forked from boostorg/fusion
updates functional module: only two unfused variants, now
[SVN r51381]
This commit is contained in:
Tobias Schwinger
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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="../functions.html" title="Functions">
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<link rel="prev" href="at_c.html" title="at_c">
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@ -26,26 +26,25 @@
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<div class="titlepage"><div><div><h5 class="title">
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<a name="fusion.sequence.intrinsic.functions.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.functions.has_key.description"></a><h6>
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<a name="id505696"></a>
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<a name="id1031328"></a>
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<a href="has_key.html#fusion.sequence.intrinsic.functions.has_key.description">Description</a>
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</h6>
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<p>
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Returns a type convertible to <tt class="computeroutput"><span class="keyword">bool</span></tt>
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that evaluates to <tt class="computeroutput"><span class="keyword">true</span></tt> if
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Returns a type convertible to <code class="computeroutput"><span class="keyword">bool</span></code>
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that evaluates to <code class="computeroutput"><span class="keyword">true</span></code> if
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the sequence contains an element associated with a Key, else, evaluates
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to <tt class="computeroutput"><span class="keyword">false</span></tt>.
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to <code class="computeroutput"><span class="keyword">false</span></code>.
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</p>
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<a name="fusion.sequence.intrinsic.functions.has_key.synopsis"></a><h6>
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<a name="id505764"></a>
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<a name="id1031389"></a>
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<a href="has_key.html#fusion.sequence.intrinsic.functions.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><span class="keyword">typename</span> <span class="identifier">Key</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">></span>
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<span class="keyword">typename</span> <a href="../metafunctions/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">Sequence</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="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Key</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">></span>
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<span class="keyword">typename</span> <a href="../metafunctions/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">Sequence</span><span class="special">,</span> <span class="identifier">Key</span><span class="special">>::</span><span class="identifier">type</span>
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<span class="identifier">has_key</span><span class="special">(</span><span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">seq</span><span class="special">);</span>
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</pre>
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<a name="fusion.sequence.intrinsic.functions.has_key.parameters"></a><h6>
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<a name="id505948"></a>
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<a name="id1031550"></a>
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<a href="has_key.html#fusion.sequence.intrinsic.functions.has_key.parameters">Parameters</a>
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</h6>
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<div class="informaltable"><table class="table">
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@ -75,7 +74,7 @@
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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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@ -94,7 +93,7 @@
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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 +110,31 @@
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</tbody>
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</table></div>
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<a name="fusion.sequence.intrinsic.functions.has_key.expression_semantics"></a><h6>
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<a name="id506102"></a>
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<a name="id1031689"></a>
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<a href="has_key.html#fusion.sequence.intrinsic.functions.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">has_key</span><span class="special"><</span><span class="identifier">Key</span><span class="special">>(</span><span class="identifier">seq</span><span class="special">);</span>
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<pre class="programlisting"><span class="identifier">has_key</span><span class="special"><</span><span class="identifier">Key</span><span class="special">>(</span><span class="identifier">seq</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>: Convertible to <tt class="computeroutput"><span class="keyword">bool</span></tt>.
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<span class="bold"><strong>Return type</strong></span>: Convertible to <code class="computeroutput"><span class="keyword">bool</span></code>.
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</p>
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<p>
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<span class="bold"><b>Semantics</b></span>: Evaluates to <tt class="computeroutput"><span class="keyword">true</span></tt> if the sequence contains an element
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associated with Key, else, evaluates to <tt class="computeroutput"><span class="keyword">false</span></tt>.
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<span class="bold"><strong>Semantics</strong></span>: Evaluates to <code class="computeroutput"><span class="keyword">true</span></code> if the sequence contains an element
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associated with Key, else, evaluates to <code class="computeroutput"><span class="keyword">false</span></code>.
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</p>
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<a name="fusion.sequence.intrinsic.functions.has_key.header"></a><h6>
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<a name="id506227"></a>
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<a name="id1031797"></a>
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<a href="has_key.html#fusion.sequence.intrinsic.functions.has_key.header">Header</a>
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</h6>
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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">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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<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.functions.has_key.example"></a><h6>
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<a name="id506397"></a>
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<a name="id1031946"></a>
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<a href="has_key.html#fusion.sequence.intrinsic.functions.has_key.example">Example</a>
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</h6>
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<pre class="programlisting">
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<a href="../../../container/set.html" title="set"><tt class="computeroutput"><span class="identifier">set</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> <span class="keyword">bool</span><span class="special">></span> <span class="identifier">s</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="char">'x'</span><span class="special">,</span> <span class="keyword">true</span><span class="special">);</span>
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<pre class="programlisting"><a href="../../../container/set.html" title="set"><code class="computeroutput"><span class="identifier">set</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> <span class="keyword">bool</span><span class="special">></span> <span class="identifier">s</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="char">'x'</span><span class="special">,</span> <span class="keyword">true</span><span class="special">);</span>
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<span class="identifier">assert</span><span class="special">(</span><span class="identifier">has_key</span><span class="special"><</span><span class="keyword">char</span><span class="special">>(</span><span class="identifier">s</span><span class="special">)</span> <span class="special">==</span> <span class="keyword">true</span><span class="special">);</span>
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</pre>
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</div>
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