1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Party's tallest guests</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. Boost.Icl"> 8<link rel="up" href="../examples.html" title="Examples"> 9<link rel="prev" href="partys_height_average.html" title="Party's height average"> 10<link rel="next" href="time_grids.html" title="Time grids for months and weeks"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="partys_height_average.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="time_grids.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 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<pre class="programlisting"><span class="comment">// The next line includes <boost/date_time/posix_time/posix_time.hpp></span> 49<span class="comment">// and a few lines of adapter code.</span> 50<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">ptime</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 51<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span> 52<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_map</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 53<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">split_interval_map</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> 54 55<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">std</span><span class="special">;</span> 56<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> 57<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> 58 59 60<span class="comment">// A party's height shall be defined as the maximum height of all guests ;-)</span> 61<span class="comment">// The last parameter 'inplace_max' is a functor template that calls a max </span> 62<span class="comment">// aggregation on overlap.</span> 63<span class="keyword">typedef</span> <span class="identifier">interval_map</span><span class="special"><</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">></span> 64 <span class="identifier">PartyHeightHistoryT</span><span class="special">;</span> 65 66<span class="comment">// Using a split_interval_map we preserve interval splittings that occurred via insertion.</span> 67<span class="keyword">typedef</span> <span class="identifier">split_interval_map</span><span class="special"><</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">></span> 68 <span class="identifier">PartyHeightSplitHistoryT</span><span class="special">;</span> 69 70<span class="keyword">void</span> <span class="identifier">partys_height</span><span class="special">()</span> 71<span class="special">{</span> 72 <span class="identifier">PartyHeightHistoryT</span> <span class="identifier">tallest_guest</span><span class="special">;</span> 73 74 <span class="identifier">tallest_guest</span> <span class="special">+=</span> 75 <span class="identifier">make_pair</span><span class="special">(</span> 76 <span class="identifier">discrete_interval</span><span class="special"><</span><span class="identifier">ptime</span><span class="special">>::</span><span class="identifier">right_open</span><span class="special">(</span> 77 <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 19:30"</span><span class="special">),</span> 78 <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 23:00"</span><span class="special">)),</span> 79 <span class="number">180</span><span class="special">);</span> <span class="comment">// Mary & Harry: Harry is 1,80 m tall.</span> 80 81 <span class="identifier">tallest_guest</span> <span class="special">+=</span> 82 <span class="identifier">make_pair</span><span class="special">(</span> 83 <span class="identifier">discrete_interval</span><span class="special"><</span><span class="identifier">ptime</span><span class="special">>::</span><span class="identifier">right_open</span><span class="special">(</span> 84 <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 20:10"</span><span class="special">),</span> 85 <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-21 00:00"</span><span class="special">)),</span> 86 <span class="number">170</span><span class="special">);</span> <span class="comment">// Diana & Susan: Diana is 1,70 m tall.</span> 87 88 <span class="identifier">tallest_guest</span> <span class="special">+=</span> 89 <span class="identifier">make_pair</span><span class="special">(</span> 90 <span class="identifier">discrete_interval</span><span class="special"><</span><span class="identifier">ptime</span><span class="special">>::</span><span class="identifier">right_open</span><span class="special">(</span> 91 <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 22:15"</span><span class="special">),</span> 92 <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-21 00:30"</span><span class="special">)),</span> 93 <span class="number">200</span><span class="special">);</span> <span class="comment">// Peters height is 2,00 m</span> 94 95 <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> 96 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"-------------- History of maximum guest height -------------------\n"</span><span class="special">;</span> 97 <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> 98 <span class="special">{</span> 99 <span class="identifier">discrete_interval</span><span class="special"><</span><span class="identifier">ptime</span><span class="special">></span> <span class="identifier">when</span> <span class="special">=</span> <span class="identifier">height_</span><span class="special">-></span><span class="identifier">first</span><span class="special">;</span> 100 <span class="comment">// Of what height are the tallest guests within the time interval 'when' ?</span> 101 <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> 102 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"["</span> <span class="special"><<</span> <span class="identifier">first</span><span class="special">(</span><span class="identifier">when</span><span class="special">)</span> <span class="special"><<</span> <span class="string">" - "</span> <span class="special"><<</span> <span class="identifier">upper</span><span class="special">(</span><span class="identifier">when</span><span class="special">)</span> <span class="special"><<</span> <span class="string">")"</span> 103 <span class="special"><<</span> <span class="string">": "</span> <span class="special"><<</span> <span class="identifier">height</span> <span class="special"><<</span><span class="string">" cm = "</span> <span class="special"><<</span> <span class="identifier">height</span><span class="special">/</span><span class="number">30.48</span> <span class="special"><<</span> <span class="string">" ft"</span> <span class="special"><<</span> <span class="identifier">endl</span><span class="special">;</span> 104 <span class="special">}</span> 105 106<span class="special">}</span> 107 108<span class="comment">// Next we are using a split_interval_map instead of a joining interval_map</span> 109<span class="keyword">void</span> <span class="identifier">partys_split_height</span><span class="special">()</span> 110<span class="special">{</span> 111 <span class="identifier">PartyHeightSplitHistoryT</span> <span class="identifier">tallest_guest</span><span class="special">;</span> 112 113 <span class="comment">// adding an element can be done wrt. simple aggregate functions</span> 114 <span class="comment">// like e.g. min, max etc. in their 'inplace' or op= incarnation</span> 115 <span class="identifier">tallest_guest</span> <span class="special">+=</span> 116 <span class="identifier">make_pair</span><span class="special">(</span> 117 <span class="identifier">discrete_interval</span><span class="special"><</span><span class="identifier">ptime</span><span class="special">>::</span><span class="identifier">right_open</span><span class="special">(</span> 118 <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 19:30"</span><span class="special">),</span> 119 <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 23:00"</span><span class="special">)),</span> 120 <span class="number">180</span><span class="special">);</span> <span class="comment">// Mary & Harry: Harry is 1,80 m tall.</span> 121 122 <span class="identifier">tallest_guest</span> <span class="special">+=</span> 123 <span class="identifier">make_pair</span><span class="special">(</span> 124 <span class="identifier">discrete_interval</span><span class="special"><</span><span class="identifier">ptime</span><span class="special">>::</span><span class="identifier">right_open</span><span class="special">(</span> 125 <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 20:10"</span><span class="special">),</span> 126 <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-21 00:00"</span><span class="special">)),</span> 127 <span class="number">170</span><span class="special">);</span> <span class="comment">// Diana & Susan: Diana is 1,70 m tall.</span> 128 129 <span class="identifier">tallest_guest</span> <span class="special">+=</span> 130 <span class="identifier">make_pair</span><span class="special">(</span> 131 <span class="identifier">discrete_interval</span><span class="special"><</span><span class="identifier">ptime</span><span class="special">>::</span><span class="identifier">right_open</span><span class="special">(</span> 132 <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-20 22:15"</span><span class="special">),</span> 133 <span class="identifier">time_from_string</span><span class="special">(</span><span class="string">"2008-05-21 00:30"</span><span class="special">)),</span> 134 <span class="number">200</span><span class="special">);</span> <span class="comment">// Peters height is 2,00 m</span> 135 136 <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> 137 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"\n"</span><span class="special">;</span> 138 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"-------- Split History of maximum guest height -------------------\n"</span><span class="special">;</span> 139 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"--- Same map as above but split for every interval insertion. ---\n"</span><span class="special">;</span> 140 <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> 141 <span class="special">{</span> 142 <span class="identifier">discrete_interval</span><span class="special"><</span><span class="identifier">ptime</span><span class="special">></span> <span class="identifier">when</span> <span class="special">=</span> <span class="identifier">height_</span><span class="special">-></span><span class="identifier">first</span><span class="special">;</span> 143 <span class="comment">// Of what height are the tallest guests within the time interval 'when' ?</span> 144 <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> 145 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"["</span> <span class="special"><<</span> <span class="identifier">first</span><span class="special">(</span><span class="identifier">when</span><span class="special">)</span> <span class="special"><<</span> <span class="string">" - "</span> <span class="special"><<</span> <span class="identifier">upper</span><span class="special">(</span><span class="identifier">when</span><span class="special">)</span> <span class="special"><<</span> <span class="string">")"</span> 146 <span class="special"><<</span> <span class="string">": "</span> <span class="special"><<</span> <span class="identifier">height</span> <span class="special"><<</span><span class="string">" cm = "</span> <span class="special"><<</span> <span class="identifier">height</span><span class="special">/</span><span class="number">30.48</span> <span class="special"><<</span> <span class="string">" ft"</span> <span class="special"><<</span> <span class="identifier">endl</span><span class="special">;</span> 147 <span class="special">}</span> 148 149<span class="special">}</span> 150 151 152<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> 153<span class="special">{</span> 154 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">">>Interval Container Library: Sample partys_tallest_guests.cpp <<\n"</span><span class="special">;</span> 155 <span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"------------------------------------------------------------------\n"</span><span class="special">;</span> 156 <span class="identifier">partys_height</span><span class="special">();</span> 157 <span class="identifier">partys_split_height</span><span class="special">();</span> 158 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> 159<span class="special">}</span> 160 161<span class="comment">// Program output:</span> 162<span class="comment">/*----------------------------------------------------------------------------- 163>>Interval Container Library: Sample partys_tallest_guests.cpp << 164------------------------------------------------------------------ 165-------------- History of maximum guest height ------------------- 166[2008-May-20 19:30:00 - 2008-May-20 22:15:00): 180 cm = 5.90551 ft 167[2008-May-20 22:15:00 - 2008-May-21 00:30:00): 200 cm = 6.56168 ft 168 169-------- Split History of maximum guest height ------------------- 170--- Same map as above but split for every interval insertion. --- 171[2008-May-20 19:30:00 - 2008-May-20 20:10:00): 180 cm = 5.90551 ft 172[2008-May-20 20:10:00 - 2008-May-20 22:15:00): 180 cm = 5.90551 ft 173[2008-May-20 22:15:00 - 2008-May-20 23:00:00): 200 cm = 6.56168 ft 174[2008-May-20 23:00:00 - 2008-May-21 00:00:00): 200 cm = 6.56168 ft 175[2008-May-21 00:00:00 - 2008-May-21 00:30:00): 200 cm = 6.56168 ft 176-----------------------------------------------------------------------------*/</span> 177</pre> 178<p> 179 </p> 180</div> 181<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 182<td align="left"></td> 183<td align="right"><div class="copyright-footer">Copyright © 2007-2010 Joachim 184 Faulhaber<br>Copyright © 1999-2006 Cortex Software 185 GmbH<p> 186 Distributed under the Boost Software License, Version 1.0. (See accompanying 187 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>) 188 </p> 189</div></td> 190</tr></table> 191<hr> 192<div class="spirit-nav"> 193<a accesskey="p" href="partys_height_average.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="time_grids.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 194</div> 195</body> 196</html> 197
