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<div class="titlepage"><div><div><h3 class="title">
<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
      and weeks</a>
</h3></div></div></div>
<p>
        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>
        preserves all interval borders on insertion and intersection operations.
        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>
        and an addition of an interval
</p>
<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>
<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>
</pre>
<p>
        then the intervals are split at their borders
</p>
<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>
</pre>
<p>
        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>
        in order to iterate over intervals accounting for all occurring changes of
        interval borders.
      </p>
<p>
        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>
        representing a month and week time grid.
      </p>
<p>
</p>
<pre class="programlisting"><span class="comment">// The next line includes &lt;boost/gregorian/date.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">gregorian</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">split_interval_set</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">gregorian</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="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>

<span class="comment">// This function splits a gregorian::date interval 'scope' into a month grid:</span>
<span class="comment">// For every month contained in 'scope' that month is contained as interval</span>
<span class="comment">// in the resulting split_interval_set.</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>
<span class="special">{</span>
    <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>

    <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>
    <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>

    <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>
        <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>

    <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</span>

    <span class="keyword">return</span> <span class="identifier">month_grid</span><span class="special">;</span>
<span class="special">}</span>

<span class="comment">// This function splits a gregorian::date interval 'scope' into a week grid:</span>
<span class="comment">// For every week contained in 'scope' that month is contained as interval</span>
<span class="comment">// in the resulting split_interval_set.</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>
<span class="special">{</span>
    <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>

    <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>
    <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>

    <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>
        <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>

    <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</span>

    <span class="keyword">return</span> <span class="identifier">week_grid</span><span class="special">;</span>
<span class="special">}</span>

<span class="comment">// For a period of two months, starting from today, the function</span>
<span class="comment">// computes a partitioning for months and weeks using intersection</span>
<span class="comment">// operator &amp;= on split_interval_sets.</span>
<span class="keyword">void</span> <span class="identifier">month_and_time_grid</span><span class="special">()</span>
<span class="special">{</span>
    <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>
    <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>

    <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>

    <span class="comment">// Compute a month grid</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>
    <span class="comment">// Intersection of the month and week grids:</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>

    <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>
         <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>
    <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"---------------------------------------------------------------\n"</span><span class="special">;</span>

    <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>
        <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>
    <span class="special">{</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</span><span class="special">()</span> <span class="special">==</span> <span class="number">1</span><span class="special">)</span>
            <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"new month: "</span><span class="special">;</span>
        <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>
            <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"new week : "</span> <span class="special">;</span>
        <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>
            <span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"first day: "</span> <span class="special">;</span>
        <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>
    <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 month_and_time_grid.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">month_and_time_grid</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 month_and_time_grid.cpp &lt;&lt;
---------------------------------------------------------------
interval : 2008-Jun-22 - 2008-Aug-21 month and week partitions:
---------------------------------------------------------------
first day: 2008-Jun-22 - 2008-Jun-22
new week : 2008-Jun-23 - 2008-Jun-29
new week : 2008-Jun-30 - 2008-Jun-30
new month: 2008-Jul-01 - 2008-Jul-06
new week : 2008-Jul-07 - 2008-Jul-13
new week : 2008-Jul-14 - 2008-Jul-20
new week : 2008-Jul-21 - 2008-Jul-27
new week : 2008-Jul-28 - 2008-Jul-31
new month: 2008-Aug-01 - 2008-Aug-03
new week : 2008-Aug-04 - 2008-Aug-10
new week : 2008-Aug-11 - 2008-Aug-17
new week : 2008-Aug-18 - 2008-Aug-21
*/</span>
</pre>
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        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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