1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> 4<title>Macro BOOST_CONTRACT_POSTCONDITION</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="reference.html#header.boost.contract_macro_hpp" title="Header <boost/contract_macro.hpp>"> 9<link rel="prev" href="BOOST_CO_idm45394998748208.html" title="Macro BOOST_CONTRACT_PRECONDITION"> 10<link rel="next" href="BOOST_CONTRACT_EXCEPT.html" title="Macro BOOST_CONTRACT_EXCEPT"> 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="BOOST_CO_idm45394998748208.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="reference.html#header.boost.contract_macro_hpp"><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="BOOST_CONTRACT_EXCEPT.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="refentry"> 26<a name="BOOST_CO_idm45394998736528"></a><div class="titlepage"></div> 27<div class="refnamediv"> 28<h2><span class="refentrytitle">Macro BOOST_CONTRACT_POSTCONDITION</span></h2> 29<p>BOOST_CONTRACT_POSTCONDITION — Program postconditions that can be completely disabled at compile-time. </p> 30</div> 31<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 32<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="reference.html#header.boost.contract_macro_hpp" title="Header <boost/contract_macro.hpp>">boost/contract_macro.hpp</a>> 33 34</span>BOOST_CONTRACT_POSTCONDITION(...)</pre></div> 35<div class="refsect1"> 36<a name="idm45707993027728"></a><h2>Description</h2> 37<p><code class="computeroutput">BOOST_CONTRACT_POSTCONDITION(f)</code> expands to code equivalent to the following (note that no code is generated when <code class="computeroutput"><a class="link" href="BOOST_CO_idm45394999656032.html" title="Macro BOOST_CONTRACT_NO_POSTCONDITIONS">BOOST_CONTRACT_NO_POSTCONDITIONS</a></code> is defined):</p> 38<pre class="programlisting"><span class="preprocessor">#ifndef</span> <span class="identifier">BOOST_CONTRACT_NO_POSTCONDITIONS</span> 39 <span class="special">.</span><span class="identifier">postcondition</span><span class="special">(</span><span class="identifier">f</span><span class="special">)</span> 40<span class="preprocessor">#endif</span> 41</pre> 42<p>Where:</p> 43<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p><code class="computeroutput"><span class="bold"><strong>f</strong></span></code> is the functor called by this library to check postconditions <code class="computeroutput">f()</code> or <code class="computeroutput">f(result)</code>. Assertions within this functor are usually programmed using <code class="computeroutput"><a class="link" href="BOOST_CONTRACT_ASSERT.html" title="Macro BOOST_CONTRACT_ASSERT">BOOST_CONTRACT_ASSERT</a></code>, but any exception thrown by a call to this functor indicates a contract assertion failure (and will result in this library calling <code class="computeroutput"><a class="link" href="boost/contract/postcondition_failure.html" title="Function postcondition_failure">boost::contract::postcondition_failure</a></code>). This functor should capture variables by (constant) references (to access the values they will have at function exit). This functor takes the return value (preferably by <code class="computeroutput">const&</code>) <code class="computeroutput">result</code> as its one single parameter <code class="computeroutput">f(result)</code> but only for virtual public functions and public functions overrides, otherwise it takes no parameter <code class="computeroutput">f()</code>. (This is a variadic macro parameter so it can contain commas not protected by round parenthesis.)</p></li></ul></div> 44<p> 45</p> 46<p><span class="bold"><strong>See Also:</strong></span></p> 47<p> <a class="link" href="boost_contract/extras.html#boost_contract.extras.disable_contract_compilation__macro_interface_" title="Disable Contract Compilation (Macro Interface)"> 48 Disable Contract Compilation</a>, <a class="link" href="boost_contract/tutorial.html#boost_contract.tutorial.postconditions" title="Postconditions"> Postconditions</a> </p> 49<p> 50</p> 51<p> 52</p> 53</div> 54</div> 55<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 56<td align="left"></td> 57<td align="right"><div class="copyright-footer">Copyright © 2008-2019 Lorenzo Caminiti<p> 58 Distributed under the Boost Software License, Version 1.0 (see accompanying 59 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>) 60 </p> 61</div></td> 62</tr></table> 63<hr> 64<div class="spirit-nav"> 65<a accesskey="p" href="BOOST_CO_idm45394998748208.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="reference.html#header.boost.contract_macro_hpp"><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="BOOST_CONTRACT_EXCEPT.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 66</div> 67</body> 68</html> 69
