"><span class="preprocessor">#ifndef</span> <span class="identifier">DECREMENT_BUTTON_HPP_</span> 3984<span class="preprocessor">#define</span> <span class="identifier">DECREMENT_BUTTON_HPP_</span> 3985 3986<span class="preprocessor">#include</span> <span class="string">"push_button.hpp"</span> 3987<span class="preprocessor">#include</span> <span class="string">"counter.hpp"</span> 3988<span class="preprocessor">#include</span> <span class="string">"../observer/observer.hpp"</span> 3989<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 3990<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">noncopyable</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 3991 3992<span class="keyword">class</span> <span class="identifier">decrement_button</span> 3993 <span class="preprocessor">#define</span> <span class="identifier">BASES</span> <span class="keyword">public</span> <span class="identifier">push_button</span><span class="special">,</span> <span class="keyword">public</span> <span class="identifier">observer</span><span class="special">,</span> <span class="special">\</span> 3994 <span class="keyword">private</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">noncopyable</span> 3995 <span class="special">:</span> <span class="identifier">BASES</span> 3996<span class="special">{</span> 3997 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 3998 3999 <span class="keyword">typedef</span> <span class="identifier">BOOST_CONTRACT_BASE_TYPES</span><span class="special">(</span><span class="identifier">BASES</span><span class="special">)</span> <span class="identifier">base_types</span><span class="special">;</span> 4000 <span class="preprocessor">#undef</span> <span class="identifier">BASES</span> 4001 4002 <span class="identifier">BOOST_CONTRACT_OVERRIDES</span><span class="special">(</span><span class="identifier">on_bn_clicked</span><span class="special">,</span> <span class="identifier">up_to_date_with_subject</span><span class="special">,</span> <span class="identifier">update</span><span class="special">);</span> 4003 4004<span class="keyword">public</span><span class="special">:</span> 4005 <span class="comment">/* Creation */</span> 4006 4007 <span class="keyword">explicit</span> <span class="identifier">decrement_button</span><span class="special">(</span><span class="identifier">counter</span><span class="special">&</span> <span class="identifier">a_counter</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">counter_</span><span class="special">(</span><span class="identifier">a_counter</span><span class="special">)</span> <span class="special">{</span> 4008 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 4009 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4010 <span class="comment">// Enable iff positive value.</span> 4011 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">enabled</span><span class="special">()</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">a_counter</span><span class="special">.</span><span class="identifier">value</span><span class="special">()</span> <span class="special">></span> <span class="number">0</span><span class="special">));</span> 4012 <span class="special">})</span> 4013 <span class="special">;</span> 4014 <span class="identifier">counter_</span><span class="special">.</span><span class="identifier">attach</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4015 <span class="special">}</span> 4016 4017 <span class="comment">// Destroy button.</span> 4018 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">decrement_button</span><span class="special">()</span> <span class="special">{</span> 4019 <span class="comment">// Could have omitted contracts here (nothing to check).</span> 4020 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4021 <span class="special">}</span> 4022 4023 <span class="comment">/* Commands */</span> 4024 4025 <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">on_bn_clicked</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> 4026 <span class="comment">/* override */</span> <span class="special">{</span> 4027 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">old_value</span> <span class="special">=</span> 4028 <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">counter_</span><span class="special">.</span><span class="identifier">value</span><span class="special">());</span> 4029 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special"><</span> 4030 <span class="identifier">override_on_bn_clicked</span> 4031 <span class="special">>(</span><span class="identifier">v</span><span class="special">,</span> <span class="special">&</span><span class="identifier">decrement_button</span><span class="special">::</span><span class="identifier">on_bn_clicked</span><span class="special">,</span> <span class="keyword">this</span><span class="special">)</span> 4032 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4033 <span class="comment">// Counter decremented.</span> 4034 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">counter_</span><span class="special">.</span><span class="identifier">value</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_value</span> <span class="special">-</span> <span class="number">1</span><span class="special">);</span> 4035 <span class="special">})</span> 4036 <span class="special">;</span> 4037 <span class="identifier">counter_</span><span class="special">.</span><span class="identifier">decrement</span><span class="special">();</span> 4038 <span class="special">}</span> 4039 4040 <span class="keyword">virtual</span> <span class="keyword">bool</span> <span class="identifier">up_to_date_with_subject</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> 4041 <span class="keyword">const</span> <span class="comment">/* override */</span> <span class="special">{</span> 4042 <span class="keyword">bool</span> <span class="identifier">result</span><span class="special">;</span> 4043 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special"><</span> 4044 <span class="identifier">override_up_to_date_with_subject</span> 4045 <span class="special">>(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">result</span><span class="special">,</span> <span class="special">&</span><span class="identifier">decrement_button</span><span class="special">::</span><span class="identifier">up_to_date_with_subject</span><span class="special">,</span> <span class="keyword">this</span><span class="special">);</span> 4046 4047 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">;</span> <span class="comment">// For simplicity, assume always up-to-date.</span> 4048 <span class="special">}</span> 4049 4050 <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">update</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="comment">/* override */</span> <span class="special">{</span> 4051 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special"><</span> 4052 <span class="identifier">override_update</span><span class="special">>(</span><span class="identifier">v</span><span class="special">,</span> <span class="special">&</span><span class="identifier">decrement_button</span><span class="special">::</span><span class="identifier">update</span><span class="special">,</span> <span class="keyword">this</span><span class="special">)</span> 4053 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4054 <span class="comment">// Enabled iff positive value.</span> 4055 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">enabled</span><span class="special">()</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">counter_</span><span class="special">.</span><span class="identifier">value</span><span class="special">()</span> <span class="special">></span> <span class="number">0</span><span class="special">));</span> 4056 <span class="special">})</span> 4057 <span class="special">;</span> 4058 4059 <span class="keyword">if</span><span class="special">(</span><span class="identifier">counter_</span><span class="special">.</span><span class="identifier">value</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">)</span> <span class="identifier">disable</span><span class="special">();</span> 4060 <span class="keyword">else</span> <span class="identifier">enable</span><span class="special">();</span> 4061 <span class="special">}</span> 4062 4063<span class="keyword">private</span><span class="special">:</span> 4064 <span class="identifier">counter</span><span class="special">&</span> <span class="identifier">counter_</span><span class="special">;</span> 4065<span class="special">};</span> 4066 4067<span class="preprocessor">#endif</span> <span class="comment">// #include guard</span> 4068</pre> 4069<p> 4070 </p> 4071<p> 4072</p> 4073<pre class="programlisting"><span class="preprocessor">#ifndef</span> <span class="identifier">COUNTER_HPP_</span> 4074<span class="preprocessor">#define</span> <span class="identifier">COUNTER_HPP_</span> 4075 4076<span class="preprocessor">#include</span> <span class="string">"../observer/subject.hpp"</span> 4077<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 4078 4079<span class="keyword">class</span> <span class="identifier">counter</span> 4080 <span class="preprocessor">#define</span> <span class="identifier">BASES</span> <span class="keyword">public</span> <span class="identifier">subject</span> 4081 <span class="special">:</span> <span class="identifier">BASES</span> 4082<span class="special">{</span> 4083 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 4084 4085 <span class="keyword">typedef</span> <span class="identifier">BOOST_CONTRACT_BASE_TYPES</span><span class="special">(</span><span class="identifier">BASES</span><span class="special">)</span> <span class="identifier">base_types</span><span class="special">;</span> 4086 <span class="preprocessor">#undef</span> <span class="identifier">BASES</span> 4087 4088<span class="keyword">public</span><span class="special">:</span> 4089 <span class="comment">/* Creation */</span> 4090 4091 <span class="comment">// Construct counter with specified value.</span> 4092 <span class="keyword">explicit</span> <span class="identifier">counter</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">a_value</span> <span class="special">=</span> <span class="number">10</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">value_</span><span class="special">(</span><span class="identifier">a_value</span><span class="special">)</span> <span class="special">{</span> 4093 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 4094 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4095 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">value</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">a_value</span><span class="special">);</span> <span class="comment">// Value set.</span> 4096 <span class="special">})</span> 4097 <span class="special">;</span> 4098 <span class="special">}</span> 4099 4100 <span class="comment">// Destroy counter.</span> 4101 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">counter</span><span class="special">()</span> <span class="special">{</span> 4102 <span class="comment">// Could have omitted contracts here (nothing to check).</span> 4103 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4104 <span class="special">}</span> 4105 4106 <span class="comment">/* Queries */</span> 4107 4108 <span class="comment">// Current counter value.</span> 4109 <span class="keyword">int</span> <span class="identifier">value</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 4110 <span class="comment">// Could have omitted contracts here (nothing to check).</span> 4111 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4112 <span class="keyword">return</span> <span class="identifier">value_</span><span class="special">;</span> 4113 <span class="special">}</span> 4114 4115 <span class="comment">/* Commands */</span> 4116 4117 <span class="comment">// Decrement counter value.</span> 4118 <span class="keyword">void</span> <span class="identifier">decrement</span><span class="special">()</span> <span class="special">{</span> 4119 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">old_value</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">value</span><span class="special">());</span> 4120 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 4121 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4122 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">value</span><span class="special">()</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_value</span> <span class="special">-</span> <span class="number">1</span><span class="special">);</span> <span class="comment">// Decrement.</span> 4123 <span class="special">})</span> 4124 <span class="special">;</span> 4125 4126 <span class="special">--</span><span class="identifier">value_</span><span class="special">;</span> 4127 <span class="identifier">notify</span><span class="special">();</span> <span class="comment">// Notify all attached observers.</span> 4128 <span class="special">}</span> 4129 4130<span class="keyword">private</span><span class="special">:</span> 4131 <span class="keyword">int</span> <span class="identifier">value_</span><span class="special">;</span> 4132<span class="special">};</span> 4133 4134<span class="preprocessor">#endif</span> <span class="comment">// #include guard</span> 4135</pre> 4136<p> 4137 </p> 4138<p> 4139</p> 4140<pre class="programlisting"><span class="preprocessor">#include</span> <span class="string">"counter/counter.hpp"</span> 4141<span class="preprocessor">#include</span> <span class="string">"counter/decrement_button.hpp"</span> 4142<span class="preprocessor">#include</span> <span class="string">"observer/observer.hpp"</span> 4143<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 4144 4145<span class="keyword">int</span> <span class="identifier">test_counter</span><span class="special">;</span> 4146 4147<span class="keyword">class</span> <span class="identifier">view_of_counter</span> 4148 <span class="preprocessor">#define</span> <span class="identifier">BASES</span> <span class="keyword">public</span> <span class="identifier">observer</span> 4149 <span class="special">:</span> <span class="identifier">BASES</span> 4150<span class="special">{</span> 4151 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 4152 4153 <span class="keyword">typedef</span> <span class="identifier">BOOST_CONTRACT_BASE_TYPES</span><span class="special">(</span><span class="identifier">BASES</span><span class="special">)</span> <span class="identifier">base_types</span><span class="special">;</span> 4154 <span class="preprocessor">#undef</span> <span class="identifier">BASES</span> 4155 4156 <span class="identifier">BOOST_CONTRACT_OVERRIDES</span><span class="special">(</span><span class="identifier">up_to_date_with_subject</span><span class="special">,</span> <span class="identifier">update</span><span class="special">)</span> 4157 4158<span class="keyword">public</span><span class="special">:</span> 4159 <span class="comment">/* Creation */</span> 4160 4161 <span class="comment">// Create view associated with given counter.</span> 4162 <span class="keyword">explicit</span> <span class="identifier">view_of_counter</span><span class="special">(</span><span class="identifier">counter</span><span class="special">&</span> <span class="identifier">a_counter</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">counter_</span><span class="special">(</span><span class="identifier">a_counter</span><span class="special">)</span> <span class="special">{</span> 4163 <span class="comment">// Could have omitted contracts here (nothing to check).</span> 4164 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4165 4166 <span class="identifier">counter_</span><span class="special">.</span><span class="identifier">attach</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4167 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">counter_</span><span class="special">.</span><span class="identifier">value</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">test_counter</span><span class="special">);</span> 4168 <span class="special">}</span> 4169 4170 <span class="comment">// Destroy view.</span> 4171 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">view_of_counter</span><span class="special">()</span> <span class="special">{</span> 4172 <span class="comment">// Could have omitted contracts here (nothing to check).</span> 4173 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4174 <span class="special">}</span> 4175 4176 <span class="comment">/* Commands */</span> 4177 4178 <span class="keyword">virtual</span> <span class="keyword">bool</span> <span class="identifier">up_to_date_with_subject</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> 4179 <span class="keyword">const</span> <span class="comment">/* override */</span> <span class="special">{</span> 4180 <span class="keyword">bool</span> <span class="identifier">result</span><span class="special">;</span> 4181 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special"><</span> 4182 <span class="identifier">override_up_to_date_with_subject</span> 4183 <span class="special">>(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">result</span><span class="special">,</span> <span class="special">&</span><span class="identifier">view_of_counter</span><span class="special">::</span><span class="identifier">up_to_date_with_subject</span><span class="special">,</span> <span class="keyword">this</span><span class="special">);</span> 4184 4185 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">;</span> <span class="comment">// For simplicity, assume always up-to-date.</span> 4186 <span class="special">}</span> 4187 4188 <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">update</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="comment">/* override */</span> <span class="special">{</span> 4189 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special"><</span> 4190 <span class="identifier">override_update</span><span class="special">>(</span><span class="identifier">v</span><span class="special">,</span> <span class="special">&</span><span class="identifier">view_of_counter</span><span class="special">::</span><span class="identifier">update</span><span class="special">,</span> <span class="keyword">this</span><span class="special">);</span> 4191 4192 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">counter_</span><span class="special">.</span><span class="identifier">value</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">test_counter</span><span class="special">);</span> 4193 <span class="special">}</span> 4194 4195<span class="keyword">private</span><span class="special">:</span> 4196 <span class="identifier">counter</span><span class="special">&</span> <span class="identifier">counter_</span><span class="special">;</span> 4197<span class="special">};</span> 4198 4199<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 4200 <span class="identifier">counter</span> <span class="identifier">cnt</span><span class="special">(</span><span class="identifier">test_counter</span> <span class="special">=</span> <span class="number">1</span><span class="special">);</span> 4201 <span class="identifier">view_of_counter</span> <span class="identifier">view</span><span class="special">(</span><span class="identifier">cnt</span><span class="special">);</span> 4202 4203 <span class="identifier">decrement_button</span> <span class="identifier">dec</span><span class="special">(</span><span class="identifier">cnt</span><span class="special">);</span> 4204 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">dec</span><span class="special">.</span><span class="identifier">enabled</span><span class="special">());</span> 4205 4206 <span class="identifier">test_counter</span><span class="special">--;</span> 4207 <span class="identifier">dec</span><span class="special">.</span><span class="identifier">on_bn_clicked</span><span class="special">();</span> 4208 <span class="identifier">assert</span><span class="special">(!</span><span class="identifier">dec</span><span class="special">.</span><span class="identifier">enabled</span><span class="special">());</span> 4209 4210 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 4211<span class="special">}</span> 4212</pre> 4213<p> 4214 </p> 4215</div> 4216<div class="section"> 4217<div class="titlepage"><div><div><h3 class="title"> 4218<a name="boost_contract.examples.__cline90___vector__comparison_with_a___proposal_syntax"></a><a name="Cline90_vector_anchor"></a><a class="link" href="examples.html#boost_contract.examples.__cline90___vector__comparison_with_a___proposal_syntax" title="[Cline90] Vector: Comparison with A++ proposal syntax">[Cline90] 4219 Vector: Comparison with A++ proposal syntax</a> 4220</h3></div></div></div> 4221<div class="informaltable"><table class="table"> 4222<colgroup> 4223<col> 4224<col> 4225</colgroup> 4226<thead><tr> 4227<th> 4228 <p> 4229 This Library 4230 </p> 4231 </th> 4232<th> 4233 <p> 4234 A++ Proposal (never actually implemented) 4235 </p> 4236 </th> 4237</tr></thead> 4238<tbody> 4239<tr> 4240<td> 4241 <p> 4242</p> 4243<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#ifndef</span> <span class="identifier">VECTOR_HPP_</span> 4244<span class="preprocessor">#define</span> <span class="identifier">VECTOR_HPP_</span> 4245 4246<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 4247 4248<span class="comment">// NOTE: Incomplete contract assertions, addressing only `size`.</span> 4249<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 4250<span class="keyword">class</span> <span class="identifier">vector</span> 4251 <span class="preprocessor">#define</span> <span class="identifier">BASES</span> <span class="keyword">private</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor_precondition</span><span class="special"><</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">></span> 4252 <span class="special">:</span> <span class="identifier">BASES</span> 4253<span class="special">{</span> 4254 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 4255 4256 <span class="keyword">typedef</span> <span class="identifier">BOOST_CONTRACT_BASE_TYPES</span><span class="special">(</span><span class="identifier">BASES</span><span class="special">)</span> <span class="identifier">base_types</span><span class="special">;</span> 4257 <span class="preprocessor">#undef</span> <span class="identifier">BASES</span> 4258 4259 <span class="keyword">void</span> <span class="identifier">invariant</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 4260 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> 4261 <span class="special">}</span> 4262 4263<span class="keyword">public</span><span class="special">:</span> 4264 <span class="keyword">explicit</span> <span class="identifier">vector</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">count</span> <span class="special">=</span> <span class="number">10</span><span class="special">)</span> <span class="special">:</span> 4265 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor_precondition</span><span class="special"><</span><span class="identifier">vector</span><span class="special">>([&]</span> <span class="special">{</span> 4266 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> 4267 <span class="special">}),</span> 4268 <span class="identifier">data_</span><span class="special">(</span><span class="keyword">new</span> <span class="identifier">T</span><span class="special">[</span><span class="identifier">count</span><span class="special">]),</span> 4269 <span class="identifier">size_</span><span class="special">(</span><span class="identifier">count</span><span class="special">)</span> 4270 <span class="special">{</span> 4271 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 4272 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4273 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">count</span><span class="special">);</span> 4274 <span class="special">})</span> 4275 <span class="special">;</span> 4276 4277 <span class="keyword">for</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">size_</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="identifier">data_</span><span class="special">[</span><span class="identifier">i</span><span class="special">]</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">();</span> 4278 <span class="special">}</span> 4279 4280 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">vector</span><span class="special">()</span> <span class="special">{</span> 4281 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4282 <span class="keyword">delete</span><span class="special">[]</span> <span class="identifier">data_</span><span class="special">;</span> 4283 <span class="special">}</span> 4284 4285 <span class="keyword">int</span> <span class="identifier">size</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 4286 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4287 <span class="keyword">return</span> <span class="identifier">size_</span><span class="special">;</span> <span class="comment">// Non-negative result already checked by invariant.</span> 4288 <span class="special">}</span> 4289 4290 <span class="keyword">void</span> <span class="identifier">resize</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">count</span><span class="special">)</span> <span class="special">{</span> 4291 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 4292 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 4293 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> 4294 <span class="special">})</span> 4295 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4296 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">count</span><span class="special">);</span> 4297 <span class="special">})</span> 4298 <span class="special">;</span> 4299 4300 <span class="identifier">T</span><span class="special">*</span> <span class="identifier">slice</span> <span class="special">=</span> <span class="keyword">new</span> <span class="identifier">T</span><span class="special">[</span><span class="identifier">count</span><span class="special">];</span> 4301 <span class="keyword">for</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">count</span> <span class="special">&&</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">size_</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="identifier">slice</span><span class="special">[</span><span class="identifier">i</span><span class="special">]</span> <span class="special">=</span> <span class="identifier">data_</span><span class="special">[</span><span class="identifier">i</span><span class="special">];</span> 4302 <span class="keyword">delete</span><span class="special">[]</span> <span class="identifier">data_</span><span class="special">;</span> 4303 <span class="identifier">data_</span> <span class="special">=</span> <span class="identifier">slice</span><span class="special">;</span> 4304 <span class="identifier">size_</span> <span class="special">=</span> <span class="identifier">count</span><span class="special">;</span> 4305 <span class="special">}</span> 4306 4307 <span class="identifier">T</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">[](</span><span class="keyword">int</span> <span class="identifier">index</span><span class="special">)</span> <span class="special">{</span> 4308 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 4309 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 4310 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">index</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> 4311 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">index</span> <span class="special"><</span> <span class="identifier">size</span><span class="special">());</span> 4312 <span class="special">})</span> 4313 <span class="special">;</span> 4314 4315 <span class="keyword">return</span> <span class="identifier">data_</span><span class="special">[</span><span class="identifier">index</span><span class="special">];</span> 4316 <span class="special">}</span> 4317 4318 <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">[](</span><span class="keyword">int</span> <span class="identifier">index</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> 4319 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 4320 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 4321 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">index</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> 4322 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">index</span> <span class="special"><</span> <span class="identifier">size</span><span class="special">());</span> 4323 <span class="special">})</span> 4324 <span class="special">;</span> 4325 4326 <span class="keyword">return</span> <span class="identifier">data_</span><span class="special">[</span><span class="identifier">index</span><span class="special">];</span> 4327 <span class="special">}</span> 4328 4329<span class="keyword">private</span><span class="special">:</span> 4330 <span class="identifier">T</span><span class="special">*</span> <span class="identifier">data_</span><span class="special">;</span> 4331 <span class="keyword">int</span> <span class="identifier">size_</span><span class="special">;</span> 4332<span class="special">};</span> 4333 4334<span class="preprocessor">#endif</span> <span class="comment">// #include guard</span> 4335</pre> 4336<p> 4337 </p> 4338 </td> 4339<td> 4340 <p> 4341</p> 4342<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="comment">// Extra spaces, newlines, etc. for visual alignment with this library code.</span> 4343 4344 4345 4346 4347 4348<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 4349<span class="keyword">class</span> <span class="identifier">vector</span> <span class="special">{</span> 4350 4351 4352 4353 4354 4355 4356 4357 4358<span class="identifier">legal</span><span class="special">:</span> <span class="comment">// Class invariants (legal).</span> 4359 <span class="identifier">size</span><span class="special">()</span> <span class="special">>=</span> <span class="number">0</span><span class="special">;</span> 4360 4361 4362<span class="keyword">public</span><span class="special">:</span> 4363 <span class="keyword">explicit</span> <span class="identifier">vector</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">count</span> <span class="special">=</span> <span class="number">10</span><span class="special">)</span> <span class="special">:</span> 4364 <span class="identifier">data_</span><span class="special">(</span><span class="keyword">new</span> <span class="identifier">T</span><span class="special">[</span><span class="identifier">count</span><span class="special">]),</span> 4365 <span class="identifier">size_</span><span class="special">(</span><span class="identifier">count</span><span class="special">)</span> 4366 <span class="special">{</span> 4367 <span class="keyword">for</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">size_</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="identifier">data_</span><span class="special">[</span><span class="identifier">i</span><span class="special">]</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">();</span> 4368 <span class="special">}</span> 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">vector</span><span class="special">()</span> <span class="special">{</span> <span class="keyword">delete</span><span class="special">[]</span> <span class="identifier">data_</span><span class="special">;</span> <span class="special">}</span> 4380 4381 4382 4383 4384 <span class="keyword">int</span> <span class="identifier">size</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">size_</span><span class="special">;</span> <span class="special">}</span> 4385 4386 4387 4388 4389 <span class="keyword">void</span> <span class="identifier">resize</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">count</span><span class="special">)</span> <span class="special">{</span> 4390 <span class="identifier">T</span><span class="special">*</span> <span class="identifier">slice</span> <span class="special">=</span> <span class="keyword">new</span> <span class="identifier">T</span><span class="special">[</span><span class="identifier">count</span><span class="special">];</span> 4391 <span class="keyword">for</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">count</span> <span class="special">&&</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">size_</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="identifier">slice</span><span class="special">[</span><span class="identifier">i</span><span class="special">]</span> <span class="special">=</span> <span class="identifier">data_</span><span class="special">[</span><span class="identifier">i</span><span class="special">];</span> 4392 <span class="keyword">delete</span><span class="special">[]</span> <span class="identifier">data_</span><span class="special">;</span> 4393 <span class="identifier">data_</span> <span class="special">=</span> <span class="identifier">slice</span><span class="special">;</span> 4394 <span class="identifier">size_</span> <span class="special">=</span> <span class="identifier">count</span><span class="special">;</span> 4395 <span class="special">}</span> 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 <span class="identifier">T</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">[](</span><span class="keyword">int</span> <span class="identifier">index</span><span class="special">)</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">data_</span><span class="special">[</span><span class="identifier">index</span><span class="special">];</span> <span class="special">}</span> 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 <span class="identifier">T</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">[](</span><span class="keyword">int</span> <span class="identifier">index</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">data_</span><span class="special">[</span><span class="identifier">index</span><span class="special">];</span> <span class="special">}</span> 4418 4419 4420 4421 4422<span class="identifier">axioms</span><span class="special">:</span> <span class="comment">// Preconditions (require) and postconditions (promise) for each func.</span> 4423 <span class="special">[</span><span class="keyword">int</span> <span class="identifier">count</span><span class="special">;</span> <span class="identifier">require</span> <span class="identifier">count</span> <span class="special">>=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">promise</span> <span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">count</span><span class="special">]</span> <span class="identifier">vector</span><span class="special">(</span><span class="identifier">count</span><span class="special">);</span> 4424 <span class="special">[</span><span class="keyword">int</span> <span class="identifier">count</span><span class="special">;</span> <span class="identifier">require</span> <span class="identifier">count</span> <span class="special">>=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">promise</span> <span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">count</span><span class="special">]</span> <span class="identifier">resize</span><span class="special">(</span><span class="identifier">count</span><span class="special">);</span> 4425 <span class="special">[</span><span class="keyword">int</span> <span class="identifier">index</span><span class="special">;</span> <span class="identifier">require</span> <span class="identifier">index</span> <span class="special">>=</span> <span class="number">0</span> <span class="special">&&</span> <span class="identifier">index</span> <span class="special"><</span> <span class="identifier">size</span><span class="special">()]</span> <span class="special">(*</span><span class="keyword">this</span><span class="special">)[</span><span class="identifier">x</span><span class="special">];</span> <span class="comment">// Op[].</span> 4426 <span class="special">[</span><span class="keyword">int</span> <span class="identifier">index</span><span class="special">;</span> <span class="identifier">require</span> <span class="identifier">index</span> <span class="special">>=</span> <span class="number">0</span> <span class="special">&&</span> <span class="identifier">index</span> <span class="special"><</span> <span class="identifier">size</span><span class="special">()]</span> <span class="special">(*</span><span class="keyword">this</span><span class="special">)[</span><span class="identifier">x</span><span class="special">]</span> <span class="keyword">const</span><span class="special">;</span> <span class="comment">// Op[].</span> 4427 4428<span class="keyword">private</span><span class="special">:</span> 4429 <span class="identifier">T</span><span class="special">*</span> <span class="identifier">data_</span><span class="special">;</span> 4430 <span class="keyword">int</span> <span class="identifier">size_</span><span class="special">;</span> 4431<span class="special">};</span> 4432 4433<span class="comment">// End.</span> 4434</pre> 4435<p> 4436 </p> 4437 </td> 4438</tr> 4439<tr> 4440<td> 4441 <p> 4442</p> 4443<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#include</span> <span class="string">"vector.hpp"</span> 4444<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 4445 4446<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 4447 <span class="identifier">vector</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">v</span> <span class="special">(</span><span class="number">3</span><span class="special">);</span> 4448 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">v</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="number">3</span><span class="special">);</span> 4449 4450 <span class="identifier">v</span><span class="special">[</span><span class="number">0</span><span class="special">]</span> <span class="special">=</span> <span class="number">123</span><span class="special">;</span> 4451 <span class="identifier">v</span><span class="special">.</span><span class="identifier">resize</span><span class="special">(</span><span class="number">2</span><span class="special">);</span> 4452 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">v</span><span class="special">[</span><span class="number">0</span><span class="special">]</span> <span class="special">==</span> <span class="number">123</span><span class="special">);</span> 4453 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">v</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span> <span class="special">==</span> <span class="number">2</span><span class="special">);</span> 4454 4455 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 4456<span class="special">}</span> 4457</pre> 4458<p> 4459 </p> 4460 </td> 4461<td> 4462 </td> 4463</tr> 4464</tbody> 4465</table></div> 4466</div> 4467<div class="section"> 4468<div class="titlepage"><div><div><h3 class="title"> 4469<a name="boost_contract.examples.__cline90___stack__stack_like_container"></a><a class="link" href="examples.html#boost_contract.examples.__cline90___stack__stack_like_container" title="[Cline90] Stack: Stack-like container">[Cline90] 4470 Stack: Stack-like container</a> 4471</h3></div></div></div> 4472<p> 4473</p> 4474<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 4475<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 4476 4477<span class="comment">// NOTE: Incomplete contract assertions, addressing only `empty` and `full`.</span> 4478<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 4479<span class="keyword">class</span> <span class="identifier">stack</span> 4480 <span class="preprocessor">#define</span> <span class="identifier">BASES</span> <span class="keyword">private</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor_precondition</span><span class="special"><</span><span class="identifier">stack</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">></span> 4481 <span class="special">:</span> <span class="identifier">BASES</span> 4482<span class="special">{</span> 4483 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 4484 4485 <span class="keyword">typedef</span> <span class="identifier">BOOST_CONTRACT_BASE_TYPES</span><span class="special">(</span><span class="identifier">BASES</span><span class="special">)</span> <span class="identifier">base_types</span><span class="special">;</span> 4486 <span class="preprocessor">#undef</span> <span class="identifier">BASES</span> 4487 4488<span class="keyword">public</span><span class="special">:</span> 4489 <span class="keyword">explicit</span> <span class="identifier">stack</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">capacity</span><span class="special">)</span> <span class="special">:</span> 4490 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor_precondition</span><span class="special"><</span><span class="identifier">stack</span><span class="special">>([&]</span> <span class="special">{</span> 4491 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">capacity</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> 4492 <span class="special">}),</span> 4493 <span class="identifier">data_</span><span class="special">(</span><span class="keyword">new</span> <span class="identifier">T</span><span class="special">[</span><span class="identifier">capacity</span><span class="special">]),</span> <span class="identifier">capacity_</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">),</span> <span class="identifier">size_</span><span class="special">(</span><span class="number">0</span><span class="special">)</span> 4494 <span class="special">{</span> 4495 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 4496 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4497 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">empty</span><span class="special">());</span> 4498 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">full</span><span class="special">()</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">capacity</span> <span class="special">==</span> <span class="number">0</span><span class="special">));</span> 4499 <span class="special">})</span> 4500 <span class="special">;</span> 4501 4502 <span class="keyword">for</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">capacity_</span><span class="special">;</span> <span class="special">++</span><span class="identifier">i</span><span class="special">)</span> <span class="identifier">data_</span><span class="special">[</span><span class="identifier">i</span><span class="special">]</span> <span class="special">=</span> <span class="identifier">T</span><span class="special">();</span> 4503 <span class="special">}</span> 4504 4505 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">stack</span><span class="special">()</span> <span class="special">{</span> 4506 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4507 <span class="keyword">delete</span><span class="special">[]</span> <span class="identifier">data_</span><span class="special">;</span> 4508 <span class="special">}</span> 4509 4510 <span class="keyword">bool</span> <span class="identifier">empty</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 4511 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4512 <span class="keyword">return</span> <span class="identifier">size_</span> <span class="special">==</span> <span class="number">0</span><span class="special">;</span> 4513 <span class="special">}</span> 4514 4515 <span class="keyword">bool</span> <span class="identifier">full</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 4516 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4517 <span class="keyword">return</span> <span class="identifier">size_</span> <span class="special">==</span> <span class="identifier">capacity_</span><span class="special">;</span> 4518 <span class="special">}</span> 4519 4520 <span class="keyword">void</span> <span class="identifier">push</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">)</span> <span class="special">{</span> 4521 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 4522 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 4523 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">full</span><span class="special">());</span> 4524 <span class="special">})</span> 4525 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4526 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">());</span> 4527 <span class="special">})</span> 4528 <span class="special">;</span> 4529 4530 <span class="identifier">data_</span><span class="special">[</span><span class="identifier">size_</span><span class="special">++]</span> <span class="special">=</span> <span class="identifier">value</span><span class="special">;</span> 4531 <span class="special">}</span> 4532 4533 <span class="identifier">T</span> <span class="identifier">pop</span><span class="special">()</span> <span class="special">{</span> 4534 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 4535 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 4536 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">());</span> 4537 <span class="special">})</span> 4538 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4539 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">full</span><span class="special">());</span> 4540 <span class="special">})</span> 4541 <span class="special">;</span> 4542 4543 <span class="keyword">return</span> <span class="identifier">data_</span><span class="special">[--</span><span class="identifier">size_</span><span class="special">];</span> 4544 <span class="special">}</span> 4545 4546<span class="keyword">private</span><span class="special">:</span> 4547 <span class="identifier">T</span><span class="special">*</span> <span class="identifier">data_</span><span class="special">;</span> 4548 <span class="keyword">int</span> <span class="identifier">capacity_</span><span class="special">;</span> 4549 <span class="keyword">int</span> <span class="identifier">size_</span><span class="special">;</span> 4550<span class="special">};</span> 4551 4552<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 4553 <span class="identifier">stack</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">s</span><span class="special">(</span><span class="number">3</span><span class="special">);</span> 4554 <span class="identifier">s</span><span class="special">.</span><span class="identifier">push</span><span class="special">(</span><span class="number">123</span><span class="special">);</span> 4555 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">pop</span><span class="special">()</span> <span class="special">==</span> <span class="number">123</span><span class="special">);</span> 4556 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 4557<span class="special">}</span> 4558</pre> 4559<p> 4560 </p> 4561</div> 4562<div class="section"> 4563<div class="titlepage"><div><div><h3 class="title"> 4564<a name="boost_contract.examples.__cline90___vector_stack__subcontracting"></a><a class="link" href="examples.html#boost_contract.examples.__cline90___vector_stack__subcontracting" title="[Cline90] Vector-Stack: Subcontracting">[Cline90] 4565 Vector-Stack: Subcontracting</a> 4566</h3></div></div></div> 4567<p> 4568</p> 4569<pre class="programlisting"><span class="preprocessor">#include</span> <span class="string">"vector.hpp"</span> 4570<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 4571<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">optional</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 4572<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 4573 4574<span class="comment">// NOTE: Incomplete contract assertions, addressing only `empty` and `full`.</span> 4575<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 4576<span class="keyword">class</span> <span class="identifier">abstract_stack</span> <span class="special">{</span> 4577<span class="keyword">public</span><span class="special">:</span> 4578 <span class="identifier">abstract_stack</span><span class="special">()</span> <span class="special">{</span> 4579 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 4580 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4581 <span class="comment">// AXIOM as empty() cannot actually be checked here to avoid</span> 4582 <span class="comment">// calling pure virtual function length() during construction).</span> 4583 <span class="identifier">BOOST_CONTRACT_ASSERT_AXIOM</span><span class="special">(</span><span class="identifier">empty</span><span class="special">());</span> 4584 <span class="special">})</span> 4585 <span class="special">;</span> 4586 <span class="special">}</span> 4587 4588 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">abstract_stack</span><span class="special">()</span> <span class="special">{</span> 4589 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4590 <span class="special">}</span> 4591 4592 <span class="keyword">bool</span> <span class="identifier">full</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 4593 <span class="keyword">bool</span> <span class="identifier">result</span><span class="special">;</span> 4594 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 4595 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4596 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">==</span> <span class="special">(</span><span class="identifier">length</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">capacity</span><span class="special">()));</span> 4597 <span class="special">})</span> 4598 <span class="special">;</span> 4599 4600 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">length</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">capacity</span><span class="special">());</span> 4601 <span class="special">}</span> 4602 4603 <span class="keyword">bool</span> <span class="identifier">empty</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 4604 <span class="keyword">bool</span> <span class="identifier">result</span><span class="special">;</span> 4605 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 4606 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4607 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">length</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">));</span> 4608 <span class="special">})</span> 4609 <span class="special">;</span> 4610 4611 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="special">(</span><span class="identifier">length</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span> 4612 <span class="special">}</span> 4613 4614 <span class="keyword">virtual</span> <span class="keyword">int</span> <span class="identifier">length</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> 4615 <span class="keyword">virtual</span> <span class="keyword">int</span> <span class="identifier">capacity</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> 4616 4617 <span class="keyword">virtual</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">item</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> 4618 4619 <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">push</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> 4620 <span class="keyword">virtual</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">pop</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> 4621 4622 <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">clear</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> 4623<span class="special">};</span> 4624 4625<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 4626<span class="keyword">int</span> <span class="identifier">abstract_stack</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">length</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> 4627 <span class="keyword">int</span> <span class="identifier">result</span><span class="special">;</span> 4628 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">result</span><span class="special">,</span> <span class="keyword">this</span><span class="special">)</span> 4629 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">(</span><span class="keyword">int</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 4630 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> 4631 <span class="special">})</span> 4632 <span class="special">;</span> 4633 <span class="identifier">assert</span><span class="special">(</span><span class="keyword">false</span><span class="special">);</span> 4634 <span class="keyword">return</span> <span class="identifier">result</span><span class="special">;</span> 4635<span class="special">}</span> 4636 4637<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 4638<span class="keyword">int</span> <span class="identifier">abstract_stack</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">capacity</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> 4639 <span class="keyword">int</span> <span class="identifier">result</span><span class="special">;</span> 4640 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">result</span><span class="special">,</span> <span class="keyword">this</span><span class="special">)</span> 4641 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">(</span><span class="keyword">int</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 4642 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> 4643 <span class="special">})</span> 4644 <span class="special">;</span> 4645 <span class="identifier">assert</span><span class="special">(</span><span class="keyword">false</span><span class="special">);</span> 4646 <span class="keyword">return</span> <span class="identifier">result</span><span class="special">;</span> 4647<span class="special">}</span> 4648 4649<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 4650<span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">abstract_stack</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">item</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> 4651 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&></span> <span class="identifier">result</span><span class="special">;</span> 4652 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">result</span><span class="special">,</span> <span class="keyword">this</span><span class="special">)</span> 4653 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 4654 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">());</span> 4655 <span class="special">})</span> 4656 <span class="special">;</span> 4657 <span class="identifier">assert</span><span class="special">(</span><span class="keyword">false</span><span class="special">);</span> 4658 <span class="keyword">return</span> <span class="special">*</span><span class="identifier">result</span><span class="special">;</span> 4659<span class="special">}</span> 4660 4661<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 4662<span class="keyword">void</span> <span class="identifier">abstract_stack</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">push</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span><span class="special">)</span> <span class="special">{</span> 4663 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="keyword">this</span><span class="special">)</span> 4664 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 4665 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">full</span><span class="special">());</span> 4666 <span class="special">})</span> 4667 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4668 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">());</span> 4669 <span class="special">})</span> 4670 <span class="special">;</span> 4671 <span class="identifier">assert</span><span class="special">(</span><span class="keyword">false</span><span class="special">);</span> 4672<span class="special">}</span> 4673 4674<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 4675<span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">abstract_stack</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">pop</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span><span class="special">)</span> <span class="special">{</span> 4676 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&></span> <span class="identifier">result</span><span class="special">;</span> 4677 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">old_ptr</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="identifier">old_item</span> <span class="special">=</span> <span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">item</span><span class="special">());</span> 4678 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">result</span><span class="special">,</span> <span class="keyword">this</span><span class="special">)</span> 4679 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 4680 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">empty</span><span class="special">());</span> 4681 <span class="special">})</span> 4682 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&></span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">result</span><span class="special">)</span> <span class="special">{</span> 4683 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(!</span><span class="identifier">full</span><span class="special">());</span> 4684 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(*</span><span class="identifier">result</span> <span class="special">==</span> <span class="special">*</span><span class="identifier">old_item</span><span class="special">);</span> 4685 <span class="special">})</span> 4686 <span class="special">;</span> 4687 <span class="identifier">assert</span><span class="special">(</span><span class="keyword">false</span><span class="special">);</span> 4688 <span class="keyword">return</span> <span class="special">*</span><span class="identifier">result</span><span class="special">;</span> 4689<span class="special">}</span> 4690 4691<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 4692<span class="keyword">void</span> <span class="identifier">abstract_stack</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">clear</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span><span class="special">)</span> <span class="special">{</span> 4693 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="keyword">this</span><span class="special">)</span> 4694 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4695 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">empty</span><span class="special">());</span> 4696 <span class="special">})</span> 4697 <span class="special">;</span> 4698 <span class="identifier">assert</span><span class="special">(</span><span class="keyword">false</span><span class="special">);</span> 4699<span class="special">}</span> 4700 4701<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span> 4702<span class="keyword">class</span> <span class="identifier">vstack</span> 4703 <span class="preprocessor">#define</span> <span class="identifier">BASES</span> <span class="keyword">private</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor_precondition</span><span class="special"><</span> <span class="special">\</span> 4704 <span class="identifier">vstack</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="special">>,</span> <span class="keyword">public</span> <span class="identifier">abstract_stack</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> 4705 <span class="special">:</span> <span class="identifier">BASES</span> 4706<span class="special">{</span> 4707 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 4708 4709 <span class="keyword">typedef</span> <span class="identifier">BOOST_CONTRACT_BASE_TYPES</span><span class="special">(</span><span class="identifier">BASES</span><span class="special">)</span> <span class="identifier">base_types</span><span class="special">;</span> 4710 <span class="preprocessor">#undef</span> <span class="identifier">BASES</span> 4711 4712 <span class="keyword">void</span> <span class="identifier">invariant</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 4713 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">length</span><span class="special">()</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> 4714 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">length</span><span class="special">()</span> <span class="special"><</span> <span class="identifier">capacity</span><span class="special">());</span> 4715 <span class="special">}</span> 4716 4717 <span class="identifier">BOOST_CONTRACT_OVERRIDES</span><span class="special">(</span><span class="identifier">length</span><span class="special">,</span> <span class="identifier">capacity</span><span class="special">,</span> <span class="identifier">item</span><span class="special">,</span> <span class="identifier">push</span><span class="special">,</span> <span class="identifier">pop</span><span class="special">,</span> <span class="identifier">clear</span><span class="special">)</span> 4718 4719<span class="keyword">public</span><span class="special">:</span> 4720 <span class="keyword">explicit</span> <span class="identifier">vstack</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">count</span> <span class="special">=</span> <span class="number">10</span><span class="special">)</span> <span class="special">:</span> 4721 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor_precondition</span><span class="special"><</span><span class="identifier">vstack</span><span class="special">>([&]</span> <span class="special">{</span> 4722 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">count</span> <span class="special">>=</span> <span class="number">0</span><span class="special">);</span> 4723 <span class="special">}),</span> 4724 <span class="identifier">vect_</span><span class="special">(</span><span class="identifier">count</span><span class="special">),</span> <span class="comment">// OK, executed after precondition so count >= 0.</span> 4725 <span class="identifier">len_</span><span class="special">(</span><span class="number">0</span><span class="special">)</span> 4726 <span class="special">{</span> 4727 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 4728 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4729 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">length</span><span class="special">()</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span> 4730 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">count</span><span class="special">);</span> 4731 <span class="special">})</span> 4732 <span class="special">;</span> 4733 <span class="special">}</span> 4734 4735 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">vstack</span><span class="special">()</span> <span class="special">{</span> 4736 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4737 <span class="special">}</span> 4738 4739 <span class="comment">// Inherited from abstract_stack.</span> 4740 4741 <span class="keyword">virtual</span> <span class="keyword">int</span> <span class="identifier">length</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">const</span> <span class="comment">/* override */</span> <span class="special">{</span> 4742 <span class="keyword">int</span> <span class="identifier">result</span><span class="special">;</span> 4743 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special"><</span> 4744 <span class="identifier">override_length</span><span class="special">>(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">result</span><span class="special">,</span> <span class="special">&</span><span class="identifier">vstack</span><span class="special">::</span><span class="identifier">length</span><span class="special">,</span> <span class="keyword">this</span><span class="special">);</span> 4745 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">len_</span><span class="special">;</span> 4746 <span class="special">}</span> 4747 4748 <span class="keyword">virtual</span> <span class="keyword">int</span> <span class="identifier">capacity</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> 4749 <span class="keyword">const</span> <span class="comment">/* override */</span> <span class="special">{</span> 4750 <span class="keyword">int</span> <span class="identifier">result</span><span class="special">;</span> 4751 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special"><</span> 4752 <span class="identifier">override_capacity</span><span class="special">>(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">result</span><span class="special">,</span> <span class="special">&</span><span class="identifier">vstack</span><span class="special">::</span><span class="identifier">capacity</span><span class="special">,</span> <span class="keyword">this</span><span class="special">);</span> 4753 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">vect_</span><span class="special">.</span><span class="identifier">size</span><span class="special">();</span> 4754 <span class="special">}</span> 4755 4756 <span class="keyword">virtual</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">item</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> 4757 <span class="keyword">const</span> <span class="comment">/* override */</span> <span class="special">{</span> 4758 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&></span> <span class="identifier">result</span><span class="special">;</span> 4759 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special"><</span> 4760 <span class="identifier">override_item</span><span class="special">>(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">result</span><span class="special">,</span> <span class="special">&</span><span class="identifier">vstack</span><span class="special">::</span><span class="identifier">item</span><span class="special">,</span> <span class="keyword">this</span><span class="special">);</span> 4761 <span class="keyword">return</span> <span class="special">*(</span><span class="identifier">result</span> <span class="special">=</span> <span class="identifier">vect_</span><span class="special">[</span><span class="identifier">len_</span> <span class="special">-</span> <span class="number">1</span><span class="special">]);</span> 4762 <span class="special">}</span> 4763 4764 <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">push</span><span class="special">(</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">value</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> 4765 <span class="comment">/* override */</span> <span class="special">{</span> 4766 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special"><</span> 4767 <span class="identifier">override_push</span><span class="special">>(</span><span class="identifier">v</span><span class="special">,</span> <span class="special">&</span><span class="identifier">vstack</span><span class="special">::</span><span class="identifier">push</span><span class="special">,</span> <span class="keyword">this</span><span class="special">,</span> <span class="identifier">value</span><span class="special">);</span> 4768 <span class="identifier">vect_</span><span class="special">[</span><span class="identifier">len_</span><span class="special">++]</span> <span class="special">=</span> <span class="identifier">value</span><span class="special">;</span> 4769 <span class="special">}</span> 4770 4771 <span class="keyword">virtual</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">pop</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="comment">/* override */</span> <span class="special">{</span> 4772 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special"><</span><span class="identifier">T</span> <span class="keyword">const</span><span class="special">&></span> <span class="identifier">result</span><span class="special">;</span> 4773 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special"><</span> 4774 <span class="identifier">override_pop</span><span class="special">>(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">result</span><span class="special">,</span> <span class="special">&</span><span class="identifier">vstack</span><span class="special">::</span><span class="identifier">pop</span><span class="special">,</span> <span class="keyword">this</span><span class="special">);</span> 4775 <span class="keyword">return</span> <span class="special">*(</span><span class="identifier">result</span> <span class="special">=</span> <span class="identifier">vect_</span><span class="special">[--</span><span class="identifier">len_</span><span class="special">]);</span> 4776 <span class="special">}</span> 4777 4778 <span class="keyword">virtual</span> <span class="keyword">void</span> <span class="identifier">clear</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">virtual_</span><span class="special">*</span> <span class="identifier">v</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="comment">/* override */</span> <span class="special">{</span> 4779 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special"><</span> 4780 <span class="identifier">override_clear</span><span class="special">>(</span><span class="identifier">v</span><span class="special">,</span> <span class="special">&</span><span class="identifier">vstack</span><span class="special">::</span><span class="identifier">clear</span><span class="special">,</span> <span class="keyword">this</span><span class="special">);</span> 4781 <span class="identifier">len_</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span> 4782 <span class="special">}</span> 4783 4784<span class="keyword">private</span><span class="special">:</span> 4785 <span class="identifier">vector</span><span class="special"><</span><span class="identifier">T</span><span class="special">></span> <span class="identifier">vect_</span><span class="special">;</span> 4786 <span class="keyword">int</span> <span class="identifier">len_</span><span class="special">;</span> 4787<span class="special">};</span> 4788 4789<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 4790 <span class="identifier">vstack</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">s</span><span class="special">(</span><span class="number">3</span><span class="special">);</span> 4791 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">capacity</span><span class="special">()</span> <span class="special">==</span> <span class="number">3</span><span class="special">);</span> 4792 4793 <span class="identifier">s</span><span class="special">.</span><span class="identifier">push</span><span class="special">(</span><span class="number">123</span><span class="special">);</span> 4794 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">length</span><span class="special">()</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span> 4795 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">pop</span><span class="special">()</span> <span class="special">==</span> <span class="number">123</span><span class="special">);</span> 4796 4797 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 4798<span class="special">}</span> 4799</pre> 4800<p> 4801 </p> 4802</div> 4803<div class="section"> 4804<div class="titlepage"><div><div><h3 class="title"> 4805<a name="boost_contract.examples.__cline90___calendar__a_very_simple_calendar"></a><a class="link" href="examples.html#boost_contract.examples.__cline90___calendar__a_very_simple_calendar" title="[Cline90] Calendar: A very simple calendar">[Cline90] 4806 Calendar: A very simple calendar</a> 4807</h3></div></div></div> 4808<p> 4809</p> 4810<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">contract</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 4811<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cassert</span><span class="special">></span> 4812 4813<span class="keyword">class</span> <span class="identifier">calendar</span> <span class="special">{</span> 4814 <span class="keyword">friend</span> <span class="keyword">class</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">access</span><span class="special">;</span> 4815 4816 <span class="keyword">void</span> <span class="identifier">invariant</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 4817 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">month</span><span class="special">()</span> <span class="special">>=</span> <span class="number">1</span><span class="special">);</span> 4818 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">month</span><span class="special">()</span> <span class="special"><=</span> <span class="number">12</span><span class="special">);</span> 4819 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">date</span><span class="special">()</span> <span class="special">>=</span> <span class="number">1</span><span class="special">);</span> 4820 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">date</span><span class="special">()</span> <span class="special"><=</span> <span class="identifier">days_in</span><span class="special">(</span><span class="identifier">month</span><span class="special">()));</span> 4821 <span class="special">}</span> 4822 4823<span class="keyword">public</span><span class="special">:</span> 4824 <span class="identifier">calendar</span><span class="special">()</span> <span class="special">:</span> <span class="identifier">month_</span><span class="special">(</span><span class="number">1</span><span class="special">),</span> <span class="identifier">date_</span><span class="special">(</span><span class="number">31</span><span class="special">)</span> <span class="special">{</span> 4825 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">constructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 4826 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4827 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">month</span><span class="special">()</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span> 4828 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">date</span><span class="special">()</span> <span class="special">==</span> <span class="number">31</span><span class="special">);</span> 4829 <span class="special">})</span> 4830 <span class="special">;</span> 4831 <span class="special">}</span> 4832 4833 <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">calendar</span><span class="special">()</span> <span class="special">{</span> 4834 <span class="comment">// Check invariants.</span> 4835 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">destructor</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4836 <span class="special">}</span> 4837 4838 <span class="keyword">int</span> <span class="identifier">month</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 4839 <span class="comment">// Check invariants.</span> 4840 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4841 <span class="keyword">return</span> <span class="identifier">month_</span><span class="special">;</span> 4842 <span class="special">}</span> 4843 4844 <span class="keyword">int</span> <span class="identifier">date</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> 4845 <span class="comment">// Check invariants.</span> 4846 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">);</span> 4847 <span class="keyword">return</span> <span class="identifier">date_</span><span class="special">;</span> 4848 <span class="special">}</span> 4849 4850 <span class="keyword">void</span> <span class="identifier">reset</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">new_month</span><span class="special">)</span> <span class="special">{</span> 4851 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">public_function</span><span class="special">(</span><span class="keyword">this</span><span class="special">)</span> 4852 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 4853 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">new_month</span> <span class="special">>=</span> <span class="number">1</span><span class="special">);</span> 4854 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">new_month</span> <span class="special"><=</span> <span class="number">12</span><span class="special">);</span> 4855 <span class="special">})</span> 4856 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4857 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">month</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">new_month</span><span class="special">);</span> 4858 <span class="special">})</span> 4859 <span class="special">;</span> 4860 4861 <span class="identifier">month_</span> <span class="special">=</span> <span class="identifier">new_month</span><span class="special">;</span> 4862 <span class="special">}</span> 4863 4864<span class="keyword">private</span><span class="special">:</span> 4865 <span class="keyword">static</span> <span class="keyword">int</span> <span class="identifier">days_in</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">month</span><span class="special">)</span> <span class="special">{</span> 4866 <span class="keyword">int</span> <span class="identifier">result</span><span class="special">;</span> 4867 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">function</span><span class="special">()</span> 4868 <span class="special">.</span><span class="identifier">precondition</span><span class="special">([&]</span> <span class="special">{</span> 4869 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">month</span> <span class="special">>=</span> <span class="number">1</span><span class="special">);</span> 4870 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">month</span> <span class="special"><=</span> <span class="number">12</span><span class="special">);</span> 4871 <span class="special">})</span> 4872 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">([&]</span> <span class="special">{</span> 4873 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special">>=</span> <span class="number">1</span><span class="special">);</span> 4874 <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">result</span> <span class="special"><=</span> <span class="number">31</span><span class="special">);</span> 4875 <span class="special">})</span> 4876 <span class="special">;</span> 4877 4878 <span class="keyword">return</span> <span class="identifier">result</span> <span class="special">=</span> <span class="number">31</span><span class="special">;</span> <span class="comment">// For simplicity, assume all months have 31 days.</span> 4879 <span class="special">}</span> 4880 4881 <span class="keyword">int</span> <span class="identifier">month_</span><span class="special">,</span> <span class="identifier">date_</span><span class="special">;</span> 4882<span class="special">};</span> 4883 4884<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> 4885 <span class="identifier">calendar</span> <span class="identifier">cal</span><span class="special">;</span> 4886 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">cal</span><span class="special">.</span><span class="identifier">date</span><span class="special">()</span> <span class="special">==</span> <span class="number">31</span><span class="special">);</span> 4887 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">cal</span><span class="special">.</span><span class="identifier">month</span><span class="special">()</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span> 4888 4889 <span class="identifier">cal</span><span class="special">.</span><span class="identifier">reset</span><span class="special">(</span><span class="number">8</span><span class="special">);</span> <span class="comment">// Set month </span> 4890 <span class="identifier">assert</span><span class="special">(</span><span class="identifier">cal</span><span class="special">.</span><span class="identifier">month</span><span class="special">()</span> <span class="special">==</span> <span class="number">8</span><span class="special">);</span> 4891 4892 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 4893<span class="special">}</span> 4894</pre> 4895<p> 4896 </p> 4897</div> 4898</div> 4899<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 4900<td align="left"></td> 4901<td align="right"><div class="copyright-footer">Copyright © 2008-2019 Lorenzo Caminiti<p> 4902 Distributed under the Boost Software License, Version 1.0 (see accompanying 4903 file LICENSE_1_0.txt or a copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 4904 </p> 4905</div></td> 4906</tr></table> 4907<hr> 4908<div class="spirit-nav"> 4909<a accesskey="p" href="extras.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../reference.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> 4910</div> 4911</body> 4912</html> 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