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7<title>The MPL Reference Manual: is_sequence</title>
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11<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./insert-range.html" class="navigation-link">Prev</a>&nbsp;<a href="./key-type.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./insert-range.html" class="navigation-link">Back</a>&nbsp;<a href="./key-type.html" class="navigation-link">Along</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./intrinsic-metafunctions.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="./sequences.html" class="navigation-link">Sequences</a> / <a href="./intrinsic-metafunctions.html" class="navigation-link">Intrinsic Metafunctions</a> / <a href="./is-sequence.html" class="navigation-link">is_sequence</a></td>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="is-sequence">
15<h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id366" name="is-sequence">is_sequence</a></h1>
16<div class="section" id="is-synopsis">
17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
18<pre class="literal-block">
19template&lt;
20      typename X
21    &gt;
22struct <a href="./is-sequence.html" class="identifier">is_sequence</a>
23{
24    typedef <em>unspecified</em> type;
25};
26</pre>
27</div>
28<div class="section" id="is-description">
29<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
30<p>Returns a boolean <a class="reference" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">c</span></tt> such that <tt class="literal"><span class="pre">c::value</span> <span class="pre">==</span> <span class="pre">true</span></tt> if and
31only if <tt class="literal"><span class="pre">X</span></tt> is a model of <a class="reference" href="./forward-sequence.html">Forward Sequence</a>.</p>
32</div>
33<div class="section" id="is-header">
34<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
35<pre class="literal-block">
36#include &lt;<a href="../../../../boost/mpl/is_sequence.hpp" class="header">boost/mpl/is_sequence.hpp</a>&gt;
37</pre>
38</div>
39<div class="section" id="is-parameters">
40<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
41<table border="1" class="table">
42<colgroup>
43<col width="19%" />
44<col width="23%" />
45<col width="58%" />
46</colgroup>
47<thead valign="bottom">
48<tr><th>Parameter</th>
49<th>Requirement</th>
50<th>Description</th>
51</tr>
52</thead>
53<tbody valign="top">
54<tr><td><tt class="literal"><span class="pre">X</span></tt></td>
55<td>Any type</td>
56<td>The type to query.</td>
57</tr>
58</tbody>
59</table>
60</div>
61<div class="section" id="is-expression-semantics">
62<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
63<pre class="literal-block">
64typedef <a href="./is-sequence.html" class="identifier">is_sequence</a>&lt;X&gt;::type c;
65</pre>
66<table class="field-list" frame="void" rules="none">
67<col class="field-name" />
68<col class="field-body" />
69<tbody valign="top">
70<tr class="field"><th class="field-name">Return type:</th><td class="field-body">Boolean <a class="reference" href="./integral-constant.html">Integral Constant</a>.</td>
71</tr>
72<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
73<pre class="last literal-block">
74typedef <a href="./not.html" class="identifier">not_</a>&lt; is_same&lt; <a href="./begin.html" class="identifier">begin</a>&lt;T&gt;::type,<a href="./void.html" class="identifier">void_</a> &gt; &gt;::type c;
75</pre>
76</td>
77</tr>
78</tbody>
79</table>
80</div>
81<div class="section" id="is-complexity">
82<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
83<p>Amortized constant time.</p>
84</div>
85<div class="section" id="is-example">
86<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
87<pre class="literal-block">
88struct UDT {};
89
90<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./is-sequence.html" class="identifier">is_sequence</a>&lt; std::<a href="./vector.html" class="identifier">vector</a>&lt;int&gt; &gt; ));
91<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./is-sequence.html" class="identifier">is_sequence</a>&lt; int &gt; ));
92<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./is-sequence.html" class="identifier">is_sequence</a>&lt; int&amp; &gt; ));
93<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./is-sequence.html" class="identifier">is_sequence</a>&lt; UDT &gt; ));
94<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( <a href="./is-sequence.html" class="identifier">is_sequence</a>&lt; UDT* &gt; ));
95<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./is-sequence.html" class="identifier">is_sequence</a>&lt; <a href="./range-c.html" class="identifier">range_c</a>&lt;int,0,0&gt; &gt; ));
96<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./is-sequence.html" class="identifier">is_sequence</a>&lt; <a href="./list.html" class="identifier">list</a>&lt;&gt; &gt; ));
97<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./is-sequence.html" class="identifier">is_sequence</a>&lt; <a href="./list.html" class="identifier">list</a>&lt;int&gt; &gt; ));
98<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./is-sequence.html" class="identifier">is_sequence</a>&lt; <a href="./vector.html" class="identifier">vector</a>&lt;&gt; &gt; ));
99<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./is-sequence.html" class="identifier">is_sequence</a>&lt; <a href="./vector.html" class="identifier">vector</a>&lt;int&gt; > ));
100</pre>
101</div>
102<div class="section" id="is-see-also">
103<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
104<p><a class="reference" href="./forward-sequence.html">Forward Sequence</a>, <a class="refentry reference" href="./begin.html"><tt class="refentry literal"><span class="pre">begin</span></tt></a>, <a class="refentry reference" href="./end.html"><tt class="refentry literal"><span class="pre">end</span></tt></a>, <a class="refentry reference" href="./vector.html"><tt class="refentry literal"><span class="pre">vector</span></tt></a>, <a class="refentry reference" href="./list.html"><tt class="refentry literal"><span class="pre">list</span></tt></a>, <a class="refentry reference" href="./range-c.html"><tt class="refentry literal"><span class="pre">range_c</span></tt></a></p>
105<!-- modtime: November 13, 2004 01:29:30 +0000 -->
106<!-- Sequences/Intrinsic Metafunctions//key_type -->
107</div>
108</div>
109
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