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https://svn.boost.org/svn/boost/trunk ........ r40862 | dave | 2007-11-06 15:39:09 -0800 (Tue, 06 Nov 2007) | 2 lines Added missing copyright/license ........ r40863 | djowel | 2007-11-06 18:12:28 -0800 (Tue, 06 Nov 2007) | 1 line added copyright and license info for each page. ........ r40864 | aaron_windsor | 2007-11-06 18:30:38 -0800 (Tue, 06 Nov 2007) | 1 line Shortening file name of a graph test to < 32 characters ........ r40865 | djowel | 2007-11-06 18:34:18 -0800 (Tue, 06 Nov 2007) | 1 line added license info in copyright notice at the footer ........ r40866 | djowel | 2007-11-06 19:06:23 -0800 (Tue, 06 Nov 2007) | 1 line added license info in copyright notice at the footer ........ r40867 | djowel | 2007-11-06 19:23:31 -0800 (Tue, 06 Nov 2007) | 1 line added license info in copyright notice at the footer ........ r40868 | djowel | 2007-11-06 19:25:59 -0800 (Tue, 06 Nov 2007) | 1 line added copyright and license info for each page. ........ r40869 | djowel | 2007-11-06 19:27:38 -0800 (Tue, 06 Nov 2007) | 1 line added license info in copyright notice at the footer ........ r40870 | djowel | 2007-11-06 19:30:01 -0800 (Tue, 06 Nov 2007) | 1 line added copyright and license info for each page. ........ r40871 | djowel | 2007-11-06 19:35:49 -0800 (Tue, 06 Nov 2007) | 1 line added copyright and license info for each page. ........ r40872 | djowel | 2007-11-06 19:37:51 -0800 (Tue, 06 Nov 2007) | 1 line added copyright and license info for each page. ........ r40873 | djowel | 2007-11-06 19:46:23 -0800 (Tue, 06 Nov 2007) | 1 line added copyright and license info for each page. ........ r40874 | chris_kohlhoff | 2007-11-06 22:49:36 -0800 (Tue, 06 Nov 2007) | 2 lines Add copyright notice. ........ r40875 | chris_kohlhoff | 2007-11-06 22:53:17 -0800 (Tue, 06 Nov 2007) | 2 lines Add myself as asio maintainer. ........ r40876 | chris_kohlhoff | 2007-11-06 23:23:53 -0800 (Tue, 06 Nov 2007) | 2 lines Add asio. ........ r40877 | joaquin | 2007-11-07 00:45:27 -0800 (Wed, 07 Nov 2007) | 1 line reapplied change at rev 40284 ........ r40878 | johnmaddock | 2007-11-07 02:07:08 -0800 (Wed, 07 Nov 2007) | 1 line Ooops, got the pp-logic wrong and disable long double support for all Unix platforms, instead of just Intel on Linux prior to version 10. ........ r40879 | johnmaddock | 2007-11-07 02:09:50 -0800 (Wed, 07 Nov 2007) | 1 line Fix calls to fpclassify so they don't trigger macro expansion when fpclassify is a macro. ........ r40880 | t_schwinger | 2007-11-07 02:14:42 -0800 (Wed, 07 Nov 2007) | 3 lines adds FunctionTypes ........ r40881 | johnmaddock | 2007-11-07 03:50:02 -0800 (Wed, 07 Nov 2007) | 1 line Change test (again) so that the range of values tested matches original test: last change started testing more extreme input values, which caused regressions on Mac OS X. ........ r40882 | johnmaddock | 2007-11-07 03:59:39 -0800 (Wed, 07 Nov 2007) | 3 lines Disabled use of long double when BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS is defined. Disabled special-double precision error rates when BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS is defined. ........ r40883 | johnmaddock | 2007-11-07 04:04:01 -0800 (Wed, 07 Nov 2007) | 1 line Oops get the name of test right! ........ r40884 | anthonyw | 2007-11-07 04:10:17 -0800 (Wed, 07 Nov 2007) | 1 line Added missing licence and copyright ........ r40885 | garcia | 2007-11-07 04:25:16 -0800 (Wed, 07 Nov 2007) | 2 lines added logging library. ........ r40886 | garcia | 2007-11-07 05:38:53 -0800 (Wed, 07 Nov 2007) | 2 lines Exception was accepted. ........ r40887 | fcacciola | 2007-11-07 06:12:15 -0800 (Wed, 07 Nov 2007) | 1 line Added explicit failures for newly discovered GCC const ref binding bug (see Ticket #1301) ........ [SVN r40891]
169 lines
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169 lines
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<html>
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<head>
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<a accesskey="p" href="find_if.html"><img src="../../../../../../../../doc/html/images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.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>
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h5 class="title">
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<a name="fusion.algorithm.query.functions.count"></a><a href="count.html" title="count">count</a></h5></div></div></div>
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<a name="fusion.algorithm.query.functions.count.description"></a><h6>
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<a name="id589255"></a>
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<a href="count.html#fusion.algorithm.query.functions.count.description">Description</a>
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</h6>
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<p>
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Returns the number of elements of a given type within a sequence.
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</p>
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<a name="fusion.algorithm.query.functions.count.synopsis"></a><h6>
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<a name="id589287"></a>
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<a href="count.html#fusion.algorithm.query.functions.count.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>
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<span class="keyword">typename</span> <span class="identifier">Sequence</span><span class="special">,</span>
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<span class="keyword">typename</span> <span class="identifier">T</span>
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<span class="special">></span>
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<span class="keyword">typename</span> <a href="../metafunctions/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"><</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">T</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">count</span><span class="special">(</span>
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<span class="identifier">Sequence</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">T</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">t</span><span class="special">);</span>
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</pre>
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<div class="table">
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<a name="id589494"></a><p class="title"><b>Table 1.44. 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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<col>
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<col>
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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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</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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</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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</th>
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</tr></thead>
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<tbody>
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<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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</p>
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</td>
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<td>
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<p>
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A model of <a href="../../../sequence/concepts/forward_sequence.html" title="Forward
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Sequence">Forward
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Sequence</a>, <tt class="computeroutput"><span class="identifier">e</span> <span class="special">==</span> <span class="identifier">t</span></tt>
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must be a valid expression, convertible to <tt class="computeroutput"><span class="keyword">bool</span></tt>,
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for each element <tt class="computeroutput"><span class="identifier">e</span></tt>
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in <tt class="computeroutput"><span class="identifier">seq</span></tt>
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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 to search
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<tt class="computeroutput"><span class="identifier">T</span></tt>
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</p>
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</td>
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<td>
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<p>
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Any type
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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 type to count
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</p>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<a name="fusion.algorithm.query.functions.count.expression_semantics"></a><h6>
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<a name="id589691"></a>
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<a href="count.html#fusion.algorithm.query.functions.count.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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<a href="count.html" title="count"><tt class="computeroutput"><span class="identifier">count</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">t</span><span class="special">);</span>
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</pre>
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<p>
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<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">int</span></tt>
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</p>
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<p>
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<span class="bold"><b>Semantics</b></span>: Returns the number of elements
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of type <tt class="computeroutput"><span class="identifier">T</span></tt> and equal to
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<tt class="computeroutput"><span class="identifier">t</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>.
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</p>
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<a name="fusion.algorithm.query.functions.count.complexity"></a><h6>
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<a name="id589835"></a>
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<a href="count.html#fusion.algorithm.query.functions.count.complexity">Complexity</a>
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</h6>
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<p>
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Linear. At most <tt class="computeroutput"><a href="../../../sequence/intrinsic/metafunctions/size.html" title="size"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span></tt></a><span class="special"><</span><span class="identifier">Sequence</span><span class="special">>::</span><span class="identifier">value</span></tt> comparisons.
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</p>
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<a name="fusion.algorithm.query.functions.count.header"></a><h6>
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<a name="id589919"></a>
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<a href="count.html#fusion.algorithm.query.functions.count.header">Header</a>
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</h6>
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<pre class="programlisting">
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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">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">></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">count</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.algorithm.query.functions.count.example"></a><h6>
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<a name="id590088"></a>
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<a href="count.html#fusion.algorithm.query.functions.count.example">Example</a>
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</h6>
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<pre class="programlisting">
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<span class="keyword">const</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">double</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">vec</span><span class="special">(</span><span class="number">1.0</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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<span class="identifier">assert</span><span class="special">(</span><a href="count.html" title="count"><tt class="computeroutput"><span class="identifier">count</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">,</span><span class="number">2</span><span class="special">)</span> <span class="special">==</span> <span class="number">1</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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<td align="left"></td>
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<td align="right"><div class="copyright-footer"><small>Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Schwinger<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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