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26<a name="years_duration"></a><div class="titlepage"></div>
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28<h2><span class="refentrytitle">Class template years_duration</span></h2>
29<p>boost::date_time::years_duration &#8212; additional duration type that represents a logical year </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> years_duration {
34<span class="bold"><strong>public</strong></span>:
35  <span class="emphasis"><em>// <a href="years_duration.html#years_durationconstruct-copy-destruct">construct/copy/destruct</a></em></span>
36  <a href="years_duration.html#id2500832-bb">years_duration</a>(int_rep);
37  <a href="years_duration.html#id2494294-bb">years_duration</a>(special_values);
38
39  <span class="emphasis"><em>// <a href="years_duration.html#id2499807-bb">public member functions</a></em></span>
40  <span class="type">int_rep</span> <a href="years_duration.html#id2499812-bb">number_of_years</a>() <span class="bold"><strong>const</strong></span>;
41  <span class="type">duration_type</span> <a href="years_duration.html#id2469511-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="years_duration.html#id2400535-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="years_duration.html#id2422790-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>;
44  <span class="type"><span class="bold"><strong>bool</strong></span></span> <a href="years_duration.html#id2509907-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>;
45  <span class="type">years_type</span> <a href="years_duration.html#id2433883-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>;
46  <span class="type">years_type &amp;</span> <a href="years_duration.html#id2394158-bb"><span class="bold"><strong>operator</strong></span>+=</a>(<span class="bold"><strong>const</strong></span> years_type &amp;) ;
47  <span class="type">years_type</span> <a href="years_duration.html#id2409965-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>;
48  <span class="type">years_type &amp;</span> <a href="years_duration.html#id2434523-bb"><span class="bold"><strong>operator</strong></span>-=</a>(<span class="bold"><strong>const</strong></span> years_type &amp;) ;
49  <span class="type">years_type</span> <a href="years_duration.html#id2508356-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">years_type &amp;</span> <a href="years_duration.html#id2424513-bb"><span class="bold"><strong>operator</strong></span> *=</a>(<span class="bold"><strong>const</strong></span> int_type) ;
51  <span class="type">years_type</span> <a href="years_duration.html#id2483657-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">years_type &amp;</span> <a href="years_duration.html#id2521577-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="years_duration.html#id2495882-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>;
54  <span class="type">months_type</span> <a href="years_duration.html#id2528104-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>;
55};</pre></div>
56<div class="refsect1" lang="en">
57<a name="id2612830"></a><h2>Description</h2>
58<p>A logical year enables things like: "date(2002,Mar,2) + years(2) -&gt; 2004-Mar-2". If the date is a last day-of-the-month, the result will also be a last-day-of-the-month (ie date(2001-Feb-28) + years(3) -&gt; 2004-Feb-29). </p>
59<div class="refsect2" lang="en">
60<a name="id2612845"></a><h3>
61<a name="years_durationconstruct-copy-destruct"></a><code class="computeroutput">years_duration</code> construct/copy/destruct</h3>
62<div class="orderedlist"><ol type="1">
63<li><pre class="literallayout"><a name="id2500832-bb"></a>years_duration(int_rep num);</pre></li>
64<li><pre class="literallayout"><a name="id2494294-bb"></a>years_duration(special_values sv);</pre></li>
65</ol></div>
66</div>
67<div class="refsect2" lang="en">
68<a name="id2612894"></a><h3>
69<a name="id2499807-bb"></a><code class="computeroutput">years_duration</code> public member functions</h3>
70<div class="orderedlist"><ol type="1">
71<li><pre class="literallayout"><span class="type">int_rep</span> <a name="id2499812-bb"></a>number_of_years() <span class="bold"><strong>const</strong></span>;</pre></li>
72<li><pre class="literallayout"><span class="type">duration_type</span> <a name="id2469511-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>
73<li><pre class="literallayout"><span class="type">duration_type</span> <a name="id2400535-bb"></a>get_offset(<span class="bold"><strong>const</strong></span> date_type &amp; d) <span class="bold"><strong>const</strong></span>;</pre></li>
74<li><pre class="literallayout"><span class="type"><span class="bold"><strong>bool</strong></span></span> <a name="id2422790-bb"></a><span class="bold"><strong>operator</strong></span>==(<span class="bold"><strong>const</strong></span> years_type &amp; rhs) <span class="bold"><strong>const</strong></span>;</pre></li>
75<li><pre class="literallayout"><span class="type"><span class="bold"><strong>bool</strong></span></span> <a name="id2509907-bb"></a><span class="bold"><strong>operator</strong></span>!=(<span class="bold"><strong>const</strong></span> years_type &amp; rhs) <span class="bold"><strong>const</strong></span>;</pre></li>
76<li><pre class="literallayout"><span class="type">years_type</span> <a name="id2433883-bb"></a><span class="bold"><strong>operator</strong></span>+(<span class="bold"><strong>const</strong></span> years_type &amp; rhs) <span class="bold"><strong>const</strong></span>;</pre></li>
77<li><pre class="literallayout"><span class="type">years_type &amp;</span> <a name="id2394158-bb"></a><span class="bold"><strong>operator</strong></span>+=(<span class="bold"><strong>const</strong></span> years_type &amp; rhs) ;</pre></li>
78<li><pre class="literallayout"><span class="type">years_type</span> <a name="id2409965-bb"></a><span class="bold"><strong>operator</strong></span>-(<span class="bold"><strong>const</strong></span> years_type &amp; rhs) <span class="bold"><strong>const</strong></span>;</pre></li>
79<li><pre class="literallayout"><span class="type">years_type &amp;</span> <a name="id2434523-bb"></a><span class="bold"><strong>operator</strong></span>-=(<span class="bold"><strong>const</strong></span> years_type &amp; rhs) ;</pre></li>
80<li><pre class="literallayout"><span class="type">years_type</span> <a name="id2508356-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>
81<li><pre class="literallayout"><span class="type">years_type &amp;</span> <a name="id2424513-bb"></a><span class="bold"><strong>operator</strong></span> *=(<span class="bold"><strong>const</strong></span> int_type rhs) ;</pre></li>
82<li><pre class="literallayout"><span class="type">years_type</span> <a name="id2483657-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">years_type &amp;</span> <a name="id2521577-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="id2495882-bb"></a><span class="bold"><strong>operator</strong></span>+(<span class="bold"><strong>const</strong></span> months_type &amp; m) <span class="bold"><strong>const</strong></span>;</pre></li>
85<li><pre class="literallayout"><span class="type">months_type</span> <a name="id2528104-bb"></a><span class="bold"><strong>operator</strong></span>-(<span class="bold"><strong>const</strong></span> months_type &amp; m) <span class="bold"><strong>const</strong></span>;</pre></li>
86</ol></div>
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