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boost_fusion/doc/html/fusion/sequence/operator/comparison/equal.html
Christopher Schmidt cd811f56bc Fusion: merge from trunk 
[SVN r67492]
2010-12-29 19:54:59 +00:00

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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>equal</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
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<div class="section">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequence.operator.comparison.equal"></a><a class="link" href="equal.html" title="equal">equal</a>
</h5></div></div></div>
<a name="fusion.sequence.operator.comparison.equal.description"></a><h6>
<a name="id864659"></a>
<a class="link" href="equal.html#fusion.sequence.operator.comparison.equal.description">Description</a>
</h6>
<p>
Compare two sequences for equality.
</p>
<a name="fusion.sequence.operator.comparison.equal.synopsis"></a><h6>
<a name="id864677"></a>
<a class="link" href="equal.html#fusion.sequence.operator.comparison.equal.synopsis">Synopsis</a>
</h6>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Seq1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Seq2</span><span class="special">&gt;</span>
<span class="keyword">bool</span>
<span class="keyword">operator</span><span class="special">==(</span><span class="identifier">Seq1</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">a</span><span class="special">,</span> <span class="identifier">Seq2</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">b</span><span class="special">);</span>
</pre>
<a name="fusion.sequence.operator.comparison.equal.parameters"></a><h6>
<a name="id864784"></a>
<a class="link" href="equal.html#fusion.sequence.operator.comparison.equal.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">a</span><span class="special">,</span>
<span class="identifier">b</span></code>
</p>
</td>
<td>
<p>
Instances of <a class="link" href="../../../sequence.html" title="Sequence">Sequence</a>
</p>
</td>
<td>
<p>
<a class="link" href="../../../sequence.html" title="Sequence">Sequence</a>(s) to compare
</p>
</td>
</tr></tbody>
</table></div>
<a name="fusion.sequence.operator.comparison.equal.expression_semantics"></a><h6>
<a name="id864892"></a>
<a class="link" href="equal.html#fusion.sequence.operator.comparison.equal.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting"><span class="identifier">a</span> <span class="special">==</span> <span class="identifier">b</span>
</pre>
<p>
<span class="bold"><strong>Return type</strong></span>: <code class="computeroutput"><span class="keyword">bool</span></code>
</p>
<p>
<span class="bold"><strong>Requirements</strong></span>:
</p>
<p>
For each element, <code class="computeroutput"><span class="identifier">e1</span></code>,
in sequence <code class="computeroutput"><span class="identifier">a</span></code>, and for
each element, <code class="computeroutput"><span class="identifier">e2</span></code>, in
sequence <code class="computeroutput"><span class="identifier">b</span></code>, <code class="computeroutput"><span class="identifier">a</span> <span class="special">==</span> <span class="identifier">b</span></code> is a valid expression returning a
type that is convertible to bool.
</p>
<p>
An attempt to compare two Sequences of different lengths results in a
compile time error.
</p>
<p>
<span class="bold"><strong>Semantics</strong></span>:
</p>
<p>
For each element, <code class="computeroutput"><span class="identifier">e1</span></code>,
in sequence <code class="computeroutput"><span class="identifier">a</span></code>, and for
each element, <code class="computeroutput"><span class="identifier">e2</span></code>, in
sequence <code class="computeroutput"><span class="identifier">b</span></code>, <code class="computeroutput"><span class="identifier">e1</span> <span class="special">==</span> <span class="identifier">e2</span></code> returns true. For any 2 zero length
<span class="underline">_sequence</span>_s, e and f, e == f returns
true.
</p>
<a name="fusion.sequence.operator.comparison.equal.header"></a><h6>
<a name="id865066"></a>
<a class="link" href="equal.html#fusion.sequence.operator.comparison.equal.header">Header</a>
</h6>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</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">comparison</span><span class="special">/</span><span class="identifier">equal_to</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</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">equal_to</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequence.operator.comparison.equal.example"></a><h6>
<a name="id865181"></a>
<a class="link" href="equal.html#fusion.sequence.operator.comparison.equal.example">Example</a>
</h6>
<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">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">v1</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="char">'a'</span><span class="special">);</span>
<a class="link" href="../../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">v2</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="char">'a'</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">v1</span> <span class="special">==</span> <span class="identifier">v2</span><span class="special">);</span>
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright &#169; 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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