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4<title>Time grids for months and weeks</title>
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25<div class="section boost_icl_examples_time_grids" lang="en">
26<div class="titlepage"><div><div><h3 class="title">
27<a name="boost_icl.examples.time_grids"></a><a class="link" href="time_grids.html" title="Time grids for months and weeks"> Time grids for months
28 and weeks</a>
29</h3></div></div></div>
30<p>
31 A <code class="computeroutput"><a class="link" href="../../boost/icl/split_interval_set.html" title="Class template split_interval_set">split_interval_set</a></code>
32 preserves all interval borders on insertion and intersection operations.
33 So given a <code class="computeroutput"><a class="link" href="../../boost/icl/split_interval_set.html" title="Class template split_interval_set">split_interval_set</a></code>
34 and an addition of an interval
35</p>
36<pre class="programlisting"><span class="identifier">x</span> <span class="special">=</span> <span class="special">{[</span><span class="number">1</span><span class="special">,</span> <span class="number">3</span><span class="special">)}</span>
37<span class="identifier">x</span><span class="special">.</span><span class="identifier">add</span><span class="special">(</span> <span class="special">[</span><span class="number">2</span><span class="special">,</span> <span class="number">4</span><span class="special">))</span>
38</pre>
39<p>
40 then the intervals are split at their borders
41</p>
42<pre class="programlisting"><span class="identifier">x</span> <span class="special">==</span> <span class="special">{[</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">)[</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">)[</span><span class="number">3</span><span class="special">,</span><span class="number">4</span><span class="special">)}</span>
43</pre>
44<p>
45 Using this property we can intersect <code class="computeroutput"><a class="link" href="../../boost/icl/split_interval_map.html" title="Class template split_interval_map">split_interval_maps</a></code>
46 in order to iterate over intervals accounting for all occurring changes of
47 interval borders.
48 </p>
49<p>
50 In this example we provide an intersection of two <code class="computeroutput"><a class="link" href="../../boost/icl/split_interval_set.html" title="Class template split_interval_set">split_interval_sets</a></code>
51 representing a month and week time grid.
52 </p>
53<p>
54 </p>
55<p>
56
57</p>
58<pre class="programlisting"><span class="comment">// The next line includes &lt;boost/gregorian/date.hpp&gt;
59</span><span class="comment">// and a few lines of adapter code.
60</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">gregorian</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
61<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>
62<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_set</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
63
64<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">std</span><span class="special">;</span>
65<span class="keyword">using</span> <span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">gregorian</span><span class="special">;</span>
66<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>
67
68<span class="keyword">typedef</span> <span class="identifier">split_interval_set</span><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">gregorian</span><span class="special">::</span><span class="identifier">date</span><span class="special">&gt;</span> <span class="identifier">date_grid</span><span class="special">;</span>
69
70<span class="comment">// This function splits a gregorian::date interval 'scope' into a month grid:
71</span><span class="comment">// For every month contained in 'scope' that month is contained as interval
72</span><span class="comment">// in the resulting split_interval_set.
73</span><span class="identifier">date_grid</span> <span class="identifier">month_grid</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;&amp;</span> <span class="identifier">scope</span><span class="special">)</span>
74<span class="special">{</span>
75 <span class="identifier">split_interval_set</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;</span> <span class="identifier">month_grid</span><span class="special">;</span>
76
77 <span class="identifier">date</span> <span class="identifier">frame_months_1st</span> <span class="special">=</span> <span class="identifier">first</span><span class="special">(</span><span class="identifier">scope</span><span class="special">).</span><span class="identifier">end_of_month</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">days</span><span class="special">(</span><span class="number">1</span><span class="special">)</span> <span class="special">-</span> <span class="identifier">months</span><span class="special">(</span><span class="number">1</span><span class="special">);</span>
78 <span class="identifier">month_iterator</span> <span class="identifier">month_iter</span><span class="special">(</span><span class="identifier">frame_months_1st</span><span class="special">);</span>
79
80 <span class="keyword">for</span><span class="special">(;</span> <span class="identifier">month_iter</span> <span class="special">&lt;=</span> <span class="identifier">last</span><span class="special">(</span><span class="identifier">scope</span><span class="special">);</span> <span class="special">++</span><span class="identifier">month_iter</span><span class="special">)</span>
81 <span class="identifier">month_grid</span> <span class="special">+=</span> <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;::</span><span class="identifier">right_open</span><span class="special">(*</span><span class="identifier">month_iter</span><span class="special">,</span> <span class="special">*</span><span class="identifier">month_iter</span> <span class="special">+</span> <span class="identifier">months</span><span class="special">(</span><span class="number">1</span><span class="special">));</span>
82
83 <span class="identifier">month_grid</span> <span class="special">&amp;=</span> <span class="identifier">scope</span><span class="special">;</span> <span class="comment">// cut off the surplus
84</span>
85 <span class="keyword">return</span> <span class="identifier">month_grid</span><span class="special">;</span>
86<span class="special">}</span>
87
88<span class="comment">// This function splits a gregorian::date interval 'scope' into a week grid:
89</span><span class="comment">// For every week contained in 'scope' that month is contained as interval
90</span><span class="comment">// in the resulting split_interval_set.
91</span><span class="identifier">date_grid</span> <span class="identifier">week_grid</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;&amp;</span> <span class="identifier">scope</span><span class="special">)</span>
92<span class="special">{</span>
93 <span class="identifier">split_interval_set</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;</span> <span class="identifier">week_grid</span><span class="special">;</span>
94
95 <span class="identifier">date</span> <span class="identifier">frame_weeks_1st</span> <span class="special">=</span> <span class="identifier">first</span><span class="special">(</span><span class="identifier">scope</span><span class="special">)</span> <span class="special">+</span> <span class="identifier">days</span><span class="special">(</span><span class="identifier">days_until_weekday</span><span class="special">(</span><span class="identifier">first</span><span class="special">(</span><span class="identifier">scope</span><span class="special">),</span> <span class="identifier">greg_weekday</span><span class="special">(</span><span class="identifier">Monday</span><span class="special">)))</span> <span class="special">-</span> <span class="identifier">weeks</span><span class="special">(</span><span class="number">1</span><span class="special">);</span>
96 <span class="identifier">week_iterator</span> <span class="identifier">week_iter</span><span class="special">(</span><span class="identifier">frame_weeks_1st</span><span class="special">);</span>
97
98 <span class="keyword">for</span><span class="special">(;</span> <span class="identifier">week_iter</span> <span class="special">&lt;=</span> <span class="identifier">last</span><span class="special">(</span><span class="identifier">scope</span><span class="special">);</span> <span class="special">++</span><span class="identifier">week_iter</span><span class="special">)</span>
99 <span class="identifier">week_grid</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;::</span><span class="identifier">right_open</span><span class="special">(*</span><span class="identifier">week_iter</span><span class="special">,</span> <span class="special">*</span><span class="identifier">week_iter</span> <span class="special">+</span> <span class="identifier">weeks</span><span class="special">(</span><span class="number">1</span><span class="special">)));</span>
100
101 <span class="identifier">week_grid</span> <span class="special">&amp;=</span> <span class="identifier">scope</span><span class="special">;</span> <span class="comment">// cut off the surplus
102</span>
103 <span class="keyword">return</span> <span class="identifier">week_grid</span><span class="special">;</span>
104<span class="special">}</span>
105
106<span class="comment">// For a period of two months, starting from today, the function
107</span><span class="comment">// computes a partitioning for months and weeks using intersection
108</span><span class="comment">// operator &amp;= on split_interval_sets.
109</span><span class="keyword">void</span> <span class="identifier">month_and_time_grid</span><span class="special">()</span>
110<span class="special">{</span>
111 <span class="identifier">date</span> <span class="identifier">someday</span> <span class="special">=</span> <span class="identifier">day_clock</span><span class="special">::</span><span class="identifier">local_day</span><span class="special">();</span>
112 <span class="identifier">date</span> <span class="identifier">thenday</span> <span class="special">=</span> <span class="identifier">someday</span> <span class="special">+</span> <span class="identifier">months</span><span class="special">(</span><span class="number">2</span><span class="special">);</span>
113
114 <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;</span> <span class="identifier">itv</span> <span class="special">=</span> <span class="identifier">discrete_interval</span><span class="special">&lt;</span><span class="identifier">date</span><span class="special">&gt;::</span><span class="identifier">right_open</span><span class="special">(</span><span class="identifier">someday</span><span class="special">,</span> <span class="identifier">thenday</span><span class="special">);</span>
115
116 <span class="comment">// Compute a month grid
117</span> <span class="identifier">date_grid</span> <span class="identifier">month_and_week_grid</span> <span class="special">=</span> <span class="identifier">month_grid</span><span class="special">(</span><span class="identifier">itv</span><span class="special">);</span>
118 <span class="comment">// Intersection of the month and week grids:
119</span> <span class="identifier">month_and_week_grid</span> <span class="special">&amp;=</span> <span class="identifier">week_grid</span><span class="special">(</span><span class="identifier">itv</span><span class="special">);</span>
120
121 <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"interval : "</span> <span class="special">&lt;&lt;</span> <span class="identifier">first</span><span class="special">(</span><span class="identifier">itv</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">" - "</span> <span class="special">&lt;&lt;</span> <span class="identifier">last</span><span class="special">(</span><span class="identifier">itv</span><span class="special">)</span>
122 <span class="special">&lt;&lt;</span> <span class="string">" month and week partitions:"</span> <span class="special">&lt;&lt;</span> <span class="identifier">endl</span><span class="special">;</span>
123 <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"---------------------------------------------------------------\n"</span><span class="special">;</span>
124
125 <span class="keyword">for</span><span class="special">(</span><span class="identifier">date_grid</span><span class="special">::</span><span class="identifier">iterator</span> <span class="identifier">it</span> <span class="special">=</span> <span class="identifier">month_and_week_grid</span><span class="special">.</span><span class="identifier">begin</span><span class="special">();</span>
126 <span class="identifier">it</span> <span class="special">!=</span> <span class="identifier">month_and_week_grid</span><span class="special">.</span><span class="identifier">end</span><span class="special">();</span> <span class="identifier">it</span><span class="special">++)</span>
127 <span class="special">{</span>
128 <span class="keyword">if</span><span class="special">(</span><span class="identifier">first</span><span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">day</span><span class="special">()</span> <span class="special">==</span> <span class="number">1</span><span class="special">)</span>
129 <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"new month: "</span><span class="special">;</span>
130 <span class="keyword">else</span> <span class="keyword">if</span><span class="special">(</span><span class="identifier">first</span><span class="special">(*</span><span class="identifier">it</span><span class="special">).</span><span class="identifier">day_of_week</span><span class="special">()==</span><span class="identifier">greg_weekday</span><span class="special">(</span><span class="identifier">Monday</span><span class="special">))</span>
131 <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"new week : "</span> <span class="special">;</span>
132 <span class="keyword">else</span> <span class="keyword">if</span><span class="special">(</span><span class="identifier">it</span> <span class="special">==</span> <span class="identifier">month_and_week_grid</span><span class="special">.</span><span class="identifier">begin</span><span class="special">())</span>
133 <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"first day: "</span> <span class="special">;</span>
134 <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">first</span><span class="special">(*</span><span class="identifier">it</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="string">" - "</span> <span class="special">&lt;&lt;</span> <span class="identifier">last</span><span class="special">(*</span><span class="identifier">it</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">endl</span><span class="special">;</span>
135 <span class="special">}</span>
136<span class="special">}</span>
137
138
139<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
140<span class="special">{</span>
141 <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"&gt;&gt;Interval Container Library: Sample month_and_time_grid.cpp &lt;&lt;\n"</span><span class="special">;</span>
142 <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"---------------------------------------------------------------\n"</span><span class="special">;</span>
143 <span class="identifier">month_and_time_grid</span><span class="special">();</span>
144 <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
145<span class="special">}</span>
146
147<span class="comment">// Program output:
148</span><span class="comment">/*
149&gt;&gt;Interval Container Library: Sample month_and_time_grid.cpp &lt;&lt;
150---------------------------------------------------------------
151interval : 2008-Jun-22 - 2008-Aug-21 month and week partitions:
152---------------------------------------------------------------
153first day: 2008-Jun-22 - 2008-Jun-22
154new week : 2008-Jun-23 - 2008-Jun-29
155new week : 2008-Jun-30 - 2008-Jun-30
156new month: 2008-Jul-01 - 2008-Jul-06
157new week : 2008-Jul-07 - 2008-Jul-13
158new week : 2008-Jul-14 - 2008-Jul-20
159new week : 2008-Jul-21 - 2008-Jul-27
160new week : 2008-Jul-28 - 2008-Jul-31
161new month: 2008-Aug-01 - 2008-Aug-03
162new week : 2008-Aug-04 - 2008-Aug-10
163new week : 2008-Aug-11 - 2008-Aug-17
164new week : 2008-Aug-18 - 2008-Aug-21
165*/</span>
166</pre>
167<p>
168 </p>
169<p>
170 </p>
171</div>
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174<td align="right"><div class="copyright-footer">Copyright &#169; 2007 -2010 Joachim Faulhaber<br>Copyright &#169; 1999 -2006 Cortex Software GmbH<p>
175 Distributed under the Boost Software License, Version 1.0. (See accompanying
176 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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