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  25 <div class="section boost_icl_examples_overlap_counter" lang="en">
  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_icl.examples.overlap_counter"></a><a class="link" href="overlap_counter.html" title="Overlap counter">Overlap counter</a>
  28 </h3></div></div></div>
  29 <p>
  30         Example <span class="bold"><strong>overlap counter</strong></span> provides the simplest
  31         application of an interval_map that maps intervals to integers. An interval_map&lt;int,int&gt;
  32         serves as an overlap counter if we only add interval value pairs that carry
  33         1 as associated value.
  34       </p>
  35 <p>
  36         Doing so, the associated values that are accumulated in the interval_map
  37         are just the number of overlaps of all added intervals.
  38       </p>
  39 <p>
  40         </p>
  41 <p>
  42
  43 </p>
  44 <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>
  45 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">icl</span><span class="special">/</span><span class="identifier">split_interval_map</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  46
  47 <span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">std</span><span class="special">;</span>
  48 <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>
  49
  50
  51 <span class="comment">/* The most simple example of an interval_map is an overlap counter.
  52    If intervals are added that are associated with the value 1,
  53    all overlaps of added intervals are counted as a result in the
  54    associated values.
  55 */</span>
  56 <span class="keyword">typedef</span> <span class="identifier">interval_map</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">OverlapCounterT</span><span class="special">;</span>
  57
  58 <span class="keyword">void</span> <span class="identifier">print_overlaps</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">OverlapCounterT</span><span class="special">&amp;</span> <span class="identifier">counter</span><span class="special">)</span>
  59 <span class="special">{</span>
  60     <span class="keyword">for</span><span class="special">(</span><span class="identifier">OverlapCounterT</span><span class="special">::</span><span class="identifier">const_iterator</span> <span class="identifier">it</span> <span class="special">=</span> <span class="identifier">counter</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span> <span class="identifier">it</span> <span class="special">!=</span> <span class="identifier">counter</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span> <span class="identifier">it</span><span class="special">++)</span>
  61     <span class="special">{</span>
  62         <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">itv</span>  <span class="special">=</span> <span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">first</span><span class="special">;</span>
  63         <span class="keyword">int</span> <span class="identifier">overlaps_count</span> <span class="special">=</span> <span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">second</span><span class="special">;</span>
  64         <span class="keyword">if</span><span class="special">(</span><span class="identifier">overlaps_count</span> <span class="special">==</span> <span class="number">1</span><span class="special">)</span>
  65             <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"in interval "</span> <span class="special">&lt;&lt;</span> <span class="identifier">itv</span> <span class="special">&lt;&lt;</span> <span class="string">" intervals do not overlap"</span> <span class="special">&lt;&lt;</span> <span class="identifier">endl</span><span class="special">;</span>
  66         <span class="keyword">else</span>
  67             <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"in interval "</span> <span class="special">&lt;&lt;</span> <span class="identifier">itv</span> <span class="special">&lt;&lt;</span> <span class="string">": "</span><span class="special">&lt;&lt;</span> <span class="identifier">overlaps_count</span> <span class="special">&lt;&lt;</span> <span class="string">" intervals overlap"</span> <span class="special">&lt;&lt;</span> <span class="identifier">endl</span><span class="special">;</span>
  68     <span class="special">}</span>
  69 <span class="special">}</span>
  70
  71 <span class="keyword">void</span> <span class="identifier">overlap_counter</span><span class="special">()</span>
  72 <span class="special">{</span>
  73     <span class="identifier">OverlapCounterT</span> <span class="identifier">overlap_counter</span><span class="special">;</span>
  74     <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">inter_val</span><span class="special">;</span>
  75
  76     <span class="identifier">inter_val</span> <span class="special">=</span> <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;::</span><span class="identifier">right_open</span><span class="special">(</span><span class="number">4</span><span class="special">,</span><span class="number">8</span><span class="special">);</span>
  77     <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"-- adding   "</span> <span class="special">&lt;&lt;</span> <span class="identifier">inter_val</span> <span class="special">&lt;&lt;</span> <span class="string">" -----------------------------------------"</span> <span class="special">&lt;&lt;</span> <span class="identifier">endl</span><span class="special">;</span>
  78     <span class="identifier">overlap_counter</span> <span class="special">+=</span> <span class="identifier">make_pair</span><span class="special">(</span><span class="identifier">inter_val</span><span class="special">,</span> <span class="number">1</span><span class="special">);</span>
  79     <span class="identifier">print_overlaps</span><span class="special">(</span><span class="identifier">overlap_counter</span><span class="special">);</span>
  80     <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"-----------------------------------------------------------"</span> <span class="special">&lt;&lt;</span> <span class="identifier">endl</span><span class="special">;</span>
  81
  82     <span class="identifier">inter_val</span> <span class="special">=</span> <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;::</span><span class="identifier">right_open</span><span class="special">(</span><span class="number">6</span><span class="special">,</span><span class="number">9</span><span class="special">);</span>
  83     <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"-- adding   "</span> <span class="special">&lt;&lt;</span> <span class="identifier">inter_val</span> <span class="special">&lt;&lt;</span> <span class="string">" -----------------------------------------"</span> <span class="special">&lt;&lt;</span> <span class="identifier">endl</span><span class="special">;</span>
  84     <span class="identifier">overlap_counter</span> <span class="special">+=</span> <span class="identifier">make_pair</span><span class="special">(</span><span class="identifier">inter_val</span><span class="special">,</span> <span class="number">1</span><span class="special">);</span>
  85     <span class="identifier">print_overlaps</span><span class="special">(</span><span class="identifier">overlap_counter</span><span class="special">);</span>
  86     <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"-----------------------------------------------------------"</span> <span class="special">&lt;&lt;</span> <span class="identifier">endl</span><span class="special">;</span>
  87
  88     <span class="identifier">inter_val</span> <span class="special">=</span> <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">&gt;::</span><span class="identifier">right_open</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">9</span><span class="special">);</span>
  89     <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"-- adding   "</span> <span class="special">&lt;&lt;</span> <span class="identifier">inter_val</span> <span class="special">&lt;&lt;</span> <span class="string">" -----------------------------------------"</span> <span class="special">&lt;&lt;</span> <span class="identifier">endl</span><span class="special">;</span>
  90     <span class="identifier">overlap_counter</span> <span class="special">+=</span> <span class="identifier">make_pair</span><span class="special">(</span><span class="identifier">inter_val</span><span class="special">,</span> <span class="number">1</span><span class="special">);</span>
  91     <span class="identifier">print_overlaps</span><span class="special">(</span><span class="identifier">overlap_counter</span><span class="special">);</span>
  92     <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"-----------------------------------------------------------"</span> <span class="special">&lt;&lt;</span> <span class="identifier">endl</span><span class="special">;</span>
  93
  94 <span class="special">}</span>
  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">&lt;&lt;</span> <span class="string">"&gt;&gt;Interval Container Library: Sample overlap_counter.cpp &lt;&lt;\n"</span><span class="special">;</span>
  99     <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"-----------------------------------------------------------\n"</span><span class="special">;</span>
 100     <span class="identifier">overlap_counter</span><span class="special">();</span>
 101     <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
 102 <span class="special">}</span>
 103
 104 <span class="comment">// Program output:
 105 </span>
 106 <span class="comment">// &gt;&gt;Interval Container Library: Sample overlap_counter.cpp &lt;&lt;
 107 </span><span class="comment">// -----------------------------------------------------------
 108 </span><span class="comment">// -- adding   [4,8) -----------------------------------------
 109 </span><span class="comment">// in interval [4,8) intervals do not overlap
 110 </span><span class="comment">// -----------------------------------------------------------
 111 </span><span class="comment">// -- adding   [6,9) -----------------------------------------
 112 </span><span class="comment">// in interval [4,6) intervals do not overlap
 113 </span><span class="comment">// in interval [6,8): 2 intervals overlap
 114 </span><span class="comment">// in interval [8,9) intervals do not overlap
 115 </span><span class="comment">// -----------------------------------------------------------
 116 </span><span class="comment">// -- adding   [1,9) -----------------------------------------
 117 </span><span class="comment">// in interval [1,4) intervals do not overlap
 118 </span><span class="comment">// in interval [4,6): 2 intervals overlap
 119 </span><span class="comment">// in interval [6,8): 3 intervals overlap
 120 </span><span class="comment">// in interval [8,9): 2 intervals overlap
 121 </span><span class="comment">// -----------------------------------------------------------
 122 </span></pre>
 123 <p>
 124         </p>
 125 <p>
 126       </p>
 127 </div>
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 130 <td align="right"><div class="copyright-footer">Copyright &#169; 2007 -2010 Joachim Faulhaber<br>Copyright &#169; 1999 -2006 Cortex Software GmbH<p>
 131         Distributed under the Boost Software License, Version 1.0. (See accompanying
 132         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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