forked from boostorg/fusion
merge from trunk
[SVN r61189]
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
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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 V1.75.0">
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<meta name="generator" content="DocBook XSL Stylesheets V1.75.1">
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<link rel="home" href="../../../../index.html" title="Chapter 1. Fusion 2.0">
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<link rel="up" href="../functions.html" title="Functions">
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<link rel="prev" href="end.html" title="end">
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<a name="fusion.sequence.intrinsic.functions.empty"></a><a class="link" href="empty.html" title="empty">empty</a>
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</h5></div></div></div>
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<a name="fusion.sequence.intrinsic.functions.empty.description"></a><h6>
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<a name="id605120"></a>
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<a name="id705897"></a>
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<a class="link" href="empty.html#fusion.sequence.intrinsic.functions.empty.description">Description</a>
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</h6>
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<p>
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the sequence is empty, 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.empty.synopsis"></a><h6>
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<a name="id705937"></a>
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<a class="link" href="empty.html#fusion.sequence.intrinsic.functions.empty.synopsis">Synopsis</a>
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</h6>
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<pre class="programlisting"><span class="keyword">template</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="identifier">empty</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.empty.parameters"></a><h6>
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<a class="link" href="empty.html#fusion.sequence.intrinsic.functions.empty.parameters">Parameters</a>
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</h6>
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<div class="informaltable"><table class="table">
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</colgroup>
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<thead><tr>
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<th>
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<p>
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Parameter
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</p>
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<p>
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Parameter
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</p>
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</th>
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<th>
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<p>
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Requirement
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</p>
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<p>
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Requirement
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</p>
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</th>
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<th>
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<p>
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Description
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</p>
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<p>
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Description
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</p>
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</th>
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</tr></thead>
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<tbody><tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">seq</span></code>
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</p>
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<p>
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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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<p>
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Model of <a class="link" href="../../concepts/forward_sequence.html" title="Forward Sequence">Forward
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Sequence</a>
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</p>
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<p>
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Model of <a class="link" href="../../concepts/forward_sequence.html" title="Forward Sequence">Forward
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Sequence</a>
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</p>
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</td>
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<td>
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<p>
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The sequence we wish to investigate.
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</p>
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<p>
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The sequence we wish to investigate.
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</p>
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</td>
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</tr></tbody>
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</table></div>
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<a name="fusion.sequence.intrinsic.functions.empty.expression_semantics"></a><h6>
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<a name="id706135"></a>
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<a class="link" href="empty.html#fusion.sequence.intrinsic.functions.empty.expression_semantics">Expression
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Semantics</a>
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</h6>
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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.empty.header"></a><h6>
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<a name="id605427"></a>
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<a name="id706209"></a>
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<a class="link" href="empty.html#fusion.sequence.intrinsic.functions.empty.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">empty</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">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.sequence.intrinsic.functions.empty.example"></a><h6>
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<a name="id607250"></a>
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<a class="link" href="empty.html#fusion.sequence.intrinsic.functions.empty.example">Example</a>
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</h6>
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<pre class="programlisting"><a class="link" 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">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">></span> <span class="identifier">v</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="number">3</span><span class="special">);</span>
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