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7<title>The MPL Reference Manual: contains</title>
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10<body class="docframe refmanual">
11<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>
12<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>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="contains">
15<h1><a class="toc-backref" href="./querying-algorithms.html#id405" name="contains">contains</a></h1>
16<div class="section" id="contains-synopsis">
17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
18<pre class="literal-block">
19template&lt;
20      typename Sequence
21    , typename T
22    &gt;
23struct <a href="./contains.html" class="identifier">contains</a>
24{
25    typedef <em>unspecified</em> type;
26};
27</pre>
28</div>
29<div class="section" id="contains-description">
30<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
31<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> 
32are identical to <tt class="literal"><span class="pre">T</span></tt>.</p>
33</div>
34<div class="section" id="contains-header">
35<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
36<pre class="literal-block">
37#include &lt;<a href="../../../../boost/mpl/contains.hpp" class="header">boost/mpl/contains.hpp</a>&gt;
38</pre>
39</div>
40<div class="section" id="contains-parameters">
41<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
42<table border="1" class="table">
43<colgroup>
44<col width="19%" />
45<col width="35%" />
46<col width="45%" />
47</colgroup>
48<thead valign="bottom">
49<tr><th>Parameter</th>
50<th>Requirement</th>
51<th>Description</th>
52</tr>
53</thead>
54<tbody valign="top">
55<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
56<td><a class="reference" href="./forward-sequence.html">Forward Sequence</a></td>
57<td>A sequence to be examined.</td>
58</tr>
59<tr><td><tt class="literal"><span class="pre">T</span></tt></td>
60<td>Any type</td>
61<td>A type to search for.</td>
62</tr>
63</tbody>
64</table>
65</div>
66<div class="section" id="contains-expression-semantics">
67<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
68<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>
69<pre class="literal-block">
70typedef <a href="./contains.html" class="identifier">contains</a>&lt;s,t&gt;::type r;
71</pre>
72<table class="field-list" frame="void" rules="none">
73<col class="field-name" />
74<col class="field-body" />
75<tbody valign="top">
76<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>
77</tr>
78<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
79<pre class="last literal-block">
80typedef <a href="./not.html" class="identifier">not_</a>&lt; is_same&lt; 
81      <a href="./find.html" class="identifier">find</a>&lt;s,t&gt;::type
82    , <a href="./end.html" class="identifier">end</a>&lt;s&gt;::type
83    &gt; &gt;::type r;
84</pre>
85</td>
86</tr>
87</tbody>
88</table>
89</div>
90<div class="section" id="contains-complexity">
91<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
92<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>
93</div>
94<div class="section" id="contains-example">
95<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
96<pre class="literal-block">
97typedef <a href="./vector.html" class="identifier">vector</a>&lt;char,int,unsigned,long,unsigned long&gt; types;
98<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./contains.html" class="identifier">contains</a>&lt;types,bool&gt; ));
99</pre>
100</div>
101<div class="section" id="contains-see-also">
102<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
103<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>
104<!-- modtime: November 13, 2004 01:52:38 +0000 -->
105<!-- Algorithms/Querying Algorithms//count |40 -->
106</div>
107</div>
108
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