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boost_fusion/doc/html/fusion/sequences/operators/comparison/equal.html
Joel de Guzman 6ca462baa0 doc updates 
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2006-10-30 01:20:23 +00:00

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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>equal</title>
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<link rel="start" href="../../../../index.html" title="Chapter 1. Fusion 2.0">
<link rel="up" href="../comparison.html" title="Comparison">
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequences.operators.comparison.equal"></a><a href="equal.html" title="equal">equal</a></h5></div></div></div>
<a name="fusion.sequences.operators.comparison.equal.description"></a><h6>
<a name="id543976"></a>
<a href="equal.html#fusion.sequences.operators.comparison.equal.description">Description</a>
</h6>
<p>
Compare two sequences for equality.
</p>
<a name="fusion.sequences.operators.comparison.equal.synopsis"></a><h6>
<a name="id544007"></a>
<a href="equal.html#fusion.sequences.operators.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.sequences.operators.comparison.equal.parameters"></a><h6>
<a name="id544160"></a>
<a href="equal.html#fusion.sequences.operators.comparison.equal.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>Description</th>
</tr></thead>
<tbody><tr>
<td><tt class="computeroutput"><span class="identifier">a</span><span class="special">,</span> <span class="identifier">b</span></tt></td>
<td>Instances of
<a href="../../../sequences.html" title="Sequences">Sequence</a>
</td>
<td>
<span class="underline">_sequence</span>_s to compare</td>
</tr></tbody>
</table></div>
<a name="fusion.sequences.operators.comparison.equal.expression_semantics"></a><h6>
<a name="id544264"></a>
<a href="equal.html#fusion.sequences.operators.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"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">bool</span></tt>
</p>
<p>
<span class="bold"><b>Requirements</b></span>:
</p>
<p>
For each element, <tt class="computeroutput"><span class="identifier">e1</span></tt>,
in sequence <tt class="computeroutput"><span class="identifier">a</span></tt>, and for
each element, <tt class="computeroutput"><span class="identifier">e2</span></tt>, in
sequence <tt class="computeroutput"><span class="identifier">b</span></tt>, <tt class="computeroutput"><span class="identifier">a</span> <span class="special">==</span> <span class="identifier">b</span></tt> 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"><b>Semantics</b></span>:
</p>
<p>
For each element, <tt class="computeroutput"><span class="identifier">e1</span></tt>,
in sequence <tt class="computeroutput"><span class="identifier">a</span></tt>, and for
each element, <tt class="computeroutput"><span class="identifier">e2</span></tt>, in
sequence <tt class="computeroutput"><span class="identifier">b</span></tt>, <tt class="computeroutput"><span class="identifier">e1</span> <span class="special">==</span> <span class="identifier">e2</span></tt> returns true. For any 2 zero length
<span class="underline">_sequence</span>_s, e and f, e == f returns
true.
</p>
<a name="fusion.sequences.operators.comparison.equal.header"></a><h6>
<a name="id544509"></a>
<a href="equal.html#fusion.sequences.operators.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>
</pre>
<a name="fusion.sequences.operators.comparison.equal.example"></a><h6>
<a name="id544615"></a>
<a href="equal.html#fusion.sequences.operators.comparison.equal.example">Example</a>
</h6>
<pre class="programlisting">
<a href="../../containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></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 href="../../containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></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>
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<td align="right"><small>Copyright © 2001-2005 Joel de Guzman, Dan Marsden</small></td>
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