Added libs/mpl

[SVN r15384]

doc/ref/Reference/count_if.html

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+<!doctype html public "-//ietf//dtd html//en">
+<html><head><title>boost::mpl::Reference/count if</title>
+<link rel="stylesheet" href="../mpl_wiki.css">
+</head><body bgcolor="white">
+<h1><a href="../Table_of_Content.html"><img src="../mpl_logo.jpg" alt="[Home]" border=0 align="right"></a>count_if</h1><h3>Synopsis</h3>
+<p>
+<pre>
+template&lt;
+      typename Sequence
+    , typename Pred
+    &gt;
+struct count_if
+{
+    typedef <em>unspecified</em> type;
+};
+</pre>
+<p>
+<h3>Description</h3>
+<p>
+Returns the number of elements in a <code>Sequence</code> that satisfy the predicate <code>Pred</code>.
+<p>
+<h3>Definition</h3>
+<p>
+<pre>
+#include "<a href="../../../../../\boost/mpl/count_if.hpp">boost/mpl/count_if.hpp</a>"
+</pre>
+<p>
+<h3>Parameters</h3>
+<table border="1">
+<tr><th>&nbsp;Parameter&nbsp;</th><th>&nbsp;Requirement&nbsp;</th><th>&nbsp;Description &nbsp;</th></tr>
+<tr><td><code>Sequence</code></td><td>A model of <a href="../Forward_Sequence.html">Forward Sequence</a></td><td>A sequence to be examined. </td></tr>
+<tr><td><code>Pred</code></td><td>A model of Predicate [Lambda Expression]</td><td>The count condition. </td></tr>
+</table>
+<p>
+<h3>Expression semantics</h3>
+<p>
+<table border="1">
+<tr><th>&nbsp;Expression&nbsp;</th><th>&nbsp;Expression&nbsp;type&nbsp;</th><th>&nbsp;Precondition&nbsp;</th><th>&nbsp;Semantics&nbsp;</th><th>&nbsp;Postcondition&nbsp;</th></tr>
+<tr><td><code>typedef count_if&lt;Sequence,Pred&gt;::type n;</code></td><td>A model of <a href="../Integral_Constant.html">Integral Constant</a></td><td></td><td>Equivalent to <code> typedef lambda&lt;Pred&gt;::type pred; typedef <a href="../Reference/fold.html">fold</a>&lt; Sequence,integral_c&lt;unsigned long,0&gt;,if_&lt;pred,<a href="../Reference/next.html">next</a>&lt;_1&gt;,_1&gt; &gt;::type n;</code></td><td></td></tr>
+</table>
+<p>
+<p>
+<h3>Complexity</h3>
+<p>
+Linear. Exactly <code><a href="../Reference/size.html">size</a>&lt;Sequence&gt;::value</code> applications of <code>Pred</code>. 
+<p>
+<h3>Example</h3>
+<p>
+<pre>
+typedef <a href="../Reference/list.html">list</a>&lt;int,char,long,short,char,long,double,long&gt; types;
+<p>
+BOOST_STATIC_ASSERT((count_if&lt; types,boost::is_float&lt;_&gt; &gt;::type::value == 1));
+BOOST_STATIC_ASSERT((count_if&lt; types,boost::is_same&lt;_,char&gt; &gt;::type::value == 2));
+BOOST_STATIC_ASSERT((count_if&lt; types,boost::is_same&lt;_,void&gt; &gt;::type::value == 0));
+</pre>
+<p>
+<h3>See also</h3>
+<p>
+<a href="../Algorithms.html">Algorithms</a>, <code><a href="../Reference/count.html">count</a></code>, <code><a href="../Reference/find_if.html">find_if</a></code>, <code><a href="../Reference/find.html">find</a></code>, <code><a href="../Reference/contains.html">contains</a></code>
+<p><hr>
+<a href="../Table_of_Content.html">Table of Content</a> | <a href="../Reference.html">Reference</a><br>Last edited July 17, 2002 4:32 am</body></html>