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<h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1429">clear</a></h1>
<div class="section" id="id211">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
template&lt;
      typename Sequence
    &gt;
struct <a href="./clear.html" class="identifier">clear</a>
{
    typedef <em>unspecified</em> type;
};
</pre>
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<div class="section" id="id212">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p>Returns an empty sequence <a class="reference internal" href="./terminology.html#concept-identical">concept-identical</a> to <tt class="literal"><span class="pre">Sequence</span></tt>.</p>
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<div class="section" id="id213">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/clear.hpp" class="header">boost/mpl/clear.hpp</a>&gt;
</pre>
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<div class="section" id="id214">
<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
<p><a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a></p>
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<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">Sequence</span></tt></td>
<td><a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a> or
<a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a></td>
<td>A sequence to get an empty &quot;copy&quot; of.</td>
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<div class="section" id="id216">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>For any <a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a> or <a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a> <tt class="literal"><span class="pre">s</span></tt>:</p>
<pre class="literal-block">
typedef <a href="./clear.html" class="identifier">clear</a>&lt;s&gt;::type t;
</pre>
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<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first"><a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a> or <a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a>.</p>
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<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
<pre class="literal-block">
typedef <a href="./erase.html" class="identifier">erase</a>&lt; s, <a href="./begin.html" class="identifier">begin</a>&lt;s&gt;::type, <a href="./end.html" class="identifier">end</a>&lt;s&gt;::type &gt;::type t;
</pre>
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<tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first last"><tt class="literal"><span class="pre"><a href="./empty.html" class="identifier">empty</a>&lt;s&gt;::value</span> <span class="pre">==</span> <span class="pre">true</span></tt>.</p>
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<div class="section" id="id217">
<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
<p>Amortized constant time.</p>
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<div class="section" id="id218">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
typedef <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,3,5,7,9,11&gt; odds;
typedef <a href="./clear.html" class="identifier">clear</a>&lt;odds&gt;::type nothing;

<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./empty.html" class="identifier">empty</a>&lt;nothing&gt; ));
</pre>
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<div class="section" id="id219">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference internal" href="./extensible-sequence.html">Extensible Sequence</a>, <a class="reference internal" href="./extensible-associative-sequence.html">Extensible Associative Sequence</a>, <a class="reference internal" href="./erase.html">erase</a>, <a class="reference internal" href="./empty.html">empty</a>, <a class="reference internal" href="./begin.html">begin</a>, <a class="reference internal" href="./end.html">end</a></p>
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