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26<a name="months_duration"></a><div class="titlepage"></div>
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28<h2><span class="refentrytitle">Class template months_duration</span></h2>
29<p>boost::date_time::months_duration &#8212; additional duration type that represents a logical month </p>
30</div>
31<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
32<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="bold"><strong>template</strong></span>&lt;<span class="bold"><strong>typename</strong></span> base_config&gt; 
33<span class="bold"><strong>class</strong></span> months_duration {
34<span class="bold"><strong>public</strong></span>:
35  <span class="emphasis"><em>// <a href="months_duration.html#months_durationconstruct-copy-destruct">construct/copy/destruct</a></em></span>
36  <a href="months_duration.html#id2396284-bb">months_duration</a>(int_rep);
37  <a href="months_duration.html#id2440140-bb">months_duration</a>(special_values);
38
39  <span class="emphasis"><em>// <a href="months_duration.html#id2527587-bb">public member functions</a></em></span>
40  <span class="type">int_rep</span> <a href="months_duration.html#id2527590-bb">number_of_months</a>() <span class="bold"><strong>const</strong></span>;
41  <span class="type">duration_type</span> <a href="months_duration.html#id2520797-bb">get_neg_offset</a>(<span class="bold"><strong>const</strong></span> date_type &amp;) <span class="bold"><strong>const</strong></span>;
42  <span class="type">duration_type</span> <a href="months_duration.html#id2510313-bb">get_offset</a>(<span class="bold"><strong>const</strong></span> date_type &amp;) <span class="bold"><strong>const</strong></span>;
43  <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="months_duration.html#id2393099-bb"><span class="bold"><strong>operator</strong></span>==</a>(<span class="bold"><strong>const</strong></span> months_type &amp;) <span class="bold"><strong>const</strong></span>;
44  <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="months_duration.html#id2384126-bb"><span class="bold"><strong>operator</strong></span>!=</a>(<span class="bold"><strong>const</strong></span> months_type &amp;) <span class="bold"><strong>const</strong></span>;
45  <span class="type">months_type</span> <a href="months_duration.html#id2519169-bb"><span class="bold"><strong>operator</strong></span>+</a>(<span class="bold"><strong>const</strong></span> months_type &amp;) <span class="bold"><strong>const</strong></span>;
46  <span class="type">months_type &amp;</span> <a href="months_duration.html#id2495468-bb"><span class="bold"><strong>operator</strong></span>+=</a>(<span class="bold"><strong>const</strong></span> months_type &amp;) ;
47  <span class="type">months_type</span> <a href="months_duration.html#id2527886-bb"><span class="bold"><strong>operator</strong></span>-</a>(<span class="bold"><strong>const</strong></span> months_type &amp;) <span class="bold"><strong>const</strong></span>;
48  <span class="type">months_type &amp;</span> <a href="months_duration.html#id2412028-bb"><span class="bold"><strong>operator</strong></span>-=</a>(<span class="bold"><strong>const</strong></span> months_type &amp;) ;
49  <span class="type">months_type</span> <a href="months_duration.html#id2384936-bb"><span class="bold"><strong>operator</strong></span> *</a>(<span class="bold"><strong>const</strong></span> int_type) <span class="bold"><strong>const</strong></span>;
50  <span class="type">months_type &amp;</span> <a href="months_duration.html#id2446048-bb"><span class="bold"><strong>operator</strong></span> *=</a>(<span class="bold"><strong>const</strong></span> int_type) ;
51  <span class="type">months_type</span> <a href="months_duration.html#id2493050-bb"><span class="bold"><strong>operator</strong></span>/</a>(<span class="bold"><strong>const</strong></span> int_type) <span class="bold"><strong>const</strong></span>;
52  <span class="type">months_type &amp;</span> <a href="months_duration.html#id2439300-bb"><span class="bold"><strong>operator</strong></span>/=</a>(<span class="bold"><strong>const</strong></span> int_type) ;
53  <span class="type">months_type</span> <a href="months_duration.html#id2470026-bb"><span class="bold"><strong>operator</strong></span>+</a>(<span class="bold"><strong>const</strong></span> years_type &amp;) <span class="bold"><strong>const</strong></span>;
54  <span class="type">months_type &amp;</span> <a href="months_duration.html#id2496333-bb"><span class="bold"><strong>operator</strong></span>+=</a>(<span class="bold"><strong>const</strong></span> years_type &amp;) ;
55  <span class="type">months_type</span> <a href="months_duration.html#id2372990-bb"><span class="bold"><strong>operator</strong></span>-</a>(<span class="bold"><strong>const</strong></span> years_type &amp;) <span class="bold"><strong>const</strong></span>;
56  <span class="type">months_type &amp;</span> <a href="months_duration.html#id2525425-bb"><span class="bold"><strong>operator</strong></span>-=</a>(<span class="bold"><strong>const</strong></span> years_type &amp;) ;
57};</pre></div>
58<div class="refsect1" lang="en">
59<a name="id2611736"></a><h2>Description</h2>
60<p>A logical month enables things like: "date(2002,Mar,2) + months(2) -&gt; 2002-May2". If the date is a last day-of-the-month, the result will also be a last-day-of-the-month. </p>
61<div class="refsect2" lang="en">
62<a name="id2611750"></a><h3>
63<a name="months_durationconstruct-copy-destruct"></a><code class="computeroutput">months_duration</code> construct/copy/destruct</h3>
64<div class="orderedlist"><ol type="1">
65<li><pre class="literallayout"><a name="id2396284-bb"></a>months_duration(int_rep num);</pre></li>
66<li><pre class="literallayout"><a name="id2440140-bb"></a>months_duration(special_values sv);</pre></li>
67</ol></div>
68</div>
69<div class="refsect2" lang="en">
70<a name="id2611798"></a><h3>
71<a name="id2527587-bb"></a><code class="computeroutput">months_duration</code> public member functions</h3>
72<div class="orderedlist"><ol type="1">
73<li><pre class="literallayout"><span class="type">int_rep</span> <a name="id2527590-bb"></a>number_of_months() <span class="bold"><strong>const</strong></span>;</pre></li>
74<li><pre class="literallayout"><span class="type">duration_type</span> <a name="id2520797-bb"></a>get_neg_offset(<span class="bold"><strong>const</strong></span> date_type &amp; d) <span class="bold"><strong>const</strong></span>;</pre></li>
75<li><pre class="literallayout"><span class="type">duration_type</span> <a name="id2510313-bb"></a>get_offset(<span class="bold"><strong>const</strong></span> date_type &amp; d) <span class="bold"><strong>const</strong></span>;</pre></li>
76<li><pre class="literallayout"><span class="type"><span class="bold"><strong>bool</strong></span></span> <a name="id2393099-bb"></a><span class="bold"><strong>operator</strong></span>==(<span class="bold"><strong>const</strong></span> months_type &amp; rhs) <span class="bold"><strong>const</strong></span>;</pre></li>
77<li><pre class="literallayout"><span class="type"><span class="bold"><strong>bool</strong></span></span> <a name="id2384126-bb"></a><span class="bold"><strong>operator</strong></span>!=(<span class="bold"><strong>const</strong></span> months_type &amp; rhs) <span class="bold"><strong>const</strong></span>;</pre></li>
78<li><pre class="literallayout"><span class="type">months_type</span> <a name="id2519169-bb"></a><span class="bold"><strong>operator</strong></span>+(<span class="bold"><strong>const</strong></span> months_type &amp; rhs) <span class="bold"><strong>const</strong></span>;</pre></li>
79<li><pre class="literallayout"><span class="type">months_type &amp;</span> <a name="id2495468-bb"></a><span class="bold"><strong>operator</strong></span>+=(<span class="bold"><strong>const</strong></span> months_type &amp; rhs) ;</pre></li>
80<li><pre class="literallayout"><span class="type">months_type</span> <a name="id2527886-bb"></a><span class="bold"><strong>operator</strong></span>-(<span class="bold"><strong>const</strong></span> months_type &amp; rhs) <span class="bold"><strong>const</strong></span>;</pre></li>
81<li><pre class="literallayout"><span class="type">months_type &amp;</span> <a name="id2412028-bb"></a><span class="bold"><strong>operator</strong></span>-=(<span class="bold"><strong>const</strong></span> months_type &amp; rhs) ;</pre></li>
82<li><pre class="literallayout"><span class="type">months_type</span> <a name="id2384936-bb"></a><span class="bold"><strong>operator</strong></span> *(<span class="bold"><strong>const</strong></span> int_type rhs) <span class="bold"><strong>const</strong></span>;</pre></li>
83<li><pre class="literallayout"><span class="type">months_type &amp;</span> <a name="id2446048-bb"></a><span class="bold"><strong>operator</strong></span> *=(<span class="bold"><strong>const</strong></span> int_type rhs) ;</pre></li>
84<li><pre class="literallayout"><span class="type">months_type</span> <a name="id2493050-bb"></a><span class="bold"><strong>operator</strong></span>/(<span class="bold"><strong>const</strong></span> int_type rhs) <span class="bold"><strong>const</strong></span>;</pre></li>
85<li><pre class="literallayout"><span class="type">months_type &amp;</span> <a name="id2439300-bb"></a><span class="bold"><strong>operator</strong></span>/=(<span class="bold"><strong>const</strong></span> int_type rhs) ;</pre></li>
86<li><pre class="literallayout"><span class="type">months_type</span> <a name="id2470026-bb"></a><span class="bold"><strong>operator</strong></span>+(<span class="bold"><strong>const</strong></span> years_type &amp; y) <span class="bold"><strong>const</strong></span>;</pre></li>
87<li><pre class="literallayout"><span class="type">months_type &amp;</span> <a name="id2496333-bb"></a><span class="bold"><strong>operator</strong></span>+=(<span class="bold"><strong>const</strong></span> years_type &amp; y) ;</pre></li>
88<li><pre class="literallayout"><span class="type">months_type</span> <a name="id2372990-bb"></a><span class="bold"><strong>operator</strong></span>-(<span class="bold"><strong>const</strong></span> years_type &amp; y) <span class="bold"><strong>const</strong></span>;</pre></li>
89<li><pre class="literallayout"><span class="type">months_type &amp;</span> <a name="id2525425-bb"></a><span class="bold"><strong>operator</strong></span>-=(<span class="bold"><strong>const</strong></span> years_type &amp; y) ;</pre></li>
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