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<div class="section" lang="en">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="fusion.support.is_sequence"></a><a href="is_sequence.html" title="is_sequence">is_sequence</a></h3></div></div></div>
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<a name="fusion.support.is_sequence.description"></a><h4>
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<a name="id451093"></a>
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<a href="is_sequence.html#fusion.support.is_sequence.description">Description</a>
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</h4>
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<p>
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Metafunction that evaluates to <tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt>
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if a certain type <tt class="computeroutput"><span class="identifier">T</span></tt> is a
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conforming Fusion <a href="../sequences.html" title="Sequences">Sequence</a>, <tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></tt>
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otherwise. This may be specialized to accomodate clients which provide Fusion
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conforming sequences.
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</p>
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<a name="fusion.support.is_sequence.synopsis"></a><h4>
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<a name="id451182"></a>
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<a href="is_sequence.html#fusion.support.is_sequence.synopsis">Synopsis</a>
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</h4>
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<pre class="programlisting">
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<span class="keyword">namespace</span> <span class="identifier">traits</span>
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<span class="special">{</span>
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<span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">is_sequence</span>
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<span class="special">{</span>
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<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
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<span class="special">};</span>
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<span class="special">}</span>
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</pre>
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<a name="fusion.support.is_sequence.parameters"></a><h4>
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<a name="id451312"></a>
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<a href="is_sequence.html#fusion.support.is_sequence.parameters">Parameters</a>
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</h4>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>Parameter</th>
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<th>Requirement</th>
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<th>Description</th>
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</tr></thead>
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<tbody><tr>
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<td><tt class="computeroutput"><span class="identifier">T</span></tt></td>
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<td>Any
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type</td>
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<td>The type to query.</td>
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</tr></tbody>
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</table></div>
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<a name="fusion.support.is_sequence.expression_semantics"></a><h4>
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<a name="id451389"></a>
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<a href="is_sequence.html#fusion.support.is_sequence.expression_semantics">Expression
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Semantics</a>
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</h4>
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<pre class="programlisting">
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<span class="keyword">typedef</span> <span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_sequence</span><span class="special"><</span><span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">c</span><span class="special">;</span>
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</pre>
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<p>
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<span class="bold"><b>Return type</b></span>: An MPL Boolean Constant.
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</p>
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<p>
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<span class="bold"><b>Semantics</b></span>: Metafunction that evaluates to
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<tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt> if a certain type <tt class="computeroutput"><span class="identifier">T</span></tt>
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is a conforming Fusion sequence, <tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></tt>
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otherwise.
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</p>
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<a name="fusion.support.is_sequence.header"></a><h4>
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<a name="id451545"></a>
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<a href="is_sequence.html#fusion.support.is_sequence.header">Header</a>
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</h4>
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<pre class="programlisting">
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">support</span><span class="special">/</span><span class="identifier">is_sequence</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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</pre>
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<a name="fusion.support.is_sequence.example"></a><h4>
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<a name="id451638"></a>
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<a href="is_sequence.html#fusion.support.is_sequence.example">Example</a>
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</h4>
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<pre class="programlisting">
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<span class="identifier">BOOST_MPL_ASSERT_NOT</span><span class="special">((</span> <span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_sequence</span><span class="special"><</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="special">></span> <span class="special">));</span>
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<span class="identifier">BOOST_MPL_ASSERT_NOT</span><span class="special">((</span> <span class="identifier">is_sequence</span><span class="special"><</span> <span class="keyword">int</span> <span class="special">></span> <span class="special">));</span>
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<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span> <span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_sequence</span><span class="special"><</span><a href="../sequences/containers/list.html" title="list"><tt class="computeroutput"><span class="identifier">list</span></tt></a><span class="special"><></span> <span class="special">></span> <span class="special">));</span>
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<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span> <span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_sequence</span><span class="special"><</span><a href="../sequences/containers/list.html" title="list"><tt class="computeroutput"><span class="identifier">list</span></tt></a><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="special">></span> <span class="special">));</span>
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<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span> <span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_sequence</span><span class="special"><</span><a href="../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special"><></span> <span class="special">></span> <span class="special">));</span>
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<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span> <span class="identifier">traits</span><span class="special">::</span><span class="identifier">is_sequence</span><span class="special"><</span><a href="../sequences/containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="special">></span> <span class="special">));</span>
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</pre>
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