1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Custom interval</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. 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class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">icl</span><span class="special">/</span><span class="identifier">interval_set</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 37 38<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">std</span><span class="special">;</span> 39<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">icl</span><span class="special">;</span> 40 41<span class="comment">// Here is a typical class that may model intervals in your application.</span> 42<span class="keyword">class</span> <span class="identifier">MyInterval</span> 43<span class="special">{</span> 44<span class="keyword">public</span><span class="special">:</span> 45 <span class="identifier">MyInterval</span><span class="special">():</span> <span class="identifier">_first</span><span class="special">(),</span> <span class="identifier">_past</span><span class="special">(){}</span> 46 <span class="identifier">MyInterval</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">lo</span><span class="special">,</span> <span class="keyword">int</span> <span class="identifier">up</span><span class="special">):</span> <span class="identifier">_first</span><span class="special">(</span><span class="identifier">lo</span><span class="special">),</span> <span class="identifier">_past</span><span class="special">(</span><span class="identifier">up</span><span class="special">){}</span> 47 <span class="keyword">int</span> <span class="identifier">first</span><span class="special">()</span><span class="keyword">const</span><span class="special">{</span> <span class="keyword">return</span> <span class="identifier">_first</span><span class="special">;</span> <span class="special">}</span> 48 <span class="keyword">int</span> <span class="identifier">past</span> <span class="special">()</span><span class="keyword">const</span><span class="special">{</span> <span class="keyword">return</span> <span class="identifier">_past</span><span class="special">;</span> <span class="special">}</span> 49<span class="keyword">private</span><span class="special">:</span> 50 <span class="keyword">int</span> <span class="identifier">_first</span><span class="special">,</span> <span class="identifier">_past</span><span class="special">;</span> 51<span class="special">};</span> 52 53<span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">icl</span> 54<span class="special">{</span> 55<span class="comment">// Class template interval_traits serves as adapter to register and customize your interval class</span> 56<span class="keyword">template</span><span class="special"><></span> 57<span class="keyword">struct</span> <span class="identifier">interval_traits</span><span class="special"><</span> <span class="identifier">MyInterval</span> <span class="special">></span> <span class="comment">//1. Partially specialize interval_traits for </span> 58<span class="special">{</span> <span class="comment">// your class MyInterval</span> 59 <span class="comment">//2. Define associated types</span> 60 <span class="keyword">typedef</span> <span class="identifier">MyInterval</span> <span class="identifier">interval_type</span><span class="special">;</span> <span class="comment">//2.1 MyInterval will be the interval_type</span> 61 <span class="keyword">typedef</span> <span class="keyword">int</span> <span class="identifier">domain_type</span><span class="special">;</span> <span class="comment">//2.2 The elements of the domain are ints </span> 62 <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">domain_compare</span><span class="special">;</span> <span class="comment">//2.3 This is the way our element shall be ordered.</span> 63 <span class="comment">//3. Next we define the essential functions </span> 64 <span class="comment">// of the specialisation</span> 65 <span class="comment">//3.1 Construction of intervals</span> 66 <span class="keyword">static</span> <span class="identifier">interval_type</span> <span class="identifier">construct</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">domain_type</span><span class="special">&</span> <span class="identifier">lo</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">domain_type</span><span class="special">&</span> <span class="identifier">up</span><span class="special">)</span> 67 <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">interval_type</span><span class="special">(</span><span class="identifier">lo</span><span class="special">,</span> <span class="identifier">up</span><span class="special">);</span> <span class="special">}</span> 68 <span class="comment">//3.2 Selection of values </span> 69 <span class="keyword">static</span> <span class="identifier">domain_type</span> <span class="identifier">lower</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">interval_type</span><span class="special">&</span> <span class="identifier">inter_val</span><span class="special">){</span> <span class="keyword">return</span> <span class="identifier">inter_val</span><span class="special">.</span><span class="identifier">first</span><span class="special">();</span> <span class="special">};</span> 70 <span class="keyword">static</span> <span class="identifier">domain_type</span> <span class="identifier">upper</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">interval_type</span><span class="special">&</span> <span class="identifier">inter_val</span><span class="special">){</span> <span class="keyword">return</span> <span class="identifier">inter_val</span><span class="special">.</span><span class="identifier">past</span><span class="special">();</span> <span class="special">};</span> 71<span class="special">};</span> 72 73<span class="keyword">template</span><span class="special"><></span> 74<span class="keyword">struct</span> <span class="identifier">interval_bound_type</span><span class="special"><</span><span class="identifier">MyInterval</span><span class="special">></span> <span class="comment">//4. Finally we define the interval borders.</span> 75<span class="special">{</span> <span class="comment">// Choose between static_open (lo..up)</span> 76 <span class="keyword">typedef</span> <span class="identifier">interval_bound_type</span> <span class="identifier">type</span><span class="special">;</span> <span class="comment">// static_left_open (lo..up]</span> 77 <span class="identifier">BOOST_STATIC_CONSTANT</span><span class="special">(</span><span class="identifier">bound_type</span><span class="special">,</span> <span class="identifier">value</span> <span class="special">=</span> <span class="identifier">interval_bounds</span><span class="special">::</span><span class="identifier">static_right_open</span><span class="special">);</span> 78<span class="special">};</span> <span class="comment">// and static_closed [lo..up] </span> 79 80<span class="special">}}</span> <span class="comment">// namespace boost icl</span> 81 82<span class="keyword">void</span> <span class="identifier">custom_interval</span><span class="special">()</span> 83<span class="special">{</span> 84 <span class="comment">// Now we can use class MyInterval with interval containers:</span> 85 <span class="keyword">typedef</span> <span class="identifier">interval_set</span><span class="special"><</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special">,</span> <span class="identifier">MyInterval</span><span class="special">></span> <span class="identifier">MyIntervalSet</span><span class="special">;</span> 86 <span class="identifier">MyIntervalSet</span> <span class="identifier">mySet</span><span class="special">;</span> 87 <span class="identifier">mySet</span> <span class="special">+=</span> <span class="identifier">MyInterval</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">9</span><span class="special">);</span> 88 <span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">mySet</span> <span class="special"><<</span> <span class="identifier">endl</span><span class="special">;</span> 89 <span class="identifier">mySet</span><span class="special">.</span><span class="identifier">subtract</span><span class="special">(</span><span class="number">3</span><span class="special">)</span> <span class="special">-=</span> <span class="number">6</span><span class="special">;</span> 90 <span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">mySet</span> <span class="special"><<</span> <span class="string">" subtracted 3 and 6\n"</span><span class="special">;</span> 91 <span class="identifier">mySet</span> <span class="special">^=</span> <span class="identifier">MyInterval</span><span class="special">(</span><span class="number">2</span><span class="special">,</span><span class="number">8</span><span class="special">);</span> 92 <span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">mySet</span> <span class="special"><<</span> <span class="string">" flipped between 2 and 7\n"</span><span class="special">;</span> 93<span class="special">}</span> 94 95 96<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> 97<span class="special">{</span> 98 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">">>Interval Container Library: Sample custom_interval.cpp <<\n"</span><span class="special">;</span> 99 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"-----------------------------------------------------------\n"</span><span class="special">;</span> 100 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"This program uses a user defined interval class:\n"</span><span class="special">;</span> 101 <span class="identifier">custom_interval</span><span class="special">();</span> 102 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 103<span class="special">}</span> 104 105<span class="comment">// Program output:</span> 106<span class="comment">/*----------------------------------------------------------------------------- 107>>Interval Container Library: Sample custom_interval.cpp << 108----------------------------------------------------------- 109This program uses a user defined interval class: 110{[1, 9)} 111{[1, 3) [4, 6) [7, 9)} subtracted 3 and 6 112{[1,2) [3,4) [6,7) [8,9)} flipped between 2 and 7 113-----------------------------------------------------------------------------*/</span> 114</pre> 115<p> 116 </p> 117</div> 118<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 119<td align="left"></td> 120<td align="right"><div class="copyright-footer">Copyright © 2007-2010 Joachim 121 Faulhaber<br>Copyright © 1999-2006 Cortex Software 122 GmbH<p> 123 Distributed under the Boost Software License, Version 1.0. (See accompanying 124 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 125 </p> 126</div></td> 127</tr></table> 128<hr> 129<div class="spirit-nav"> 130<a accesskey="p" href="std_transform.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../examples.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="../projects.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 131</div> 132</body> 133</html> 134
