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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Functions</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="../iteration.html" title="Iteration">
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</table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="../iteration.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../iteration.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="functions/fold.html"><img src="../../../images/next.png" alt="Next"></a>
</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.algorithms.iteration.functions"></a><a href="functions.html" title="Functions">Functions</a></h4></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="functions/fold.html">fold</a></span></dt>
<dt><span class="section"><a href="functions/accumulate.html">accumulate</a></span></dt>
<dt><span class="section"><a href="functions/for_each.html">for_each</a></span></dt>
</dl></div>
</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="../iteration.html"><img src="../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../iteration.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="functions/fold.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>accumulate</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="../functions.html" title="Functions">
<link rel="prev" href="fold.html" title="fold">
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</head>
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<table cellpadding="2" width="100%">
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<hr>
<div class="spirit-nav">
<a accesskey="p" href="fold.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.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="for_each.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.iteration.functions.accumulate"></a><a href="accumulate.html" title="accumulate">accumulate</a></h5></div></div></div>
<a name="fusion.algorithms.iteration.functions.accumulate.description"></a><h6>
<a name="id547625"></a>
<a href="accumulate.html#fusion.algorithms.iteration.functions.accumulate.description">Description</a>
</h6>
<p>
Repeatedly applies binary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a><EFBFBD><tt class="computeroutput"><span class="identifier">f</span></tt>
to each element of a sequence and the previous state. <a href="accumulate.html" title="accumulate"><tt class="computeroutput"><span class="identifier">accumulate</span></tt></a> is equivalent to
<a href="fold.html" title="fold"><tt class="computeroutput"><span class="identifier">fold</span></tt></a>.
</p>
<a name="fusion.algorithms.iteration.functions.accumulate.synopsis"></a><h6>
<a name="id547710"></a>
<a href="accumulate.html#fusion.algorithms.iteration.functions.accumulate.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">State</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/accumulate.html" title="accumulate"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">accumulate</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">accumulate</span><span class="special">(</span>
<span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">State</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">initial_state</span><span class="special">,</span> <span class="identifier">F</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<div class="informaltable">
<h4>
<a name="id547974"></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">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>, <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">eN</span><EFBFBD><span class="special">....</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e2</span><span class="special">,</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e1</span><span class="special">,</span><span class="identifier">initial_state</span><span class="special">)))</span></tt> must be a valid expression for
each element <tt class="computeroutput"><span class="identifier">e1</span></tt>
to <tt class="computeroutput"><span class="identifier">eN</span></tt> in <tt class="computeroutput"><span class="identifier">seq</span></tt>
</td>
<td>Operation's
argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">initial_state</span></tt></td>
<td>Any
type</td>
<td>Initial state</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">f</span></tt></td>
<td>A
model of binary <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.iteration.functions.accumulate.expression_semantics"></a><h6>
<a name="id548210"></a>
<a href="accumulate.html#fusion.algorithms.iteration.functions.accumulate.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">accumulate</span><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">initial_state</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Any type
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Equivalent to <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">eN</span><EFBFBD><span class="special">....</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e2</span><span class="special">,</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e1</span><span class="special">,</span><span class="identifier">initial_state</span><span class="special">)))</span></tt>
where <tt class="computeroutput"><span class="identifier">e1</span><EFBFBD><span class="special">...</span><span class="identifier">eN</span></tt> are the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.iteration.functions.accumulate.complexity"></a><h6>
<a name="id548415"></a>
<a href="accumulate.html#fusion.algorithms.iteration.functions.accumulate.complexity">Complexity</a>
</h6>
<p>
Linear, exactly <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> applications of <tt class="computeroutput"><span class="identifier">f</span></tt>.
</p>
<a name="fusion.algorithms.iteration.functions.accumulate.header"></a><h6>
<a name="id548508"></a>
<a href="accumulate.html#fusion.algorithms.iteration.functions.accumulate.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">iteration</span><span class="special">/</span><span class="identifier">accumulate</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.iteration.functions.accumulate.example"></a><h6>
<a name="id548614"></a>
<a href="accumulate.html#fusion.algorithms.iteration.functions.accumulate.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">struct</span> <span class="identifier">make_string</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">State</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">T</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&amp;</span> <span class="identifier">str</span><span class="special">)</span> <span class="keyword">const</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">str</span> <span class="special">+</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">lexical_cast</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&gt;(</span><span class="identifier">t</span><span class="special">);</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="special">...</span>
<span class="keyword">const</span> <a href="../../../sequences/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">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="accumulate.html" title="accumulate"><tt class="computeroutput"><span class="identifier">accumulate</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="string">""</span><span class="special">),</span> <span class="identifier">make_string</span><span class="special">())</span> <span class="special">==</span> <span class="string">"12"</span><span class="special">);</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="fold.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.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="for_each.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>fold</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="../functions.html" title="Functions">
<link rel="prev" href="../functions.html" title="Functions">
<link rel="next" href="accumulate.html" title="accumulate">
</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>
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<td align="center"><a href="../../../../../../../../people/people.htm">People</a></td>
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<td align="center"><a href="../../../../../../../../more/index.htm">More</a></td>
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<div class="spirit-nav">
<a accesskey="p" href="../functions.html"><img src="../../../../images/prev.png" alt="Prev"></a><a accesskey="u" href="../functions.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="accumulate.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.iteration.functions.fold"></a><a href="fold.html" title="fold">fold</a></h5></div></div></div>
<a name="fusion.algorithms.iteration.functions.fold.description"></a><h6>
<a name="id546162"></a>
<a href="fold.html#fusion.algorithms.iteration.functions.fold.description">Description</a>
</h6>
<p>
Repeatedly applies binary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a><EFBFBD><tt class="computeroutput"><span class="identifier">f</span></tt>
to each element of a sequence and the previous state.
</p>
<a name="fusion.algorithms.iteration.functions.fold.synopsis"></a><h6>
<a name="id546212"></a>
<a href="fold.html#fusion.algorithms.iteration.functions.fold.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">State</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">F</span>
<span class="special">&gt;</span>
<span class="keyword">typename</span> <a href="../metafunctions/fold.html" title="fold"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">fold</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">State</span><span class="special">,</span> <span class="identifier">F</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">fold</span><span class="special">(</span>
<span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">State</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">initial_state</span><span class="special">,</span> <span class="identifier">F</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<div class="informaltable">
<h4>
<a name="id546474"></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">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>,<tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt> must be a valid expression for
each element <tt class="computeroutput"><span class="identifier">e</span></tt>
in <tt class="computeroutput"><span class="identifier">seq</span></tt>
</td>
<td>Operation's
argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">initial_state</span></tt></td>
<td>Any
type</td>
<td>Initial state</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">f</span></tt></td>
<td>A
model of binary <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.iteration.functions.fold.expression_semantics"></a><h6>
<a name="id546647"></a>
<a href="fold.html#fusion.algorithms.iteration.functions.fold.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">fold</span><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">initial_state</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: Any type
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Equivalent to <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">eN</span><EFBFBD><span class="special">....</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e2</span><span class="special">,</span><span class="identifier">f</span><span class="special">(</span><span class="identifier">e1</span><span class="special">,</span><span class="identifier">initial_state</span><span class="special">)))</span></tt>
where <tt class="computeroutput"><span class="identifier">e1</span><EFBFBD><span class="special">...</span><span class="identifier">eN</span></tt> are the elements of <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.iteration.functions.fold.complexity"></a><h6>
<a name="id546852"></a>
<a href="fold.html#fusion.algorithms.iteration.functions.fold.complexity">Complexity</a>
</h6>
<p>
Linear, exactly <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> applications of <tt class="computeroutput"><span class="identifier">f</span></tt>.
</p>
<a name="fusion.algorithms.iteration.functions.fold.header"></a><h6>
<a name="id546944"></a>
<a href="fold.html#fusion.algorithms.iteration.functions.fold.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">iteration</span><span class="special">/</span><span class="identifier">fold</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.iteration.functions.fold.example"></a><h6>
<a name="id547050"></a>
<a href="fold.html#fusion.algorithms.iteration.functions.fold.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">struct</span> <span class="identifier">make_string</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">State</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">apply</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">operator</span><span class="special">()(</span><span class="keyword">const</span> <span class="identifier">T</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&amp;</span> <span class="identifier">str</span><span class="special">)</span> <span class="keyword">const</span>
<span class="special">{</span>
<span class="keyword">return</span> <span class="identifier">str</span> <span class="special">+</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">lexical_cast</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&gt;(</span><span class="identifier">t</span><span class="special">);</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="special">...</span>
<span class="keyword">const</span> <a href="../../../sequences/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">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="fold.html" title="fold"><tt class="computeroutput"><span class="identifier">fold</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">,</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="string">""</span><span class="special">),</span> <span class="identifier">make_string</span><span class="special">())</span> <span class="special">==</span> <span class="string">"12"</span><span class="special">);</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>
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<head>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.iteration.functions.for_each"></a><a href="for_each.html" title="for_each">for_each</a></h5></div></div></div>
<a name="fusion.algorithms.iteration.functions.for_each.description"></a><h6>
<a name="id549187"></a>
<a href="for_each.html#fusion.algorithms.iteration.functions.for_each.description">Description</a>
</h6>
<p>
Applies a unary function object to each element of a sequence.
</p>
<a name="fusion.algorithms.iteration.functions.for_each.synopsis"></a><h6>
<a name="id549219"></a>
<a href="for_each.html#fusion.algorithms.iteration.functions.for_each.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">typename</span> <a href="../metafunctions/for_each.html" title="for_each"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">for_each</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> <span class="identifier">for_each</span><span class="special">(</span>
<span class="identifier">Sequence</span><span class="special">&amp;</span> <span class="identifier">seq</span><span class="special">,</span> <span class="identifier">F</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<div class="informaltable">
<h4>
<a name="id549424"></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">seq</span></tt></td>
<td>A
model of <a href="../../../sequences/concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>, <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt> must be a valid expression for
each element <tt class="computeroutput"><span class="identifier">e</span></tt>
in <tt class="computeroutput"><span class="identifier">seq</span></tt>
</td>
<td>Operation's
argument</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">f</span></tt></td>
<td>A
unary function object</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.iteration.functions.for_each.expression_semantics"></a><h6>
<a name="id549568"></a>
<a href="for_each.html#fusion.algorithms.iteration.functions.for_each.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="for_each.html" title="for_each"><tt class="computeroutput"><span class="identifier">for_each</span></tt></a><span class="special">(</span><span class="identifier">seq</span><span class="special">,</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><span class="keyword">void</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Calls <tt class="computeroutput"><span class="identifier">f</span><span class="special">(</span><span class="identifier">e</span><span class="special">)</span></tt> for each element <tt class="computeroutput"><span class="identifier">e</span></tt>
in <tt class="computeroutput"><span class="identifier">seq</span></tt>.
</p>
<a name="fusion.algorithms.iteration.functions.for_each.complexity"></a><h6>
<a name="id549720"></a>
<a href="for_each.html#fusion.algorithms.iteration.functions.for_each.complexity">Complexity</a>
</h6>
<p>
Linear, exactly <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> applications of <tt class="computeroutput"><span class="identifier">f</span></tt>.
</p>
<a name="fusion.algorithms.iteration.functions.for_each.header"></a><h6>
<a name="id549812"></a>
<a href="for_each.html#fusion.algorithms.iteration.functions.for_each.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">iteration</span><span class="special">/</span><span class="identifier">for_each</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.algorithms.iteration.functions.for_each.example"></a><h6>
<a name="id549918"></a>
<a href="for_each.html#fusion.algorithms.iteration.functions.for_each.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">struct</span> <span class="identifier">increment</span>
<span class="special">{</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">T</span><span class="special">&gt;</span>
<span class="keyword">void</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">T</span><span class="special">&amp;</span> <span class="identifier">t</span><span class="special">)</span> <span class="keyword">const</span>
<span class="special">{</span>
<span class="special">++</span><span class="identifier">t</span><span class="special">;</span>
<span class="special">}</span>
<span class="special">};</span>
<span class="special">...</span>
<a href="../../../sequences/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">int</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="number">2</span><span class="special">);</span>
<a href="for_each.html" title="for_each"><tt class="computeroutput"><span class="identifier">for_each</span></tt></a><span class="special">(</span><span class="identifier">vec</span><span class="special">,</span> <span class="identifier">increment</span><span class="special">());</span>
<span class="identifier">assert</span><span class="special">(</span><span class="identifier">vec</span> <span class="special">==</span> <a href="../../../sequences/generation/functions/make_vector.html" title="make_vector"><tt class="computeroutput"><span class="identifier">make_vector</span></tt></a><span class="special">(</span><span class="number">2</span><span class="special">,</span><span class="number">3</span><span class="special">));</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>
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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.algorithms.iteration.metafunctions"></a><a href="metafunctions.html" title="Metafunctions">Metafunctions</a></h4></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="metafunctions/fold.html">fold</a></span></dt>
<dt><span class="section"><a href="metafunctions/accumulate.html">accumulate</a></span></dt>
<dt><span class="section"><a href="metafunctions/for_each.html">for_each</a></span></dt>
</dl></div>
</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>
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<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.iteration.metafunctions.accumulate"></a><a href="accumulate.html" title="accumulate">accumulate</a></h5></div></div></div>
<a name="fusion.algorithms.iteration.metafunctions.accumulate.description"></a><h6>
<a name="id551019"></a>
<a href="accumulate.html#fusion.algorithms.iteration.metafunctions.accumulate.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/accumulate.html" title="accumulate"><tt class="computeroutput"><span class="identifier">accumulate</span></tt></a>.
</p>
<a name="fusion.algorithms.iteration.metafunctions.accumulate.synopsis"></a><h6>
<a name="id551068"></a>
<a href="accumulate.html#fusion.algorithms.iteration.metafunctions.accumulate.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">State</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">accumulate</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="id551207"></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>The sequence to iterate</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">State</span></tt></td>
<td>Any
type</td>
<td>The initial state for the first application
of <tt class="computeroutput"><span class="identifier">F</span></tt>
</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">F</span></tt></td>
<td>A
model of binary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a>
</td>
<td>The operation to be applied
on forward traversal</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.iteration.metafunctions.accumulate.expression_semantics"></a><h6>
<a name="id551346"></a>
<a href="accumulate.html#fusion.algorithms.iteration.metafunctions.accumulate.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="accumulate.html" title="accumulate"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">accumulate</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">State</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>: Any type
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the result of applying
<tt class="computeroutput"><span class="identifier">accumulate</span></tt> to a sequence
of type <tt class="computeroutput"><span class="identifier">Sequence</span></tt>, with
an initial state of type <tt class="computeroutput"><span class="identifier">State</span></tt>
and binary <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>.
</p>
<a name="fusion.algorithms.iteration.metafunctions.accumulate.complexity"></a><h6>
<a name="id551524"></a>
<a href="accumulate.html#fusion.algorithms.iteration.metafunctions.accumulate.complexity">Complexity</a>
</h6>
<p>
Linear, exactly <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> applications of <tt class="computeroutput"><span class="identifier">F</span></tt>.
</p>
<a name="fusion.algorithms.iteration.metafunctions.accumulate.header"></a><h6>
<a name="id551617"></a>
<a href="accumulate.html#fusion.algorithms.iteration.metafunctions.accumulate.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">iteration</span><span class="special">/</span><span class="identifier">accumulate</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>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.iteration.metafunctions.fold"></a><a href="fold.html" title="fold">fold</a></h5></div></div></div>
<a name="fusion.algorithms.iteration.metafunctions.fold.description"></a><h6>
<a name="id550300"></a>
<a href="fold.html#fusion.algorithms.iteration.metafunctions.fold.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/fold.html" title="fold"><tt class="computeroutput"><span class="identifier">fold</span></tt></a>.
</p>
<a name="fusion.algorithms.iteration.metafunctions.fold.synopsis"></a><h6>
<a name="id550348"></a>
<a href="fold.html#fusion.algorithms.iteration.metafunctions.fold.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">State</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">fold</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="id550486"></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>The sequence to iterate</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">State</span></tt></td>
<td>Any
type</td>
<td>The initial state for the first application
of <tt class="computeroutput"><span class="identifier">F</span></tt>
</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">F</span></tt></td>
<td>A
model of binary <a href="../../concepts/polymorphic_function_object.html" title="Polymorphic
Function Object">Polymorphic
Function Object</a>
</td>
<td>The operation to be applied
on forward traversal</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.iteration.metafunctions.fold.expression_semantics"></a><h6>
<a name="id550624"></a>
<a href="fold.html#fusion.algorithms.iteration.metafunctions.fold.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="fold.html" title="fold"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">fold</span></tt></a><span class="special">&lt;</span><span class="identifier">Sequence</span><span class="special">,</span> <span class="identifier">State</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>: Any type
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the result of applying
<tt class="computeroutput"><span class="identifier">fold</span></tt> to a sequence of
type <tt class="computeroutput"><span class="identifier">Sequence</span></tt>, with an
initial state of type <tt class="computeroutput"><span class="identifier">State</span></tt>
and binary <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>.
</p>
<a name="fusion.algorithms.iteration.metafunctions.fold.complexity"></a><h6>
<a name="id550802"></a>
<a href="fold.html#fusion.algorithms.iteration.metafunctions.fold.complexity">Complexity</a>
</h6>
<p>
Linear, exactly <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> applications of <tt class="computeroutput"><span class="identifier">F</span></tt>.
</p>
<a name="fusion.algorithms.iteration.metafunctions.fold.header"></a><h6>
<a name="id550893"></a>
<a href="fold.html#fusion.algorithms.iteration.metafunctions.fold.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">iteration</span><span class="special">/</span><span class="identifier">fold</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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<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.algorithms.iteration.metafunctions.for_each"></a><a href="for_each.html" title="for_each">for_each</a></h5></div></div></div>
<p>
A metafunction returning the result type of applying <a href="../functions/for_each.html" title="for_each"><tt class="computeroutput"><span class="identifier">for_each</span></tt></a> to a sequence. The
return type of <a href="../functions/for_each.html" title="for_each"><tt class="computeroutput"><span class="identifier">for_each</span></tt></a> is always <tt class="computeroutput"><span class="keyword">void</span></tt>.
</p>
<a name="fusion.algorithms.iteration.metafunctions.for_each.description"></a><h6>
<a name="id551793"></a>
<a href="for_each.html#fusion.algorithms.iteration.metafunctions.for_each.description">Description</a>
</h6>
<a name="fusion.algorithms.iteration.metafunctions.for_each.synopsis"></a><h6>
<a name="id551820"></a>
<a href="for_each.html#fusion.algorithms.iteration.metafunctions.for_each.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">for_each</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">void</span> <span class="identifier">type</span><span class="special">;</span>
<span class="special">};</span>
</pre>
<div class="informaltable">
<h4>
<a name="id551946"></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>Any
type</td>
<td>Operation's argument</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.algorithms.iteration.metafunctions.for_each.expression_semantics"></a><h6>
<a name="id552046"></a>
<a href="for_each.html#fusion.algorithms.iteration.metafunctions.for_each.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<a href="for_each.html" title="for_each"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">for_each</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">void</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the return type of
<a href="../functions/for_each.html" title="for_each"><tt class="computeroutput"><span class="identifier">for_each</span></tt></a> for a sequence of type
<tt class="computeroutput"><span class="identifier">Sequence</span></tt> and a unary
function object <tt class="computeroutput"><span class="identifier">F</span></tt>. The
return type is always <tt class="computeroutput"><span class="keyword">void</span></tt>.
</p>
<a name="fusion.algorithms.iteration.metafunctions.for_each.complexity"></a><h6>
<a name="id552219"></a>
<a href="for_each.html#fusion.algorithms.iteration.metafunctions.for_each.complexity">Complexity</a>
</h6>
<p>
Constant.
</p>
<a name="fusion.algorithms.iteration.metafunctions.for_each.header"></a><h6>
<a name="id552250"></a>
<a href="for_each.html#fusion.algorithms.iteration.metafunctions.for_each.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">iteration</span><span class="special">/</span><span class="identifier">for_each</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>
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<a accesskey="p" href="accumulate.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="../../query.html"><img src="../../../../images/next.png" alt="Next"></a>
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