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<div class="refentry">
<a name="boost.gregorian.date_duration"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class date_duration</span></h2>
<p>boost::gregorian::date_duration — Durations in days for gregorian system. </p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../date_time/doxy.html#header.boost.date_time.gregorian.greg_duration_hpp" title="Header <boost/date_time/gregorian/greg_duration.hpp>">boost/date_time/gregorian/greg_duration.hpp</a>>
</span>
<span class="keyword">class</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">:</span>
<span class="keyword">public</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">date_time</span><span class="special">::</span><span class="identifier">date_duration</span><span class="special"><</span> <span class="identifier">date_duration_rep</span> <span class="special">></span>
<span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="comment">// types</span>
<span class="keyword">typedef</span> <span class="identifier">base_type</span><span class="special">::</span><span class="identifier">duration_rep</span> <a name="boost.gregorian.date_duration.duration_rep"></a><span class="identifier">duration_rep</span><span class="special">;</span>
<span class="comment">// <a class="link" href="date_duration.html#boost.gregorian.date_durationconstruct-copy-destruct">construct/copy/destruct</a></span>
<span class="keyword">explicit</span> <a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_5-bb"><span class="identifier">date_duration</span></a><span class="special">(</span><span class="identifier">duration_rep</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_6-bb"><span class="identifier">date_duration</span></a><span class="special">(</span><span class="identifier">date_time</span><span class="special">::</span><span class="identifier">special_values</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_7-bb"><span class="identifier">date_duration</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_8-bb"><span class="identifier">date_duration</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">base_type</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_4-bb">public member functions</a></span>
<span class="keyword">bool</span> <a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_4_1-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_4_2-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_4_3-bb"><span class="keyword">operator</span><span class="special"><</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_4_4-bb"><span class="keyword">operator</span><span class="special">></span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_4_5-bb"><span class="keyword">operator</span><span class="special"><=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_4_6-bb"><span class="keyword">operator</span><span class="special">>=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span> <a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_4_7-bb"><span class="keyword">operator</span><span class="special">-=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span> <a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_4_8-bb"><span class="keyword">operator</span><span class="special">+=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_4_9-bb"><span class="keyword">operator</span><span class="special">-</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span> <a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_4_10-bb"><span class="keyword">operator</span><span class="special">/=</span></a><span class="special">(</span><span class="keyword">int</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_9-bb">public static functions</a></span>
<span class="keyword">static</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <a class="link" href="date_duration.html#id-1_3_14_15_4_9_1_1_1_9_1-bb"><span class="identifier">unit</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.14.15.4.9.3.4"></a><h2>Description</h2>
<div class="refsect2">
<a name="id-1.3.14.15.4.9.3.4.2"></a><h3>
<a name="boost.gregorian.date_durationconstruct-copy-destruct"></a><code class="computeroutput">date_duration</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="id-1_3_14_15_4_9_1_1_1_5-bb"></a><span class="identifier">date_duration</span><span class="special">(</span><span class="identifier">duration_rep</span> day_count <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span></pre>Construct from a day count. </li>
<li class="listitem">
<pre class="literallayout"><a name="id-1_3_14_15_4_9_1_1_1_6-bb"></a><span class="identifier">date_duration</span><span class="special">(</span><span class="identifier">date_time</span><span class="special">::</span><span class="identifier">special_values</span> sv<span class="special">)</span><span class="special">;</span></pre>construct from special_values </li>
<li class="listitem">
<pre class="literallayout"><a name="id-1_3_14_15_4_9_1_1_1_7-bb"></a><span class="identifier">date_duration</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span> other<span class="special">)</span><span class="special">;</span></pre>Copy constructor. </li>
<li class="listitem">
<pre class="literallayout"><a name="id-1_3_14_15_4_9_1_1_1_8-bb"></a><span class="identifier">date_duration</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">base_type</span> <span class="special">&</span> other<span class="special">)</span><span class="special">;</span></pre>Construct from another <code class="computeroutput"><a class="link" href="date_duration.html" title="Class date_duration">date_duration</a></code>. </li>
</ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.14.15.4.9.3.4.3"></a><h3>
<a name="id-1_3_14_15_4_9_1_1_1_4-bb"></a><code class="computeroutput">date_duration</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><pre class="literallayout"><span class="keyword">bool</span> <a name="id-1_3_14_15_4_9_1_1_1_4_1-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span> rhs<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">bool</span> <a name="id-1_3_14_15_4_9_1_1_1_4_2-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span> rhs<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">bool</span> <a name="id-1_3_14_15_4_9_1_1_1_4_3-bb"></a><span class="keyword">operator</span><span class="special"><</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span> rhs<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">bool</span> <a name="id-1_3_14_15_4_9_1_1_1_4_4-bb"></a><span class="keyword">operator</span><span class="special">></span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span> rhs<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">bool</span> <a name="id-1_3_14_15_4_9_1_1_1_4_5-bb"></a><span class="keyword">operator</span><span class="special"><=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span> rhs<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem"><pre class="literallayout"><span class="keyword">bool</span> <a name="id-1_3_14_15_4_9_1_1_1_4_6-bb"></a><span class="keyword">operator</span><span class="special">>=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span> rhs<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li>
<li class="listitem">
<pre class="literallayout"><a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span> <a name="id-1_3_14_15_4_9_1_1_1_4_7-bb"></a><span class="keyword">operator</span><span class="special">-=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span> rhs<span class="special">)</span><span class="special">;</span></pre>Subtract another duration – result is signed. </li>
<li class="listitem">
<pre class="literallayout"><a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span> <a name="id-1_3_14_15_4_9_1_1_1_4_8-bb"></a><span class="keyword">operator</span><span class="special">+=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span> rhs<span class="special">)</span><span class="special">;</span></pre>Add a duration – result is signed. </li>
<li class="listitem">
<pre class="literallayout"><a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <a name="id-1_3_14_15_4_9_1_1_1_4_9-bb"></a><span class="keyword">operator</span><span class="special">-</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>unary- Allows for dd = -date_duration(2); -> dd == -2 </li>
<li class="listitem">
<pre class="literallayout"><a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <span class="special">&</span> <a name="id-1_3_14_15_4_9_1_1_1_4_10-bb"></a><span class="keyword">operator</span><span class="special">/=</span><span class="special">(</span><span class="keyword">int</span> divisor<span class="special">)</span><span class="special">;</span></pre>Division operations on a duration with an integer. </li>
</ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.14.15.4.9.3.4.4"></a><h3>
<a name="id-1_3_14_15_4_9_1_1_1_9-bb"></a><code class="computeroutput">date_duration</code> public static functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="keyword">static</span> <a class="link" href="date_duration.html" title="Class date_duration">date_duration</a> <a name="id-1_3_14_15_4_9_1_1_1_9_1-bb"></a><span class="identifier">unit</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Returns the smallest duration – used by to calculate 'end'. </li></ol></div>
</div>
</div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2001-2005 CrystalClear Software, Inc<p>Subject to the Boost Software License, Version 1.0. (See accompanying file
<code class="filename">LICENSE_1_0.txt</code> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</p>
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