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boost_fusion/doc/html/fusion/algorithm/query/metafunctions/count.html
Joel de Guzman ef1e821173 added info on how to map to and from MPL 
[SVN r47647]
2008-07-21 07:25:52 +00:00

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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>count</title>
<link rel="stylesheet" href="../../../../../../../../doc/html/boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter 1. Fusion 2.0">
<link rel="up" href="../metafunctions.html" title="Metafunctions">
<link rel="prev" href="find_if.html" title="find_if">
<link rel="next" href="count_if.html" title="count_if">
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<div class="spirit-nav">
<a accesskey="p" href="find_if.html"><img src="../../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../../../../../doc/html/images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../../../../../doc/html/images/home.png" alt="Home"></a><a accesskey="n" href="count_if.html"><img src="../../../../../../../../doc/html/images/next.png" alt="Next"></a>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithm.query.metafunctions.count"></a><a href="count.html" title="count">count</a></h5></div></div></div>
<a name="fusion.algorithm.query.metafunctions.count.description"></a><h6>
<a name="id600030"></a>
<a href="count.html#fusion.algorithm.query.metafunctions.count.description">Description</a>
</h6>
<p>
A metafunction that returns the result type of <tt class="computeroutput"><span class="identifier">count</span></tt>
given the sequence and search types.
</p>
<a name="fusion.algorithm.query.metafunctions.count.synopsis"></a><h6>
<a name="id600074"></a>
<a href="count.html#fusion.algorithm.query.metafunctions.count.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">Sequence</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">T</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">count</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">int</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="table">
<a name="id600194"></a><p class="title"><b>Table 1.51. Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
heading Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">Sequence</span></tt>
</p>
</td>
<td>
<p>
A model of <a href="../../../sequence/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</p>
</td>
<td>
<p>
Operation's argument
</p>
</td>
</tr>
<tr>
<td>
<p>
<tt class="computeroutput"><span class="identifier">T</span></tt>
</p>
</td>
<td>
<p>
Any type
</p>
</td>
<td>
<p>
Operation's argument
</p>
</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithm.query.metafunctions.count.expression_semantics"></a><h6>
<a name="id600333"></a>
<a href="count.html#fusion.algorithm.query.metafunctions.count.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="count.html" title="count"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">count</span></tt></a><span class="special">&lt;</span><span class="identifier">T</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">int</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the return type of
<a href="../functions/count.html" title="count"><tt class="computeroutput"><span class="identifier">count</span></tt></a>. The return type is always
<tt class="computeroutput"><span class="keyword">int</span></tt>.
</p>
<a name="fusion.algorithm.query.metafunctions.count.complexity"></a><h6>
<a name="id600476"></a>
<a href="count.html#fusion.algorithm.query.metafunctions.count.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithm.query.metafunctions.count.header"></a><h6>
<a name="id600505"></a>
<a href="count.html#fusion.algorithm.query.metafunctions.count.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">algorithm</span><span class="special">/</span><span class="identifier">query</span><span class="special">/</span><span class="identifier">count</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">count</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</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 © 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>)
</p>
</div></td>
</tr></table>
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