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<div class="section" id="sequence-tag">
<h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1445">sequence_tag</a></h1>
<div class="section" id="id354">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
template&lt;
      typename X
    &gt;
struct <a href="./sequence-tag.html" class="identifier">sequence_tag</a>
{
    typedef <em>unspecified</em> type;
};
</pre>
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<div class="section" id="id355">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p><tt class="literal"><span class="pre"><a href="./sequence-tag.html" class="identifier">sequence_tag</a></span></tt> is a <a class="reference internal" href="./tag-dispatched-metafunction.html#tag-metafunction">tag metafunctions</a> for all <a class="reference internal" href="./tag-dispatched-metafunction.html">tag dispatched</a>
<a class="reference internal" href="./intrinsic-metafunctions.html">intrinsic sequence operations</a>.</p>
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<div class="section" id="id357">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/sequence_tag.hpp" class="header">boost/mpl/sequence_tag.hpp</a>&gt;
</pre>
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<div class="section" id="id358">
<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>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="literal"><span class="pre">X</span></tt></td>
<td>Any type</td>
<td>A type to obtain a sequence tag for.</td>
</tr>
</tbody>
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<div class="section" id="id359">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>For any arbitrary type <tt class="literal"><span class="pre">x</span></tt>:</p>
<pre class="literal-block">
typedef <a href="./sequence-tag.html" class="identifier">sequence_tag</a>&lt;x&gt;::type tag;
</pre>
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<tr class="field"><th class="field-name">Return type:</th><td class="field-body">A type.</td>
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<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><tt class="literal"><span class="pre">tag</span></tt> is an unspecified tag type for <tt class="literal"><span class="pre">x</span></tt>.</td>
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<div class="section" id="id360">
<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
<p>Amortized constant time.</p>
</div>
<div class="section" id="id361">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference internal" href="./intrinsic-metafunctions.html">Intrinsic Metafunctions</a>, <a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a></p>
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