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<div class="section boost_icl_examples_partys_tallest_guests" lang="en">
<div class="titlepage"><div><div><h3 class="title">
<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
guests</a>
</h3></div></div></div>
<p>
Defining <code class="computeroutput"><span class="keyword">operator</span> <span class="special">+=</span></code>
(and <code class="computeroutput"><span class="special">-=</span></code>) is probably the most
important method to implement arbitrary kinds of user defined aggregations.
An alternative way to choose a desired aggregation is to instantiate an interval_map
class template with an appropriate <span class="emphasis"><em><span class="bold"><strong>aggregation
functor</strong></span></em></span>. For the most common kinds of aggregation the
<span class="bold"><strong>icl</strong></span> provides such functors as shown in the
example.
</p>
<p>
Example <code class="computeroutput"><span class="identifier">partys_tallest_guests</span><span class="special">.</span><span class="identifier">cpp</span></code> also
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>
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>
that preserves all borders of inserted intervals.
</p>
<p>
</p>
<p>
</p>
<pre class="programlisting"><span class="comment">// The next line includes &lt;boost/date_time/posix_time/posix_time.hpp&gt;
</span><span class="comment">// and a few lines of adapter code.
</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>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</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">interval_map</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</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">split_interval_map</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</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">posix_time</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">// A party's height shall be defined as the maximum height of all guests ;-)
</span><span class="comment">// The last parameter 'inplace_max' is a functor template that calls a max
</span><span class="comment">// aggregation on overlap.
</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>
<span class="identifier">PartyHeightHistoryT</span><span class="special">;</span>
<span class="comment">// Using a split_interval_map we preserve interval splittings that occurred via insertion.
</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>
<span class="identifier">PartyHeightSplitHistoryT</span><span class="special">;</span>
<span class="keyword">void</span> <span class="identifier">partys_height</span><span class="special">()</span>
<span class="special">{</span>
<span class="identifier">PartyHeightHistoryT</span> <span class="identifier">tallest_guest</span><span class="special">;</span>
<span class="identifier">tallest_guest</span> <span class="special">+=</span>
<span class="identifier">make_pair</span><span class="special">(</span>
<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>
<span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 19:30"</span><span class="special">),</span>
<span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 23:00"</span><span class="special">)),</span>
<span class="number">180</span><span class="special">);</span> <span class="comment">// Mary &amp; Harry: Harry is 1,80 m tall.
</span>
<span class="identifier">tallest_guest</span> <span class="special">+=</span>
<span class="identifier">make_pair</span><span class="special">(</span>
<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>
<span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 20:10"</span><span class="special">),</span>
<span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-21 00:00"</span><span class="special">)),</span>
<span class="number">170</span><span class="special">);</span> <span class="comment">// Diana &amp; Susan: Diana is 1,70 m tall.
</span>
<span class="identifier">tallest_guest</span> <span class="special">+=</span>
<span class="identifier">make_pair</span><span class="special">(</span>
<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>
<span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 22:15"</span><span class="special">),</span>
<span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-21 00:30"</span><span class="special">)),</span>
<span class="number">200</span><span class="special">);</span> <span class="comment">// Peters height is 2,00 m
</span>
<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>
<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>
<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>
<span class="special">{</span>
<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>
<span class="comment">// Of what height are the tallest guests within the time interval 'when' ?
</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>
<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>
<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>
<span class="special">}</span>
<span class="special">}</span>
<span class="comment">// Next we are using a split_interval_map instead of a joining interval_map
</span><span class="keyword">void</span> <span class="identifier">partys_split_height</span><span class="special">()</span>
<span class="special">{</span>
<span class="identifier">PartyHeightSplitHistoryT</span> <span class="identifier">tallest_guest</span><span class="special">;</span>
<span class="comment">// adding an element can be done wrt. simple aggregate functions
</span> <span class="comment">// like e.g. min, max etc. in their 'inplace' or op= incarnation
</span> <span class="identifier">tallest_guest</span> <span class="special">+=</span>
<span class="identifier">make_pair</span><span class="special">(</span>
<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>
<span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 19:30"</span><span class="special">),</span>
<span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 23:00"</span><span class="special">)),</span>
<span class="number">180</span><span class="special">);</span> <span class="comment">// Mary &amp; Harry: Harry is 1,80 m tall.
</span>
<span class="identifier">tallest_guest</span> <span class="special">+=</span>
<span class="identifier">make_pair</span><span class="special">(</span>
<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>
<span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 20:10"</span><span class="special">),</span>
<span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-21 00:00"</span><span class="special">)),</span>
<span class="number">170</span><span class="special">);</span> <span class="comment">// Diana &amp; Susan: Diana is 1,70 m tall.
</span>
<span class="identifier">tallest_guest</span> <span class="special">+=</span>
<span class="identifier">make_pair</span><span class="special">(</span>
<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>
<span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 22:15"</span><span class="special">),</span>
<span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-21 00:30"</span><span class="special">)),</span>
<span class="number">200</span><span class="special">);</span> <span class="comment">// Peters height is 2,00 m
</span>
<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>
<span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"\n"</span><span class="special">;</span>
<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>
<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>
<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>
<span class="special">{</span>
<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>
<span class="comment">// Of what height are the tallest guests within the time interval 'when' ?
</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>
<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>
<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>
<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">&lt;&lt;</span> <span class="string">"&gt;&gt;Interval Container Library: Sample partys_tallest_guests.cpp &lt;&lt;\n"</span><span class="special">;</span>
<span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"------------------------------------------------------------------\n"</span><span class="special">;</span>
<span class="identifier">partys_height</span><span class="special">();</span>
<span class="identifier">partys_split_height</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">/*-----------------------------------------------------------------------------
&gt;&gt;Interval Container Library: Sample partys_tallest_guests.cpp &lt;&lt;
------------------------------------------------------------------
-------------- History of maximum guest height -------------------
[2008-May-20 19:30:00 - 2008-May-20 22:15:00): 180 cm = 5.90551 ft
[2008-May-20 22:15:00 - 2008-May-21 00:30:00): 200 cm = 6.56168 ft
-------- Split History of maximum guest height -------------------
--- Same map as above but split for every interval insertion. ---
[2008-May-20 19:30:00 - 2008-May-20 20:10:00): 180 cm = 5.90551 ft
[2008-May-20 20:10:00 - 2008-May-20 22:15:00): 180 cm = 5.90551 ft
[2008-May-20 22:15:00 - 2008-May-20 23:00:00): 200 cm = 6.56168 ft
[2008-May-20 23:00:00 - 2008-May-21 00:00:00): 200 cm = 6.56168 ft
[2008-May-21 00:00:00 - 2008-May-21 00:30:00): 200 cm = 6.56168 ft
-----------------------------------------------------------------------------*/</span>
</pre>
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