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updated boost from 1_33_1 to 1_34_1
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4<!-- Copyright Aleksey Gurtovoy 2006. Distributed under the Boost -->
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10<title>The MPL Reference Manual: contains</title>
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13<body class="docframe refmanual">
14<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./find-if.html" class="navigation-link">Prev</a>&nbsp;<a href="./count.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./find-if.html" class="navigation-link">Back</a>&nbsp;<a href="./count.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="./contains.html" class="navigation-link">contains</a></td>
16</tr></table><div class="header-separator"></div>
17<div class="section" id="contains">
18<h1><a class="toc-backref" href="./querying-algorithms.html#id405" name="contains">contains</a></h1>
19<div class="section" id="contains-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="./contains.html" class="identifier">contains</a>
27{
28    typedef <em>unspecified</em> type;
29};
30</pre>
31</div>
32<div class="section" id="contains-description">
33<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
34<p>Returns a true-valued <a class="reference" href="./integral-constant.html">Integral Constant</a> if one or more elements in <tt class="literal"><span class="pre">Sequence</span></tt> 
35are identical to <tt class="literal"><span class="pre">T</span></tt>.</p>
36</div>
37<div class="section" id="contains-header">
38<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
39<pre class="literal-block">
40#include &lt;<a href="../../../../boost/mpl/contains.hpp" class="header">boost/mpl/contains.hpp</a>&gt;
41</pre>
42</div>
43<div class="section" id="contains-parameters">
44<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
45<table border="1" class="table">
46<colgroup>
47<col width="19%" />
48<col width="35%" />
49<col width="45%" />
50</colgroup>
51<thead valign="bottom">
52<tr><th>Parameter</th>
53<th>Requirement</th>
54<th>Description</th>
55</tr>
56</thead>
57<tbody valign="top">
58<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
59<td><a class="reference" href="./forward-sequence.html">Forward Sequence</a></td>
60<td>A sequence to be examined.</td>
61</tr>
62<tr><td><tt class="literal"><span class="pre">T</span></tt></td>
63<td>Any type</td>
64<td>A type to search for.</td>
65</tr>
66</tbody>
67</table>
68</div>
69<div class="section" id="contains-expression-semantics">
70<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
71<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>
72<pre class="literal-block">
73typedef <a href="./contains.html" class="identifier">contains</a>&lt;s,t&gt;::type r;
74</pre>
75<table class="field-list" frame="void" rules="none">
76<col class="field-name" />
77<col class="field-body" />
78<tbody valign="top">
79<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>
80</tr>
81<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
82<pre class="last literal-block">
83typedef <a href="./not.html" class="identifier">not_</a>&lt; is_same&lt; 
84      <a href="./find.html" class="identifier">find</a>&lt;s,t&gt;::type
85    , <a href="./end.html" class="identifier">end</a>&lt;s&gt;::type
86    &gt; &gt;::type r;
87</pre>
88</td>
89</tr>
90</tbody>
91</table>
92</div>
93<div class="section" id="contains-complexity">
94<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
95<p>Linear. At most <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span></tt> comparisons for identity.</p>
96</div>
97<div class="section" id="contains-example">
98<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
99<pre class="literal-block">
100typedef <a href="./vector.html" class="identifier">vector</a>&lt;char,int,unsigned,long,unsigned long&gt; types;
101<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./contains.html" class="identifier">contains</a>&lt;types,bool&gt; ));
102</pre>
103</div>
104<div class="section" id="contains-see-also">
105<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
106<p><a class="reference" href="./querying-algorithms.html">Querying Algorithms</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="./count.html"><tt class="refentry literal"><span class="pre">count</span></tt></a>, <a class="refentry reference" href="./lower-bound.html"><tt class="refentry literal"><span class="pre">lower_bound</span></tt></a></p>
107<!-- modtime: November 13, 2004 01:52:38 +0000 -->
108<!-- Algorithms/Querying Algorithms//count |40 -->
109</div>
110</div>
111
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