forked from boostorg/fusion
introduces documentation for deduce / deduce_sequence
[SVN r36813]
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>empty</title>
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<link rel="stylesheet" href="../../../../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="end.html" title="end">
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<div class="titlepage"><div><div><h5 class="title">
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<a name="fusion.sequences.intrinsics.metafunctions.empty"></a><a href="empty.html" title="empty">empty</a></h5></div></div></div>
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<a name="fusion.sequences.intrinsics.metafunctions.empty.description"></a><h6>
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<a name="id514296"></a>
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<a name="id1012831"></a>
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<a href="empty.html#fusion.sequences.intrinsics.metafunctions.empty.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/empty.html" title="empty"><tt class="computeroutput"><span class="identifier">empty</span></tt></a>.
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Returns the result type of <a href="../functions/empty.html" title="empty"><code class="computeroutput"><span class="identifier">empty</span></code></a>.
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</p>
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<a name="fusion.sequences.intrinsics.metafunctions.empty.synopsis"></a><h6>
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<a name="id514344"></a>
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<a name="id1012873"></a>
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<a href="empty.html#fusion.sequences.intrinsics.metafunctions.empty.synopsis">Synopsis</a>
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</h6>
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<pre class="programlisting">
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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="id514442"></a><p class="title"><b>Table<EFBFBD>1.21.<2E>Parameters</b></p>
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<a name="id1012959"></a><p class="title"><b>Table<EFBFBD>1.21.<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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<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">Seq</span></tt></td>
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<td><code class="computeroutput"><span class="identifier">Seq</span></code></td>
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<td>A
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model of <a href="../../concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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</table>
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</div>
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<a name="fusion.sequences.intrinsics.metafunctions.empty.expression_semantics"></a><h6>
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<a name="id514516"></a>
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<a name="id1013026"></a>
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<a href="empty.html#fusion.sequences.intrinsics.metafunctions.empty.expression_semantics">Expression
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Semantics</a>
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</h6>
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<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">empty</span><span class="special"><</span><span class="identifier">Seq</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 MPL Integral Constant
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<span class="bold"><strong>Return type</strong></span>: An MPL Integral Constant
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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> has zero elements,
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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> has zero elements,
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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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<a name="fusion.sequences.intrinsics.metafunctions.empty.header"></a><h6>
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<a name="id514659"></a>
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<a name="id1013033"></a>
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<a href="empty.html#fusion.sequences.intrinsics.metafunctions.empty.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">empty</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.sequences.intrinsics.metafunctions.empty.example"></a><h6>
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<a name="id514765"></a>
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<a name="id1013245"></a>
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<a href="empty.html#fusion.sequences.intrinsics.metafunctions.empty.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="../../containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special"><></span> <span class="identifier">empty_vec</span><span class="special">;</span>
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<span class="keyword">typedef</span> <a href="../../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="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="keyword">typedef</span> <a href="../../containers/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special"><></span> <span class="identifier">empty_vec</span><span class="special">;</span>
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<span class="keyword">typedef</span> <a href="../../containers/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></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><a href="empty.html" title="empty"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">empty</span></tt></a><span class="special"><</span><span class="identifier">empty_vec</span><span class="special">>));</span>
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<span class="identifier">BOOST_MPL_ASSERT_NOT</span><span class="special">((</span><a href="empty.html" title="empty"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">empty</span></tt></a><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><a href="empty.html" title="empty"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">empty</span></code></a><span class="special"><</span><span class="identifier">empty_vec</span><span class="special">>));</span>
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<span class="identifier">BOOST_MPL_ASSERT_NOT</span><span class="special">((</span><a href="empty.html" title="empty"><code class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">empty</span></code></a><span class="special"><</span><span class="identifier">vec</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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