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| <div class="section boost_icl_examples_custom_interval" lang="en"> |
| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="boost_icl.examples.custom_interval"></a><a class="link" href="custom_interval.html" title="Custom interval">Custom interval</a> |
| </h3></div></div></div> |
| <p> |
| Example <span class="bold"><strong>custom interval</strong></span> demonstrates how |
| to use interval containers with an own interval class type. |
| </p> |
| <p> |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span 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> |
| |
| <span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">std</span><span class="special">;</span> |
| <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> |
| |
| <span class="comment">// Here is a typical class that may model intervals in your application. |
| </span><span class="keyword">class</span> <span class="identifier">MyInterval</span> |
| <span class="special">{</span> |
| <span class="keyword">public</span><span class="special">:</span> |
| <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> |
| <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> |
| <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> |
| <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> |
| <span class="keyword">private</span><span class="special">:</span> |
| <span class="keyword">int</span> <span class="identifier">_first</span><span class="special">,</span> <span class="identifier">_past</span><span class="special">;</span> |
| <span class="special">};</span> |
| |
| <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">icl</span> |
| <span class="special">{</span> |
| <span class="comment">// Class template interval_traits serves as adapter to register and customize your interval class |
| </span><span class="keyword">template</span><span class="special"><></span> |
| <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><span class="special">{</span> <span class="comment">// your class MyInterval |
| </span> <span class="comment">//2. Define associated types |
| </span> <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> <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> <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> <span class="comment">//3. Next we define the essential functions |
| </span> <span class="comment">// of the specialisation |
| </span> <span class="comment">//3.1 Construction of intervals |
| </span> <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> |
| <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> |
| <span class="comment">//3.2 Selection of values |
| </span> <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> |
| <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> |
| <span class="special">};</span> |
| |
| <span class="keyword">template</span><span class="special"><></span> |
| <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><span class="special">{</span> <span class="comment">// Choose between static_open (lo..up) |
| </span> <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> <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><span class="identifier">lo</span><span class="special">..</span><span class="identifier">up</span><span class="special">)</span> |
| <span class="special">};</span> <span class="comment">// and static_closed [lo..up] |
| </span> |
| <span class="special">}}</span> <span class="comment">// namespace boost icl |
| </span> |
| <span class="keyword">void</span> <span class="identifier">custom_interval</span><span class="special">()</span> |
| <span class="special">{</span> |
| <span class="comment">// Now we can use class MyInterval with interval containers: |
| </span> <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> |
| <span class="identifier">MyIntervalSet</span> <span class="identifier">mySet</span><span class="special">;</span> |
| <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> |
| <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> |
| <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> |
| <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> |
| <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> |
| <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> |
| <span class="special">}</span> |
| |
| |
| <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> |
| <span class="special">{</span> |
| <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> |
| <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"-----------------------------------------------------------\n"</span><span class="special">;</span> |
| <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> |
| <span class="identifier">custom_interval</span><span class="special">();</span> |
| <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> |
| <span class="special">}</span> |
| |
| <span class="comment">// Program output: |
| </span><span class="comment">/*----------------------------------------------------------------------------- |
| >>Interval Container Library: Sample custom_interval.cpp << |
| ----------------------------------------------------------- |
| This program uses a user defined interval class: |
| {[1, 9)} |
| {[1, 3) [4, 6) [7, 9)} subtracted 3 and 6 |
| {[1,2) [3,4) [6,7) [8,9)} flipped between 2 and 7 |
| -----------------------------------------------------------------------------*/</span> |
| </pre> |
| <p> |
| </p> |
| <p> |
| </p> |
| </div> |
| <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> |
| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2007 -2010 Joachim Faulhaber<br>Copyright © 1999 -2006 Cortex Software GmbH<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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>) |
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