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<div class="section" id="is-sequence">
<h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1438">is_sequence</a></h1>
<div class="section" id="id292">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
template&lt;
      typename X
    &gt;
struct <a href="./is-sequence.html" class="identifier">is_sequence</a>
{
    typedef <em>unspecified</em> type;
};
</pre>
</div>
<div class="section" id="id293">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p>Returns a boolean <a class="reference internal" 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
only if <tt class="literal"><span class="pre">X</span></tt> is a model of <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>.</p>
</div>
<div class="section" id="id294">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/is_sequence.hpp" class="header">boost/mpl/is_sequence.hpp</a>&gt;
</pre>
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<div class="section" id="id295">
<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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<tr><th class="head">Parameter</th>
<th class="head">Requirement</th>
<th class="head">Description</th>
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<tr><td><tt class="literal"><span class="pre">X</span></tt></td>
<td>Any type</td>
<td>The type to query.</td>
</tr>
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<div class="section" id="id296">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<pre class="literal-block">
typedef <a href="./is-sequence.html" class="identifier">is_sequence</a>&lt;X&gt;::type c;
</pre>
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<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">Boolean <a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</p>
</td>
</tr>
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
<pre class="last literal-block">
typedef <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;
</pre>
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<div class="section" id="id297">
<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
<p>Amortized constant time.</p>
</div>
<div class="section" id="id298">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
struct UDT {};

<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; ));
<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; ));
<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; ));
<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; ));
<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; ));
<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; ));
<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; ));
<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; ));
<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; ));
<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; > ));
</pre>
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<div class="section" id="id299">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>, <a class="reference internal" href="./begin.html">begin</a>, <a class="reference internal" href="./end.html">end</a>, <a class="reference internal" href="./vector.html">vector</a>, <a class="reference internal" href="./list.html">list</a>, <a class="reference internal" href="./range-c.html">range_c</a></p>
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