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<link rel="home" href="../../../../index.html" title="Chapter 1. Fusion 2.0">
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<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td>
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<div><div><h5 class="title">
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<a name="fusion.sequence.intrinsic.metafunctions.has_key"></a><a href="has_key.html" title="has_key">has_key</a>
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</h5></div></div>
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<a name="fusion.sequence.intrinsic.metafunctions.has_key.description"></a><h6>
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<a href="has_key.html#fusion.sequence.intrinsic.metafunctions.has_key.description">Description</a>
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<a class="link" href="has_key.html#fusion.sequence.intrinsic.metafunctions.has_key.description">Description</a>
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</h6>
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<p>
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Returns the result type of <a href="../functions/has_key.html" title="has_key"><tt class="computeroutput"><span class="identifier">has_key</span></tt></a>.
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</p>
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<a name="fusion.sequence.intrinsic.metafunctions.has_key.synopsis"></a><h6>
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<a href="has_key.html#fusion.sequence.intrinsic.metafunctions.has_key.synopsis">Synopsis</a>
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<a class="link" href="has_key.html#fusion.sequence.intrinsic.metafunctions.has_key.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">Key</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">has_key</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="id466985"></a><p class="title"><b>Table 1.29. Parameters</b></p>
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<table class="table" summary="Parameters">
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=======
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<a name="id718605"></a><p class="title"><b>Table 1.29. Parameters</b></p>
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<a name="id680977"></a><p class="title"><b>Table 1.33. Parameters</b></p>
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<a name="id673331"></a><p class="title"><b>Table 1.33. Parameters</b></p>
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<a name="id695761"></a><p class="title"><b>Table 1.33. Parameters</b></p>
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<a name="id684491"></a><p class="title"><b>Table 1.33. Parameters</b></p>
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<a name="id681214"></a><p class="title"><b>Table 1.33. 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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</colgroup>
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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">Key</span></tt>
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</p></td>
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<td><p>
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Any type
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</p></td>
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<td><p>
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Key type
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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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<<<<<<< .working
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<a name="fusion.sequence.intrinsic.metafunctions.has_key.expression_semantics"></a><h6>
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<a name="id467122"></a>
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<a href="has_key.html#fusion.sequence.intrinsic.metafunctions.has_key.expression_semantics">Expression
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=======
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<br class="table-break"><a name="fusion.sequence.intrinsic.metafunctions.has_key.expression_semantics"></a><h6>
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<a name="id681325"></a>
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<a class="link" href="has_key.html#fusion.sequence.intrinsic.metafunctions.has_key.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">has_key</span><span class="special"><</span><span class="identifier">Seq</span><span class="special">,</span> <span class="identifier">Key</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>: 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>
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<p>
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<span class="bold"><b>Semantics</b></span>: Returns <tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt>
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if <tt class="computeroutput"><span class="identifier">Seq</span></tt> contains an element
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with key type <tt class="computeroutput"><span class="identifier">Key</span></tt>, returns
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<tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></tt> otherwise.
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</p>
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<a name="fusion.sequence.intrinsic.metafunctions.has_key.header"></a><h6>
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<a name="id681442"></a>
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<a class="link" href="has_key.html#fusion.sequence.intrinsic.metafunctions.has_key.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">has_key</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">has_key</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.has_key.example"></a><h6>
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<a href="has_key.html#fusion.sequence.intrinsic.metafunctions.has_key.example">Example</a>
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<a class="link" href="has_key.html#fusion.sequence.intrinsic.metafunctions.has_key.example">Example</a>
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</h6>
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<pre class="programlisting"><span class="keyword">typedef</span> <a href="../../../container/map.html" title="map"><tt class="computeroutput"><span class="identifier">map</span></tt></a><span class="special"><</span><a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span><span class="special">>,</span> <a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special"><</span><span class="keyword">char</span><span class="special">,</span> <span class="keyword">char</span><span class="special">>,</span> <a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special"><</span><span class="keyword">double</span><span class="special">,</span> <span class="keyword">char</span><span class="special">></span> <span class="special">></span> <span class="identifier">mymap</span><span class="special">;</span>
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<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><a href="has_key.html" title="has_key"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">has_key</span></tt></a><span class="special"><</span><span class="identifier">mymap</span><span class="special">,</span> <span class="keyword">int</span><span class="special">>));</span>
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<span class="identifier">BOOST_MPL_ASSERT_NOT</span><span class="special">((</span><a href="has_key.html" title="has_key"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">has_key</span></tt></a><span class="special"><</span><span class="identifier">mymap</span><span class="special">,</span> <span class="keyword">void</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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