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<div class="section" id="empty-sequence">
<h1><a class="toc-backref" href="./views.html#id1417">empty_sequence</a></h1>
<div class="section" id="id120">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
struct <a href="./empty-sequence.html" class="identifier">empty_sequence</a>
{
    // <em>unspecified</em>
    // <em>...</em>
};
</pre>
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<div class="section" id="id121">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p>Represents a sequence containing no elements.</p>
</div>
<div class="section" id="id122">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/empty_sequence.hpp" class="header">boost/mpl/empty_sequence.hpp</a>&gt;
</pre>
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<div class="section" id="id123">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>The semantics of an expression are defined only
where they differ from, or are not defined in <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</p>
<p>In the following table, <tt class="literal"><span class="pre">s</span></tt> is an instance of <tt class="literal"><span class="pre"><a href="./empty-sequence.html" class="identifier">empty_sequence</a></span></tt>.</p>
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<tr><th class="head">Expression</th>
<th class="head">Semantics</th>
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<tr><td><tt class="literal"><span class="pre"><a href="./empty-sequence.html" class="identifier">empty_sequence</a></span></tt></td>
<td>An empty <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</td>
</tr>
<tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::type</span></tt></td>
<td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span> <span class="pre">==</span> <span class="pre">0</span></tt>; see <a class="reference internal" href="./random-access-sequence.html">Random Access Sequence</a>.</td>
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<div class="section" id="id124">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
typedef <a href="./begin.html" class="identifier">begin</a>&lt;<a href="./empty-sequence.html" class="identifier">empty_sequence</a>&gt;::type first;
typedef <a href="./end.html" class="identifier">end</a>&lt;<a href="./empty-sequence.html" class="identifier">empty_sequence</a>&gt;::type last;

<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt;first,last&gt; ));
<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a>&lt;<a href="./empty-sequence.html" class="identifier">empty_sequence</a>&gt;::value, ==, 0 );

typedef <a href="./transform-view.html" class="identifier">transform_view</a>&lt;
      <a href="./empty-sequence.html" class="identifier">empty_sequence</a>
    , add_pointer&lt;_&gt;
    &gt; empty_view;

<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./size.html" class="identifier">size</a>&lt;<a href="./empty-sequence.html" class="identifier">empty_sequence</a>&gt;::value, ==, 0 );
</pre>
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<div class="section" id="id125">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./views.html">Views</a>, <a class="reference internal" href="./vector.html">vector</a>, <a class="reference internal" href="./list.html">list</a>, <a class="reference internal" href="./single-view.html">single_view</a></p>
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