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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>all</title>
<link rel="stylesheet" href="../../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
<link rel="up" href="../metafunctions.html" title="Metafunctions">
<link rel="prev" href="any.html" title="any">
<link rel="next" href="none.html" title="none">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%">
<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td>
<td align="center"><a href="../../../../../../../../index.htm">Home</a></td>
<td align="center"><a href="../../../../../../../libraries.htm">Libraries</a></td>
<td align="center"><a href="../../../../../../../../people/people.htm">People</a></td>
<td align="center"><a href="../../../../../../../../more/faq.htm">FAQ</a></td>
<td align="center"><a href="../../../../../../../../more/index.htm">More</a></td>
</table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="any.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="none.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.metafunctions.all"></a><a href="all.html" title="all">all</a></h5></div></div></div>
<a name="fusion.algorithms.query.metafunctions.all.description"></a><h6>
<a name="id560604"></a>
<a href="all.html#fusion.algorithms.query.metafunctions.all.description">Description</a>
</h6>
<p>
A metafunction returning the result type of <a href="../functions/all.html" title="all"><tt class="computeroutput"><span class="identifier">all</span></tt></a>.
</p>
<a name="fusion.algorithms.query.metafunctions.all.synopsis"></a><h6>
<a name="id560652"></a>
<a href="all.html#fusion.algorithms.query.metafunctions.all.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">F</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">all</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">bool</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="informaltable">
<h4>
<a name="id560777"></a>
<span class="table-title">Parameters</span>
</h4>
<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">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">F</span></tt></td>
<td>A
model of unary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a>
</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.metafunctions.all.expression_semantics"></a><h6>
<a name="id560883"></a>
<a href="all.html#fusion.algorithms.query.metafunctions.all.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="all.html" title="all"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">all</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">F</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">bool</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the return type of
<a href="../functions/all.html" title="all"><tt class="computeroutput"><span class="identifier">all</span></tt></a>
given a sequence of type <tt class="computeroutput"><span class="identifier">Sequence</span></tt>
and a unary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a> of type <tt class="computeroutput"><span class="identifier">F</span></tt>.
The return type is always <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<a name="fusion.algorithms.query.metafunctions.all.complexity"></a><h6>
<a name="id561064"></a>
<a href="all.html#fusion.algorithms.query.metafunctions.all.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.query.metafunctions.all.header"></a><h6>
<a name="id561095"></a>
<a href="all.html#fusion.algorithms.query.metafunctions.all.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">all</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"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="any.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="none.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
</body>
</html>

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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>any</title>
<link rel="stylesheet" href="../../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
<link rel="up" href="../metafunctions.html" title="Metafunctions">
<link rel="prev" href="../metafunctions.html" title="Metafunctions">
<link rel="next" href="all.html" title="all">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%">
<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td>
<td align="center"><a href="../../../../../../../../index.htm">Home</a></td>
<td align="center"><a href="../../../../../../../libraries.htm">Libraries</a></td>
<td align="center"><a href="../../../../../../../../people/people.htm">People</a></td>
<td align="center"><a href="../../../../../../../../more/faq.htm">FAQ</a></td>
<td align="center"><a href="../../../../../../../../more/index.htm">More</a></td>
</table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="../metafunctions.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="all.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.metafunctions.any"></a><a href="any.html" title="any">any</a></h5></div></div></div>
<a name="fusion.algorithms.query.metafunctions.any.description"></a><h6>
<a name="id559989"></a>
<a href="any.html#fusion.algorithms.query.metafunctions.any.description">Description</a>
</h6>
<p>
A metafunction returning the result type of <a href="../functions/any.html" title="any"><tt class="computeroutput"><span class="identifier">any</span></tt></a>.
</p>
<a name="fusion.algorithms.query.metafunctions.any.synopsis"></a><h6>
<a name="id560036"></a>
<a href="any.html#fusion.algorithms.query.metafunctions.any.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">F</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">any</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">bool</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="informaltable">
<h4>
<a name="id560161"></a>
<span class="table-title">Parameters</span>
</h4>
<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">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">F</span></tt></td>
<td>A
model of unary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a>
</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.metafunctions.any.expression_semantics"></a><h6>
<a name="id560269"></a>
<a href="any.html#fusion.algorithms.query.metafunctions.any.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="any.html" title="any"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">any</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">F</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">bool</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the return type of
<a href="../functions/any.html" title="any"><tt class="computeroutput"><span class="identifier">any</span></tt></a>
given a sequence of type <tt class="computeroutput"><span class="identifier">Sequence</span></tt>
and a unary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a> of type <tt class="computeroutput"><span class="identifier">F</span></tt>.
The return type is always <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<a name="fusion.algorithms.query.metafunctions.any.complexity"></a><h6>
<a name="id560449"></a>
<a href="any.html#fusion.algorithms.query.metafunctions.any.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.query.metafunctions.any.header"></a><h6>
<a name="id560480"></a>
<a href="any.html#fusion.algorithms.query.metafunctions.any.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">any</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"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="../metafunctions.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="all.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
</body>
</html>

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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="../../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>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">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%">
<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td>
<td align="center"><a href="../../../../../../../../index.htm">Home</a></td>
<td align="center"><a href="../../../../../../../libraries.htm">Libraries</a></td>
<td align="center"><a href="../../../../../../../../people/people.htm">People</a></td>
<td align="center"><a href="../../../../../../../../more/faq.htm">FAQ</a></td>
<td align="center"><a href="../../../../../../../../more/index.htm">More</a></td>
</table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="find_if.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="count_if.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.metafunctions.count"></a><a href="count.html" title="count">count</a></h5></div></div></div>
<a name="fusion.algorithms.query.metafunctions.count.description"></a><h6>
<a name="id563175"></a>
<a href="count.html#fusion.algorithms.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.algorithms.query.metafunctions.count.synopsis"></a><h6>
<a name="id563218"></a>
<a href="count.html#fusion.algorithms.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="informaltable">
<h4>
<a name="id563342"></a>
<span class="table-title">Parameters</span>
</h4>
<table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Parameter</th>
<th>Requirement</th>
<th>heading
Description</th>
</tr></thead>
<tbody>
<tr>
<td><tt class="computeroutput"><span class="identifier">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">T</span></tt></td>
<td>Any
type</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.metafunctions.count.expression_semantics"></a><h6>
<a name="id563441"></a>
<a href="count.html#fusion.algorithms.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.algorithms.query.metafunctions.count.complexity"></a><h6>
<a name="id563580"></a>
<a href="count.html#fusion.algorithms.query.metafunctions.count.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.query.metafunctions.count.header"></a><h6>
<a name="id563610"></a>
<a href="count.html#fusion.algorithms.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>
</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"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="find_if.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="count_if.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
</body>
</html>

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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>count_if</title>
<link rel="stylesheet" href="../../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
<link rel="up" href="../metafunctions.html" title="Metafunctions">
<link rel="prev" href="count.html" title="count">
<link rel="next" href="../../transformation.html" title="Transformation">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%">
<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td>
<td align="center"><a href="../../../../../../../../index.htm">Home</a></td>
<td align="center"><a href="../../../../../../../libraries.htm">Libraries</a></td>
<td align="center"><a href="../../../../../../../../people/people.htm">People</a></td>
<td align="center"><a href="../../../../../../../../more/faq.htm">FAQ</a></td>
<td align="center"><a href="../../../../../../../../more/index.htm">More</a></td>
</table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="count.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../transformation.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.metafunctions.count_if"></a><a href="count_if.html" title="count_if">count_if</a></h5></div></div></div>
<a name="fusion.algorithms.query.metafunctions.count_if.description"></a><h6>
<a name="id563736"></a>
<a href="count_if.html#fusion.algorithms.query.metafunctions.count_if.description">Description</a>
</h6>
<p>
A metafunction that returns the result type of <tt class="computeroutput"><span class="identifier">count_if</span></tt>
given the sequence and predicate types.
</p>
<a name="fusion.algorithms.query.metafunctions.count_if.synopsis"></a><h6>
<a name="id563779"></a>
<a href="count_if.html#fusion.algorithms.query.metafunctions.count_if.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">Pred</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">count_if</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="informaltable">
<h4>
<a name="id563903"></a>
<span class="table-title">Parameters</span>
</h4>
<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">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">Pred</span></tt></td>
<td>A
unary function object</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.metafunctions.count_if.expression_semantics"></a><h6>
<a name="id564003"></a>
<a href="count_if.html#fusion.algorithms.query.metafunctions.count_if.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="count_if.html" title="count_if"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">count_if</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">Pred</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_if.html" title="count_if"><tt class="computeroutput"><span class="identifier">count_if</span></tt></a>. The return type is
always <tt class="computeroutput"><span class="keyword">int</span></tt>.
</p>
<a name="fusion.algorithms.query.metafunctions.count_if.complexity"></a><h6>
<a name="id564154"></a>
<a href="count_if.html#fusion.algorithms.query.metafunctions.count_if.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.query.metafunctions.count_if.header"></a><h6>
<a name="id564185"></a>
<a href="count_if.html#fusion.algorithms.query.metafunctions.count_if.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_if</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"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="count.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="../../transformation.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>find</title>
<link rel="stylesheet" href="../../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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<div class="spirit-nav">
<a accesskey="p" href="none.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="find_if.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.metafunctions.find"></a><a href="find.html" title="find">find</a></h5></div></div></div>
<a name="fusion.algorithms.query.metafunctions.find.description"></a><h6>
<a name="id561838"></a>
<a href="find.html#fusion.algorithms.query.metafunctions.find.description">Description</a>
</h6>
<p>
Returns the result type of <tt class="computeroutput"><span class="identifier">find</span></tt>,
given the sequence and search types.
</p>
<a name="fusion.algorithms.query.metafunctions.find.synopsis"></a><h6>
<a name="id561879"></a>
<a href="find.html#fusion.algorithms.query.metafunctions.find.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">find</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="informaltable">
<h4>
<a name="id562001"></a>
<span class="table-title">Parameters</span>
</h4>
<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">Sequence</span></tt></td>
<td>Model
of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">T</span></tt></td>
<td>Any
type</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.metafunctions.find.expression_semantics"></a><h6>
<a name="id562100"></a>
<a href="find.html#fusion.algorithms.query.metafunctions.find.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="find.html" title="find"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">find</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</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>: A model of the same iterator
category as the iterators of <tt class="computeroutput"><span class="identifier">Sequence</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator to the
first element of type <tt class="computeroutput"><span class="identifier">T</span></tt>
in <tt class="computeroutput"><span class="identifier">Sequence</span></tt>, or <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/end.html" title="end"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">end</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span></tt> if there is no such element.
</p>
<a name="fusion.algorithms.query.metafunctions.find.complexity"></a><h6>
<a name="id562296"></a>
<a href="find.html#fusion.algorithms.query.metafunctions.find.complexity">Complexity</a>
</h6>
<p>
Linear, at most <tt class="computeroutput"><a href="../../../sequences/intrinsics/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">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">value</span></tt> comparisons.
</p>
<a name="fusion.algorithms.query.metafunctions.find.header"></a><h6>
<a name="id562378"></a>
<a href="find.html#fusion.algorithms.query.metafunctions.find.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">find</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"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="none.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="find_if.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>find_if</title>
<link rel="stylesheet" href="../../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
<link rel="up" href="../metafunctions.html" title="Metafunctions">
<link rel="prev" href="find.html" title="find">
<link rel="next" href="count.html" title="count">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%">
<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td>
<td align="center"><a href="../../../../../../../../index.htm">Home</a></td>
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<hr>
<div class="spirit-nav">
<a accesskey="p" href="find.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="count.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.metafunctions.find_if"></a><a href="find_if.html" title="find_if">find_if</a></h5></div></div></div>
<a name="fusion.algorithms.query.metafunctions.find_if.description"></a><h6>
<a name="id562506"></a>
<a href="find_if.html#fusion.algorithms.query.metafunctions.find_if.description">Description</a>
</h6>
<p>
Returns the result type of <tt class="computeroutput"><span class="identifier">find_if</span></tt>
given the sequence and predicate types.
</p>
<a name="fusion.algorithms.query.metafunctions.find_if.synopsis"></a><h6>
<a name="id562548"></a>
<a href="find_if.html#fusion.algorithms.query.metafunctions.find_if.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">Pred</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">find_if</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="informaltable">
<h4>
<a name="id562671"></a>
<span class="table-title">Parameters</span>
</h4>
<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">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">Pred</span></tt></td>
<td>A
model of MPL Lambda Expression</td>
<td>Operation's arguments</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.metafunctions.find_if.expression_semantics"></a><h6>
<a name="id562769"></a>
<a href="find_if.html#fusion.algorithms.query.metafunctions.find_if.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="find_if.html" title="find_if"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">find_if</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">Pred</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: A model of the same iterator
category as the iterators of <tt class="computeroutput"><span class="identifier">Sequence</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns an iterator to the
first element in <tt class="computeroutput"><span class="identifier">Sequence</span></tt>
for which <tt class="computeroutput"><span class="identifier">Pred</span></tt> evaluates
to true. Returns <tt class="computeroutput"><a href="../../../sequences/intrinsics/metafunctions/end.html" title="end"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">end</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">type</span></tt> if there is no such element.
</p>
<a name="fusion.algorithms.query.metafunctions.find_if.complexity"></a><h6>
<a name="id562967"></a>
<a href="find_if.html#fusion.algorithms.query.metafunctions.find_if.complexity">Complexity</a>
</h6>
<p>
Linear. At most <tt class="computeroutput"><a href="../../../sequences/intrinsics/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">&lt;</span><span class="identifier">Sequence</span><span class="special">&gt;::</span><span class="identifier">value</span></tt> comparisons.
</p>
<a name="fusion.algorithms.query.metafunctions.find_if.header"></a><h6>
<a name="id563050"></a>
<a href="find_if.html#fusion.algorithms.query.metafunctions.find_if.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">find_if</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"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="find.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="count.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
</body>
</html>

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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>none</title>
<link rel="stylesheet" href="../../../../boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
<link rel="start" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
<link rel="up" href="../metafunctions.html" title="Metafunctions">
<link rel="prev" href="all.html" title="all">
<link rel="next" href="find.html" title="find">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%">
<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td>
<td align="center"><a href="../../../../../../../../index.htm">Home</a></td>
<td align="center"><a href="../../../../../../../libraries.htm">Libraries</a></td>
<td align="center"><a href="../../../../../../../../people/people.htm">People</a></td>
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<div class="spirit-nav">
<a accesskey="p" href="all.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../metafunctions.html"><img src="../../../../images/up.png" alt="Up"></a><a accesskey="h" href="../../../../index.html"><img src="../../../../images/home.png" alt="Home"></a><a accesskey="n" href="find.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.query.metafunctions.none"></a><a href="none.html" title="none">none</a></h5></div></div></div>
<a name="fusion.algorithms.query.metafunctions.none.description"></a><h6>
<a name="id561219"></a>
<a href="none.html#fusion.algorithms.query.metafunctions.none.description">Description</a>
</h6>
<p>
A metafunction returning the result type of <a href="../functions/none.html" title="none"><tt class="computeroutput"><span class="identifier">none</span></tt></a>.
</p>
<a name="fusion.algorithms.query.metafunctions.none.synopsis"></a><h6>
<a name="id561268"></a>
<a href="none.html#fusion.algorithms.query.metafunctions.none.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">F</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">none</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">bool</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="informaltable">
<h4>
<a name="id561392"></a>
<span class="table-title">Parameters</span>
</h4>
<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">Sequence</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Operation's argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">F</span></tt></td>
<td>A
model of unary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a>
</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.query.metafunctions.none.expression_semantics"></a><h6>
<a name="id561499"></a>
<a href="none.html#fusion.algorithms.query.metafunctions.none.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="none.html" title="none"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">none</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">F</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">bool</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the return type of
<a href="../functions/none.html" title="none"><tt class="computeroutput"><span class="identifier">none</span></tt></a> given a sequence of type
<tt class="computeroutput"><span class="identifier">Sequence</span></tt> and a unary
<a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a> of type <tt class="computeroutput"><span class="identifier">F</span></tt>.
The return type is always <tt class="computeroutput"><span class="keyword">bool</span></tt>.
</p>
<a name="fusion.algorithms.query.metafunctions.none.complexity"></a><h6>
<a name="id561680"></a>
<a href="none.html#fusion.algorithms.query.metafunctions.none.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.query.metafunctions.none.header"></a><h6>
<a name="id561710"></a>
<a href="none.html#fusion.algorithms.query.metafunctions.none.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">none</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"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
</tr></table>
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