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>empty</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="end.html" title="end">
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<div class="titlepage"><div><div><h5 class="title">
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<a name="fusion.sequence.intrinsic.metafunctions.empty"></a><a href="empty.html" title="empty">empty</a></h5></div></div></div>
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<a name="fusion.sequence.intrinsic.metafunctions.empty.description"></a><h6>
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<a name="id509917"></a>
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<a name="id1035053"></a>
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<a href="empty.html#fusion.sequence.intrinsic.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.sequence.intrinsic.metafunctions.empty.synopsis"></a><h6>
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<a name="id509966"></a>
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<a name="id1035096"></a>
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<a href="empty.html#fusion.sequence.intrinsic.metafunctions.empty.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">Seq</span><span class="special">></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">Seq</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">empty</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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<div class="table">
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<a name="id510066"></a><p class="title"><b>Table<EFBFBD>1.21.<2E>Parameters</b></p>
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<a name="id1035183"></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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@ -71,7 +70,7 @@
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<tbody><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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</table>
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</div>
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<a name="fusion.sequence.intrinsic.metafunctions.empty.expression_semantics"></a><h6>
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<a name="id510168"></a>
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<a name="id1035276"></a>
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<a href="empty.html#fusion.sequence.intrinsic.metafunctions.empty.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">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 class="programlisting"><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 <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> 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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<p>
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/sequence/intrinsic/empty.hpp>
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</p>
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<a name="fusion.sequence.intrinsic.metafunctions.empty.example"></a><h6>
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<a name="id510330"></a>
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<a name="id1035417"></a>
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<a href="empty.html#fusion.sequence.intrinsic.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="../../../container/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="../../../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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<pre class="programlisting"><span class="keyword">typedef</span> <a href="../../../container/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="../../../container/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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