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<div><div><h5 class="title">
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<a name="fusion.sequence.intrinsic.metafunctions.value_at"></a><a href="value_at.html" title="value_at">value_at</a>
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<a name="fusion.sequence.intrinsic.metafunctions.value_at.description"></a><h6>
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<a href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.description">Description</a>
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<a class="link" href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.description">Description</a>
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</h6>
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<p>
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Returns the actual type at a given index from the <a href="../../../sequence.html" title="Sequence">Sequence</a>.
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<a name="fusion.sequence.intrinsic.metafunctions.value_at.synopsis"></a><h6>
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<a href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.synopsis">Synopsis</a>
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<a class="link" href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.synopsis">Synopsis</a>
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</h6>
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<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span>
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<span class="keyword">typename</span> <span class="identifier">Seq</span><span class="special">,</span>
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<span class="keyword">typename</span> <span class="identifier">N</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">value_at</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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</pre>
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<a name="id465644"></a><p class="title"><b>Table 1.27. Parameters</b></p>
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<table class="table" summary="Parameters">
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<a name="id717633"></a><p class="title"><b>Table 1.27. Parameters</b></p>
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<a name="id679025"></a><p class="title"><b>Table 1.31. Parameters</b></p>
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<a name="id671379"></a><p class="title"><b>Table 1.31. Parameters</b></p>
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<a name="id692785"></a><p class="title"><b>Table 1.31. Parameters</b></p>
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<a name="id681447"></a><p class="title"><b>Table 1.31. Parameters</b></p>
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<div class="table-contents"><table class="table" summary="Parameters">
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<colgroup>
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<col>
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<col>
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<col>
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<thead><tr>
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<th><p>
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Parameter
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</p></th>
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<th><p>
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Requirement
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</p></th>
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<th><p>
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Description
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</p></th>
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</tr></thead>
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<tbody>
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<tr>
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<td><p>
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<tt class="computeroutput"><span class="identifier">Seq</span></tt>
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</p></td>
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<td><p>
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A model of <a href="../../concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a>
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</p></td>
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<td><p>
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Argument sequence
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</p></td>
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</tr>
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<tr>
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<td><p>
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<tt class="computeroutput"><span class="identifier">N</span></tt>
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</p></td>
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<td><p>
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An <a href="http://www.boost.org/libs/mpl/doc/refmanual/integral-constant.html" target="_top">MPL
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Integral Constant</a>
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</p></td>
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<td><p>
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Index of element
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</p></td>
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</tr>
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</tbody>
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</table>
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</div>
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<a name="fusion.sequence.intrinsic.metafunctions.value_at.expression_semantics"></a><h6>
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<a name="id465789"></a>
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<a href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.expression_semantics">Expression
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=======
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<br class="table-break"><a name="fusion.sequence.intrinsic.metafunctions.value_at.expression_semantics"></a><h6>
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<a name="id678286"></a>
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<a class="link" href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.expression_semantics">Expression
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Semantics</a>
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</h6>
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<pre class="programlisting"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at</span><span class="special"><</span><span class="identifier">Seq</span><span class="special">,</span> <span class="identifier">N</span><span class="special">>::</span><span class="identifier">type</span>
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</pre>
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<p>
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<span class="bold"><b>Return type</b></span>: Any type.
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</p>
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<p>
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<span class="bold"><b>Semantics</b></span>: Returns the actual type at
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the <tt class="computeroutput"><span class="identifier">N</span></tt>th element of <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
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</p>
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<a name="fusion.sequence.intrinsic.metafunctions.value_at.header"></a><h6>
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<a name="id678369"></a>
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<a class="link" href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.header">Header</a>
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</h6>
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<pre class="programlisting"><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">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">value_at</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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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">include</span><span class="special">/</span><span class="identifier">value_at</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.sequence.intrinsic.metafunctions.value_at.example"></a><h6>
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<a href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.example">Example</a>
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</h6>
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<pre class="programlisting"><span class="keyword">typedef</span> <a href="../../../container/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="keyword">float</span><span class="special">,</span><span class="keyword">char</span><span class="special">></span> <span class="identifier">vec</span><span class="special">;</span>
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<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special"><</span><a href="value_at.html" title="value_at"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at</span></tt></a><span class="special"><</span><span class="identifier">vec</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">int_</span><span class="special"><</span><span class="number">1</span><span class="special">></span> <span class="special">>::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">float</span><span class="special">>));</span>
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</pre>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Schwinger<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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</p>
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