forked from boostorg/fusion
updates functional module: only two unfused variants, now
[SVN r51381]
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>has_key</title>
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<link rel="stylesheet" href="../../../../../../../../doc/html/boostbook.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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<meta name="generator" content="DocBook XSL Stylesheets V1.68.1">
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<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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<link rel="up" href="../metafunctions.html" title="Metafunctions">
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<link rel="prev" href="value_at_c.html" title="value_at_c">
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@ -26,18 +26,17 @@
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<div class="titlepage"><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></h5></div></div></div>
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<a name="fusion.sequence.intrinsic.metafunctions.has_key.description"></a><h6>
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<a name="id515522"></a>
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<a name="id1039990"></a>
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<a 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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Returns the result type of <a href="../functions/has_key.html" title="has_key"><code class="computeroutput"><span class="identifier">has_key</span></code></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 name="id515572"></a>
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<a name="id1040034"></a>
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<a 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">
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<span class="keyword">template</span><span class="special"><</span>
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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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@ -46,7 +45,7 @@
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<span class="special">};</span>
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</pre>
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<div class="table">
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<a name="id515690"></a><p class="title"><b>Table<EFBFBD>1.29.<2E>Parameters</b></p>
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<a name="id1040137"></a><p class="title"><b>Table<EFBFBD>1.29.<2E>Parameters</b></p>
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<table class="table" summary="Parameters">
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<colgroup>
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<col>
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@ -74,7 +73,7 @@
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<tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">Seq</span></tt>
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<code class="computeroutput"><span class="identifier">Seq</span></code>
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</p>
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</td>
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<td>
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@ -93,7 +92,7 @@
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<tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">Key</span></tt>
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<code class="computeroutput"><span class="identifier">Key</span></code>
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</p>
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</td>
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<td>
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@ -111,34 +110,32 @@
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</table>
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</div>
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<a name="fusion.sequence.intrinsic.metafunctions.has_key.expression_semantics"></a><h6>
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<a name="id515828"></a>
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<a name="id1040261"></a>
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<a 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">
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<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 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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<span class="bold"><strong>Return type</strong></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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<span class="bold"><strong>Semantics</strong></span>: Returns <code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></code>
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if <code class="computeroutput"><span class="identifier">Seq</span></code> contains an element
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with key type <code class="computeroutput"><span class="identifier">Key</span></code>, returns
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<code class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></code> otherwise.
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</p>
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<p>
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/sequence/intrinsic/has_key.hpp>
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</p>
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<a name="fusion.sequence.intrinsic.metafunctions.has_key.example"></a><h6>
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<a name="id516011"></a>
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<a name="id1040422"></a>
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<a 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">
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<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 class="programlisting"><span class="keyword">typedef</span> <a href="../../../container/map.html" title="map"><code class="computeroutput"><span class="identifier">map</span></code></a><span class="special"><</span><a href="../../../support/pair.html" title="pair"><code class="computeroutput"><span class="identifier">pair</span></code></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"><code class="computeroutput"><span class="identifier">pair</span></code></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"><code class="computeroutput"><span class="identifier">pair</span></code></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"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">has_key</span></code></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"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">has_key</span></code></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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