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updated boost from 1_33_1 to 1_34_1
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10<title>The MPL Reference Manual: count</title>
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14<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./contains.html" class="navigation-link">Prev</a>&nbsp;<a href="./count-if.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./contains.html" class="navigation-link">Back</a>&nbsp;<a href="./count-if.html" class="navigation-link">Along</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./querying-algorithms.html" class="navigation-link">Up</a>&nbsp;<a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
15<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./algorithms.html" class="navigation-link">Algorithms</a> / <a href="./querying-algorithms.html" class="navigation-link">Querying Algorithms</a> / <a href="./count.html" class="navigation-link">count</a></td>
16</tr></table><div class="header-separator"></div>
17<div class="section" id="count">
18<h1><a class="toc-backref" href="./querying-algorithms.html#id406" name="count">count</a></h1>
19<div class="section" id="count-synopsis">
20<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
21<pre class="literal-block">
22template&lt;
23      typename Sequence
24    , typename T
25    &gt;
26struct <a href="./count.html" class="identifier">count</a>
27{
28    typedef <em>unspecified</em> type;
29};
30</pre>
31</div>
32<div class="section" id="count-description">
33<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
34<p>Returns the number of elements in a <tt class="literal"><span class="pre">Sequence</span></tt> that are identical to <tt class="literal"><span class="pre">T</span></tt>.</p>
35</div>
36<div class="section" id="count-header">
37<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
38<pre class="literal-block">
39#include &lt;<a href="../../../../boost/mpl/count.hpp" class="header">boost/mpl/count.hpp</a>&gt;
40</pre>
41</div>
42<div class="section" id="count-parameters">
43<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
44<table border="1" class="table">
45<colgroup>
46<col width="19%" />
47<col width="35%" />
48<col width="45%" />
49</colgroup>
50<thead valign="bottom">
51<tr><th>Parameter</th>
52<th>Requirement</th>
53<th>Description</th>
54</tr>
55</thead>
56<tbody valign="top">
57<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
58<td><a class="reference" href="./forward-sequence.html">Forward Sequence</a></td>
59<td>A sequence to be examined.</td>
60</tr>
61<tr><td><tt class="literal"><span class="pre">T</span></tt></td>
62<td>Any type</td>
63<td>A type to search for.</td>
64</tr>
65</tbody>
66</table>
67</div>
68<div class="section" id="count-expression-semantics">
69<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
70<p>For any <a class="reference" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt> and arbitrary type <tt class="literal"><span class="pre">t</span></tt>:</p>
71<pre class="literal-block">
72typedef <a href="./count.html" class="identifier">count</a>&lt;s,t&gt;::type n;
73</pre>
74<table class="field-list" frame="void" rules="none">
75<col class="field-name" />
76<col class="field-body" />
77<tbody valign="top">
78<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference" href="./integral-constant.html">Integral Constant</a>.</td>
79</tr>
80<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
81<pre class="last literal-block">
82typedef <a href="./count-if.html" class="identifier">count_if</a>&lt; s,is_same&lt;_,T&gt; &gt;::type n;
83</pre>
84</td>
85</tr>
86</tbody>
87</table>
88</div>
89<div class="section" id="count-complexity">
90<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
91<p>Linear. Exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span></tt> comparisons for identity.</p>
92</div>
93<div class="section" id="count-example">
94<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
95<pre class="literal-block">
96typedef <a href="./vector.html" class="identifier">vector</a>&lt;int,char,long,short,char,short,double,long&gt; types;
97typedef <a href="./count.html" class="identifier">count</a>&lt;types, short&gt;::type n;
98
99<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( n::value, ==, 2 );
100</pre>
101</div>
102<div class="section" id="count-see-also">
103<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
104<p><a class="reference" href="./querying-algorithms.html">Querying Algorithms</a>, <a class="refentry reference" href="./count-if.html"><tt class="refentry literal"><span class="pre">count_if</span></tt></a>, <a class="refentry reference" href="./find.html"><tt class="refentry literal"><span class="pre">find</span></tt></a>, <a class="refentry reference" href="./find-if.html"><tt class="refentry literal"><span class="pre">find_if</span></tt></a>, <a class="refentry reference" href="./contains.html"><tt class="refentry literal"><span class="pre">contains</span></tt></a>, <a class="refentry reference" href="./lower-bound.html"><tt class="refentry literal"><span class="pre">lower_bound</span></tt></a></p>
105<!-- modtime: November 13, 2004 01:52:16 +0000 -->
106<!-- Algorithms/Querying Algorithms//count_if |50 -->
107</div>
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109
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