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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 <boost/date_time/posix_time/posix_time.hpp> | |
52 | </span><span class="comment">// and a few lines of adapter code. | |
53 | </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">ptime</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> | |
54 | <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span> | |
55 | <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> | |
56 | <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> | |
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"><</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> | |
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"><</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> | |
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"><</span><span class="identifier">ptime</span><span class="special">>::</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 & 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"><</span><span class="identifier">ptime</span><span class="special">>::</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 & 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"><</span><span class="identifier">ptime</span><span class="special">>::</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"><<</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"><</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> | |
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"><<</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> | |
106 | <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> | |
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"><</span><span class="identifier">ptime</span><span class="special">>::</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 & 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"><</span><span class="identifier">ptime</span><span class="special">>::</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 & 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"><</span><span class="identifier">ptime</span><span class="special">>::</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"><<</span> <span class="string">"\n"</span><span class="special">;</span> | |
141 | <span class="identifier">cout</span> <span class="special"><<</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"><<</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"><</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> | |
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"><<</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> | |
149 | <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> | |
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"><<</span> <span class="string">">>Interval Container Library: Sample partys_tallest_guests.cpp <<\n"</span><span class="special">;</span> | |
158 | <span class="identifier">cout</span> <span class="special"><<</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 | >>Interval Container Library: Sample partys_tallest_guests.cpp << | |
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 © 2007 -2010 Joachim Faulhaber<br>Copyright © 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> | |
193 | </tr></table> | |
194 | <hr> | |
195 | <div class="spirit-nav"> | |
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