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  25 <div class="section boost_icl_examples_partys_tallest_guests" lang="en">
  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_icl.examples.partys_tallest_guests"></a><a class="link" href="partys_tallest_guests.html" title="Party's tallest guests"> Party's tallest
  28       guests</a>
  29 </h3></div></div></div>
  30 <p>
  31         Defining <code class="computeroutput"><span class="keyword">operator</span> <span class="special">+=</span></code>
  32         (and <code class="computeroutput"><span class="special">-=</span></code>) is probably the most
  33         important method to implement arbitrary kinds of user defined aggregations.
  34         An alternative way to choose a desired aggregation is to instantiate an interval_map
  35         class template with an appropriate <span class="emphasis"><em><span class="bold"><strong>aggregation
  36         functor</strong></span></em></span>. For the most common kinds of aggregation the
  37         <span class="bold"><strong>icl</strong></span> provides such functors as shown in the
  38         example.
  39       </p>
  40 <p>
  41         Example <code class="computeroutput"><span class="identifier">partys_tallest_guests</span><span class="special">.</span><span class="identifier">cpp</span></code> also
  42         demonstrates the difference between an <code class="computeroutput"><a class="link" href="../../boost/icl/interval_map.html" title="Class template interval_map">interval_map</a></code>
  43         that joins intervals for equal associated values and a <code class="computeroutput"><a class="link" href="../../boost/icl/split_interval_map.html" title="Class template split_interval_map">split_interval_map</a></code>
  44         that preserves all borders of inserted intervals.
  45       </p>
  46 <p>
  47         </p>
  48 <p>
  49
  50 </p>
  51 <pre class="programlisting"><span class="comment">// The next line includes &lt;boost/date_time/posix_time/posix_time.hpp&gt;
  52 </span><span class="comment">// and a few lines of adapter code.
  53 </span><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">ptime</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  54 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>
  55 <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">interval_map</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
  56 <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>
  57
  58 <span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">std</span><span class="special">;</span>
  59 <span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">;</span>
  60 <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>
  61
  62
  63 <span class="comment">// A party's height shall be defined as the maximum height of all guests ;-)
  64 </span><span class="comment">// The last parameter 'inplace_max' is a functor template that calls a max
  65 </span><span class="comment">// aggregation on overlap.
  66 </span><span class="keyword">typedef</span> <span class="identifier">interval_map</span><span class="special">&lt;</span><span class="identifier">ptime</span><span class="special">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">partial_absorber</span><span class="special">,</span> <span class="identifier">less</span><span class="special">,</span> <span class="identifier">inplace_max</span><span class="special">&gt;</span>
  67     <span class="identifier">PartyHeightHistoryT</span><span class="special">;</span>
  68
  69 <span class="comment">// Using a split_interval_map we preserve interval splittings that occurred via insertion.
  70 </span><span class="keyword">typedef</span> <span class="identifier">split_interval_map</span><span class="special">&lt;</span><span class="identifier">ptime</span><span class="special">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">partial_absorber</span><span class="special">,</span> <span class="identifier">less</span><span class="special">,</span> <span class="identifier">inplace_max</span><span class="special">&gt;</span>
  71     <span class="identifier">PartyHeightSplitHistoryT</span><span class="special">;</span>
  72
  73 <span class="keyword">void</span> <span class="identifier">partys_height</span><span class="special">()</span>
  74 <span class="special">{</span>
  75     <span class="identifier">PartyHeightHistoryT</span> <span class="identifier">tallest_guest</span><span class="special">;</span>
  76
  77     <span class="identifier">tallest_guest</span> <span class="special">+=</span>
  78       <span class="identifier">make_pair</span><span class="special">(</span>
  79         <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">ptime</span><span class="special">&gt;::</span><span class="identifier">right_open</span><span class="special">(</span>
  80           <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 19:30"</span><span class="special">),</span>
  81           <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 23:00"</span><span class="special">)),</span>
  82         <span class="number">180</span><span class="special">);</span> <span class="comment">// Mary &amp; Harry: Harry is 1,80 m tall.
  83 </span>
  84     <span class="identifier">tallest_guest</span> <span class="special">+=</span>
  85       <span class="identifier">make_pair</span><span class="special">(</span>
  86         <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">ptime</span><span class="special">&gt;::</span><span class="identifier">right_open</span><span class="special">(</span>
  87           <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 20:10"</span><span class="special">),</span>
  88           <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-21 00:00"</span><span class="special">)),</span>
  89         <span class="number">170</span><span class="special">);</span> <span class="comment">// Diana &amp; Susan: Diana is 1,70 m tall.
  90 </span>
  91     <span class="identifier">tallest_guest</span> <span class="special">+=</span>
  92       <span class="identifier">make_pair</span><span class="special">(</span>
  93         <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">ptime</span><span class="special">&gt;::</span><span class="identifier">right_open</span><span class="special">(</span>
  94           <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 22:15"</span><span class="special">),</span>
  95           <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-21 00:30"</span><span class="special">)),</span>
  96         <span class="number">200</span><span class="special">);</span> <span class="comment">// Peters height is 2,00 m
  97 </span>
  98     <span class="identifier">PartyHeightHistoryT</span><span class="special">::</span><span class="identifier">iterator</span> <span class="identifier">height_</span> <span class="special">=</span> <span class="identifier">tallest_guest</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span>
  99     <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"-------------- History of maximum guest height -------------------\n"</span><span class="special">;</span>
 100     <span class="keyword">while</span><span class="special">(</span><span class="identifier">height_</span> <span class="special">!=</span> <span class="identifier">tallest_guest</span><span class="special">.</span><span class="identifier">end</span><span class="special">())</span>
 101     <span class="special">{</span>
 102         <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">ptime</span><span class="special">&gt;</span> <span class="identifier">when</span> <span class="special">=</span> <span class="identifier">height_</span><span class="special">-&gt;</span><span class="identifier">first</span><span class="special">;</span>
 103         <span class="comment">// Of what height are the tallest guests within the time interval 'when' ?
 104 </span>        <span class="keyword">int</span> <span class="identifier">height</span> <span class="special">=</span> <span class="special">(*</span><span class="identifier">height_</span><span class="special">++).</span><span class="identifier">second</span><span class="special">;</span>
 105         <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"["</span> <span class="special">&lt;&lt;</span> <span class="identifier">first</span><span class="special">(</span><span class="identifier">when</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">" - "</span> <span class="special">&lt;&lt;</span> <span class="identifier">upper</span><span class="special">(</span><span class="identifier">when</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">")"</span>
 106              <span class="special">&lt;&lt;</span> <span class="string">": "</span> <span class="special">&lt;&lt;</span> <span class="identifier">height</span> <span class="special">&lt;&lt;</span><span class="string">" cm = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">height</span><span class="special">/</span><span class="number">30.48</span> <span class="special">&lt;&lt;</span> <span class="string">" ft"</span> <span class="special">&lt;&lt;</span> <span class="identifier">endl</span><span class="special">;</span>
 107     <span class="special">}</span>
 108
 109 <span class="special">}</span>
 110
 111 <span class="comment">// Next we are using a split_interval_map instead of a joining interval_map
 112 </span><span class="keyword">void</span> <span class="identifier">partys_split_height</span><span class="special">()</span>
 113 <span class="special">{</span>
 114     <span class="identifier">PartyHeightSplitHistoryT</span> <span class="identifier">tallest_guest</span><span class="special">;</span>
 115
 116     <span class="comment">// adding an element can be done wrt. simple aggregate functions
 117 </span>    <span class="comment">// like e.g. min, max etc. in their 'inplace' or op= incarnation
 118 </span>    <span class="identifier">tallest_guest</span> <span class="special">+=</span>
 119       <span class="identifier">make_pair</span><span class="special">(</span>
 120         <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">ptime</span><span class="special">&gt;::</span><span class="identifier">right_open</span><span class="special">(</span>
 121           <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 19:30"</span><span class="special">),</span>
 122           <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 23:00"</span><span class="special">)),</span>
 123         <span class="number">180</span><span class="special">);</span> <span class="comment">// Mary &amp; Harry: Harry is 1,80 m tall.
 124 </span>
 125     <span class="identifier">tallest_guest</span> <span class="special">+=</span>
 126       <span class="identifier">make_pair</span><span class="special">(</span>
 127         <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">ptime</span><span class="special">&gt;::</span><span class="identifier">right_open</span><span class="special">(</span>
 128           <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 20:10"</span><span class="special">),</span>
 129           <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-21 00:00"</span><span class="special">)),</span>
 130         <span class="number">170</span><span class="special">);</span> <span class="comment">// Diana &amp; Susan: Diana is 1,70 m tall.
 131 </span>
 132     <span class="identifier">tallest_guest</span> <span class="special">+=</span>
 133       <span class="identifier">make_pair</span><span class="special">(</span>
 134         <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">ptime</span><span class="special">&gt;::</span><span class="identifier">right_open</span><span class="special">(</span>
 135           <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 22:15"</span><span class="special">),</span>
 136           <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-21 00:30"</span><span class="special">)),</span>
 137         <span class="number">200</span><span class="special">);</span> <span class="comment">// Peters height is 2,00 m
 138 </span>
 139     <span class="identifier">PartyHeightSplitHistoryT</span><span class="special">::</span><span class="identifier">iterator</span> <span class="identifier">height_</span> <span class="special">=</span> <span class="identifier">tallest_guest</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span>
 140     <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"\n"</span><span class="special">;</span>
 141     <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"-------- Split History of maximum guest height -------------------\n"</span><span class="special">;</span>
 142     <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"--- Same map as above but split for every interval insertion.  ---\n"</span><span class="special">;</span>
 143     <span class="keyword">while</span><span class="special">(</span><span class="identifier">height_</span> <span class="special">!=</span> <span class="identifier">tallest_guest</span><span class="special">.</span><span class="identifier">end</span><span class="special">())</span>
 144     <span class="special">{</span>
 145         <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">ptime</span><span class="special">&gt;</span> <span class="identifier">when</span> <span class="special">=</span> <span class="identifier">height_</span><span class="special">-&gt;</span><span class="identifier">first</span><span class="special">;</span>
 146         <span class="comment">// Of what height are the tallest guests within the time interval 'when' ?
 147 </span>        <span class="keyword">int</span> <span class="identifier">height</span> <span class="special">=</span> <span class="special">(*</span><span class="identifier">height_</span><span class="special">++).</span><span class="identifier">second</span><span class="special">;</span>
 148         <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"["</span> <span class="special">&lt;&lt;</span> <span class="identifier">first</span><span class="special">(</span><span class="identifier">when</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">" - "</span> <span class="special">&lt;&lt;</span> <span class="identifier">upper</span><span class="special">(</span><span class="identifier">when</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">")"</span>
 149              <span class="special">&lt;&lt;</span> <span class="string">": "</span> <span class="special">&lt;&lt;</span> <span class="identifier">height</span> <span class="special">&lt;&lt;</span><span class="string">" cm = "</span> <span class="special">&lt;&lt;</span> <span class="identifier">height</span><span class="special">/</span><span class="number">30.48</span> <span class="special">&lt;&lt;</span> <span class="string">" ft"</span> <span class="special">&lt;&lt;</span> <span class="identifier">endl</span><span class="special">;</span>
 150     <span class="special">}</span>
 151
 152 <span class="special">}</span>
 153
 154
 155 <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
 156 <span class="special">{</span>
 157     <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"&gt;&gt;Interval Container Library: Sample partys_tallest_guests.cpp  &lt;&lt;\n"</span><span class="special">;</span>
 158     <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"------------------------------------------------------------------\n"</span><span class="special">;</span>
 159     <span class="identifier">partys_height</span><span class="special">();</span>
 160     <span class="identifier">partys_split_height</span><span class="special">();</span>
 161     <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
 162 <span class="special">}</span>
 163
 164 <span class="comment">// Program output:
 165 </span><span class="comment">/*-----------------------------------------------------------------------------
 166 &gt;&gt;Interval Container Library: Sample partys_tallest_guests.cpp  &lt;&lt;
 167 ------------------------------------------------------------------
 168 -------------- History of maximum guest height -------------------
 169 [2008-May-20 19:30:00 - 2008-May-20 22:15:00): 180 cm = 5.90551 ft
 170 [2008-May-20 22:15:00 - 2008-May-21 00:30:00): 200 cm = 6.56168 ft
 171
 172 -------- Split History of maximum guest height -------------------
 173 --- Same map as above but split for every interval insertion.  ---
 174 [2008-May-20 19:30:00 - 2008-May-20 20:10:00): 180 cm = 5.90551 ft
 175 [2008-May-20 20:10:00 - 2008-May-20 22:15:00): 180 cm = 5.90551 ft
 176 [2008-May-20 22:15:00 - 2008-May-20 23:00:00): 200 cm = 6.56168 ft
 177 [2008-May-20 23:00:00 - 2008-May-21 00:00:00): 200 cm = 6.56168 ft
 178 [2008-May-21 00:00:00 - 2008-May-21 00:30:00): 200 cm = 6.56168 ft
 179 -----------------------------------------------------------------------------*/</span>
 180 </pre>
 181 <p>
 182         </p>
 183 <p>
 184       </p>
 185 </div>
 186 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 187 <td align="left"></td>
 188 <td align="right"><div class="copyright-footer">Copyright &#169; 2007 -2010 Joachim Faulhaber<br>Copyright &#169; 1999 -2006 Cortex Software GmbH<p>
 189         Distributed under the Boost Software License, Version 1.0. (See accompanying
 190         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>)
 191       </p>
 192 </div></td>
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