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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>at</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="size.html" title="size">
<link rel="next" href="at_c.html" title="at_c">
</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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<td align="center"><a href="../../../../../../../../more/index.htm">More</a></td>
</table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="size.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="at_c.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.sequences.intrinsics.metafunctions.at"></a><a href="at.html" title="at">at</a></h5></div></div></div>
<a name="fusion.sequences.intrinsics.metafunctions.at.description"></a><h6>
<a name="id511129"></a>
<a href="at.html#fusion.sequences.intrinsics.metafunctions.at.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a>
<sup>[<a name="id511166" href="#ftn.id511166">6</a>]</sup>
.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.at.synopsis"></a><h6>
<a name="id511278"></a>
<a href="at.html#fusion.sequences.intrinsics.metafunctions.at.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">Seq</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">N</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">at</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="id511398"></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="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Argument sequence</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">N</span></tt></td>
<td>An
MPL Integral Constant</td>
<td>Index of element</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.sequences.intrinsics.metafunctions.at.expression_semantics"></a><h6>
<a name="id511498"></a>
<a href="at.html#fusion.sequences.intrinsics.metafunctions.at.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">,</span> <span class="identifier">N</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 type of
using <a href="../functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a> to access the <tt class="computeroutput"><span class="identifier">N</span></tt>th element of <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.at.header"></a><h6>
<a name="id511637"></a>
<a href="at.html#fusion.sequences.intrinsics.metafunctions.at.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">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">at</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequences.intrinsics.metafunctions.at.example"></a><h6>
<a name="id511742"></a>
<a href="at.html#fusion.sequences.intrinsics.metafunctions.at.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../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">float</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="at.html" title="at"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">int_</span><span class="special">&lt;</span><span class="number">1</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">float</span><span class="special">&amp;&gt;));</span>
</pre>
<div class="footnotes">
<br><hr width="100" align="left">
<div class="footnote"><p><sup>[<a name="ftn.id511166" href="#id511166">6</a>] </sup>
<a href="at.html" title="at"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at</span></tt></a> reflects the actual return
type of the function <a href="../functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a>. <span class="underline">_sequence</span>_s
typically return references to its elements via the <a href="../functions/at.html" title="at"><tt class="computeroutput"><span class="identifier">at</span></tt></a> function. If you want
to get the actual element type, use <a href="value_at.html" title="value_at"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at</span></tt></a>
</p></div>
</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="size.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="at_c.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>at_c</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="at.html" title="at">
<link rel="next" href="value_at.html" title="value_at">
</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="at.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="value_at.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.sequences.intrinsics.metafunctions.at_c"></a><a href="at_c.html" title="at_c">at_c</a></h5></div></div></div>
<a name="fusion.sequences.intrinsics.metafunctions.at_c.description"></a><h6>
<a name="id512004"></a>
<a href="at_c.html#fusion.sequences.intrinsics.metafunctions.at_c.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/at_c.html" title="at_c"><tt class="computeroutput"><span class="identifier">at_c</span></tt></a>
<sup>[<a name="id512042" href="#ftn.id512042">7</a>]</sup>
.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.at_c.synopsis"></a><h6>
<a name="id512155"></a>
<a href="at_c.html#fusion.sequences.intrinsics.metafunctions.at_c.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">Seq</span><span class="special">,</span>
<span class="keyword">int</span> <span class="identifier">M</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">at_c</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="id512276"></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="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Argument sequence</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">M</span></tt></td>
<td>Positive
integer index</td>
<td>Index of element</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.sequences.intrinsics.metafunctions.at_c.expression_semantics"></a><h6>
<a name="id512375"></a>
<a href="at_c.html#fusion.sequences.intrinsics.metafunctions.at_c.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_c</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">,</span> <span class="identifier">M</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 type of
using <a href="../functions/at_c.html" title="at_c"><tt class="computeroutput"><span class="identifier">at_c</span></tt></a> to access the <tt class="computeroutput"><span class="identifier">M</span></tt>th element of <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.at_c.header"></a><h6>
<a name="id512515"></a>
<a href="at_c.html#fusion.sequences.intrinsics.metafunctions.at_c.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">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">at</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequences.intrinsics.metafunctions.at_c.example"></a><h6>
<a name="id512620"></a>
<a href="at_c.html#fusion.sequences.intrinsics.metafunctions.at_c.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../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">float</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="at_c.html" title="at_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_c</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">,</span> <span class="number">1</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">float</span><span class="special">&amp;&gt;));</span>
</pre>
<div class="footnotes">
<br><hr width="100" align="left">
<div class="footnote"><p><sup>[<a name="ftn.id512042" href="#id512042">7</a>] </sup>
<a href="at_c.html" title="at_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_c</span></tt></a> reflects the actual
return type of the function <a href="../functions/at_c.html" title="at_c"><tt class="computeroutput"><span class="identifier">at_c</span></tt></a>. <span class="underline">_sequence</span>_s
typically return references to its elements via the <a href="../functions/at_c.html" title="at_c"><tt class="computeroutput"><span class="identifier">at_c</span></tt></a> function. If you want
to get the actual element type, use <a href="value_at_c.html" title="value_at_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at_c</span></tt></a>
</p></div>
</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="at.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="value_at.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
</body>
</html>

136
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@ -0,0 +1,136 @@
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>at_key</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="has_key.html" title="has_key">
<link rel="next" href="value_at_key.html" title="value_at_key">
</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="has_key.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="value_at_key.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.sequences.intrinsics.metafunctions.at_key"></a><a href="at_key.html" title="at_key">at_key</a></h5></div></div></div>
<a name="fusion.sequences.intrinsics.metafunctions.at_key.description"></a><h6>
<a name="id515198"></a>
<a href="at_key.html#fusion.sequences.intrinsics.metafunctions.at_key.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">at_key</span></tt></a>
<sup>[<a name="id515236" href="#ftn.id515236">8</a>]</sup>
.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.at_key.synopsis"></a><h6>
<a name="id515347"></a>
<a href="at_key.html#fusion.sequences.intrinsics.metafunctions.at_key.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">Seq</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Key</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">at_key</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="id515468"></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="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Argument sequence</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">Key</span></tt></td>
<td>Any
type</td>
<td>Key type</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.sequences.intrinsics.metafunctions.at_key.expression_semantics"></a><h6>
<a name="id515568"></a>
<a href="at_key.html#fusion.sequences.intrinsics.metafunctions.at_key.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_key</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">,</span> <span class="identifier">Key</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 using
<a href="../functions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">at_key</span></tt></a> to access the element
with key type <tt class="computeroutput"><span class="identifier">Key</span></tt> in
<tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.at_key.header"></a><h6>
<a name="id515709"></a>
<a href="at_key.html#fusion.sequences.intrinsics.metafunctions.at_key.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">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">at_key</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequences.intrinsics.metafunctions.at_key.example"></a><h6>
<a name="id515814"></a>
<a href="at_key.html#fusion.sequences.intrinsics.metafunctions.at_key.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../containers/map.html" title="map"><tt class="computeroutput"><span class="identifier">map</span></tt></a><span class="special">&lt;</span><a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;,</span> <a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;,</span> <a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special">&lt;</span><span class="keyword">double</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">mymap</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_key</span></tt></a><span class="special">&lt;</span><span class="identifier">mymap</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&amp;&gt;));</span>
</pre>
<div class="footnotes">
<br><hr width="100" align="left">
<div class="footnote"><p><sup>[<a name="ftn.id515236" href="#id515236">8</a>] </sup>
<a href="at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_key</span></tt></a> reflects the actual
return type of the function <a href="../functions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">at_key</span></tt></a>. <span class="underline">_sequence</span>_s
typically return references to its elements via the <a href="../functions/at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">at_key</span></tt></a> function. If you
want to get the actual element type, use <a href="value_at_key.html" title="value_at_key"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at_key</span></tt></a>
</p></div>
</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="has_key.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="value_at_key.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>back</title>
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<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="front.html" title="front">
<link rel="next" href="size.html" title="size">
</head>
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<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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<div class="spirit-nav">
<a accesskey="p" href="front.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="size.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.sequences.intrinsics.metafunctions.back"></a><a href="back.html" title="back">back</a></h5></div></div></div>
<a name="fusion.sequences.intrinsics.metafunctions.back.description"></a><h6>
<a name="id509701"></a>
<a href="back.html#fusion.sequences.intrinsics.metafunctions.back.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/back.html" title="back"><tt class="computeroutput"><span class="identifier">back</span></tt></a>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.back.synopsis"></a><h6>
<a name="id509749"></a>
<a href="back.html#fusion.sequences.intrinsics.metafunctions.back.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">Seq</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">back</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="id509850"></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="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Argument sequence</td>
</tr></tbody>
</table>
</div>
<a name="fusion.sequences.intrinsics.metafunctions.back.expression_semantics"></a><h6>
<a name="id509928"></a>
<a href="back.html#fusion.sequences.intrinsics.metafunctions.back.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">back</span><span class="special">&lt;</span><span class="identifier">Seq</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>: The type returned by dereferencing
an iterator to the last element in the sequence. Equivalent to <tt class="computeroutput"><a href="../../../iterators/metafunctions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span></tt></a><span class="special">&lt;</span><a href="../../../iterators/metafunctions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">prior</span></tt></a><span class="special">&lt;</span><a href="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">Seq</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.back.header"></a><h6>
<a name="id510152"></a>
<a href="back.html#fusion.sequences.intrinsics.metafunctions.back.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">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">back</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequences.intrinsics.metafunctions.back.example"></a><h6>
<a name="id510257"></a>
<a href="back.html#fusion.sequences.intrinsics.metafunctions.back.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../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">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="back.html" title="back"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">back</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&amp;&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="front.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="size.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>begin</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">
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</head>
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<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="end.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.sequences.intrinsics.metafunctions.begin"></a><a href="begin.html" title="begin">begin</a></h5></div></div></div>
<a name="fusion.sequences.intrinsics.metafunctions.begin.description"></a><h6>
<a name="id506777"></a>
<a href="begin.html#fusion.sequences.intrinsics.metafunctions.begin.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.begin.synopsis"></a><h6>
<a name="id506825"></a>
<a href="begin.html#fusion.sequences.intrinsics.metafunctions.begin.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">Seq</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">begin</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="id506928"></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="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Argument sequence</td>
</tr></tbody>
</table>
</div>
<a name="fusion.sequences.intrinsics.metafunctions.begin.expression_semantics"></a><h6>
<a name="id507006"></a>
<a href="begin.html#fusion.sequences.intrinsics.metafunctions.begin.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: An iterator modelling the
same traversal concept as <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the type of an iterator
to the first element of <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.begin.header"></a><h6>
<a name="id507118"></a>
<a href="begin.html#fusion.sequences.intrinsics.metafunctions.begin.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">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">begin</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequences.intrinsics.metafunctions.begin.example"></a><h6>
<a name="id507224"></a>
<a href="begin.html#fusion.sequences.intrinsics.metafunctions.begin.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../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">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="begin.html" title="begin"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">it</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="../../../iterators/metafunctions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span></tt></a><span class="special">&lt;</span><span class="identifier">it</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&amp;&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="end.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
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</html>

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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>empty</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="end.html" title="end">
<link rel="next" href="front.html" title="front">
</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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<td align="center"><a href="../../../../../../../../more/index.htm">More</a></td>
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<hr>
<div class="spirit-nav">
<a accesskey="p" href="end.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="front.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.sequences.intrinsics.metafunctions.empty"></a><a href="empty.html" title="empty">empty</a></h5></div></div></div>
<a name="fusion.sequences.intrinsics.metafunctions.empty.description"></a><h6>
<a name="id508232"></a>
<a href="empty.html#fusion.sequences.intrinsics.metafunctions.empty.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/empty.html" title="empty"><tt class="computeroutput"><span class="identifier">empty</span></tt></a>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.empty.synopsis"></a><h6>
<a name="id508279"></a>
<a href="empty.html#fusion.sequences.intrinsics.metafunctions.empty.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">Seq</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">empty</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="id508382"></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="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Argument sequence</td>
</tr></tbody>
</table>
</div>
<a name="fusion.sequences.intrinsics.metafunctions.empty.expression_semantics"></a><h6>
<a name="id508460"></a>
<a href="empty.html#fusion.sequences.intrinsics.metafunctions.empty.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">empty</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: An MPL Integral Constant
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns <tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt>
if <tt class="computeroutput"><span class="identifier">Seq</span></tt> has zero elements,
<tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></tt> otherwise.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.empty.header"></a><h6>
<a name="id508603"></a>
<a href="empty.html#fusion.sequences.intrinsics.metafunctions.empty.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">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">empty</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequences.intrinsics.metafunctions.empty.example"></a><h6>
<a name="id508708"></a>
<a href="empty.html#fusion.sequences.intrinsics.metafunctions.empty.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../containers/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special">&lt;&gt;</span> <span class="identifier">empty_vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../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">float</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><a href="empty.html" title="empty"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">empty</span></tt></a><span class="special">&lt;</span><span class="identifier">empty_vec</span><span class="special">&gt;));</span>
<span class="identifier">BOOST_MPL_ASSERT_NOT</span><span class="special">((</span><a href="empty.html" title="empty"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">empty</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</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="end.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="front.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>end</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="begin.html" title="begin">
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<a accesskey="p" href="begin.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="empty.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.sequences.intrinsics.metafunctions.end"></a><a href="end.html" title="end">end</a></h5></div></div></div>
<a name="fusion.sequences.intrinsics.metafunctions.end.description"></a><h6>
<a name="id507481"></a>
<a href="end.html#fusion.sequences.intrinsics.metafunctions.end.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/end.html" title="end"><tt class="computeroutput"><span class="identifier">end</span></tt></a>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.end.synopsis"></a><h6>
<a name="id507528"></a>
<a href="end.html#fusion.sequences.intrinsics.metafunctions.end.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">Seq</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">end</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="id507629"></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="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Argument sequence</td>
</tr></tbody>
</table>
</div>
<a name="fusion.sequences.intrinsics.metafunctions.end.expression_semantics"></a><h6>
<a name="id507708"></a>
<a href="end.html#fusion.sequences.intrinsics.metafunctions.end.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">end</span><span class="special">&lt;</span><span class="identifier">Seq</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 traversal
concept as <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the type of an iterator
one past the end of <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.end.header"></a><h6>
<a name="id507819"></a>
<a href="end.html#fusion.sequences.intrinsics.metafunctions.end.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">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">end</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequences.intrinsics.metafunctions.end.example"></a><h6>
<a name="id507923"></a>
<a href="end.html#fusion.sequences.intrinsics.metafunctions.end.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../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">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../../iterators/metafunctions/prior.html" title="prior"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">prior</span></tt></a><span class="special">&lt;</span><a href="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">vec</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">first</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><a href="../../../iterators/metafunctions/equal_to.html" title="equal_to"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">equal_to</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">,</span> <a href="begin.html" title="begin"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">&gt;::</span><span class="identifier">type</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="begin.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="empty.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>front</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="empty.html" title="empty">
<link rel="next" href="back.html" title="back">
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<div class="spirit-nav">
<a accesskey="p" href="empty.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="back.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.sequences.intrinsics.metafunctions.front"></a><a href="front.html" title="front">front</a></h5></div></div></div>
<a name="fusion.sequences.intrinsics.metafunctions.front.description"></a><h6>
<a name="id508971"></a>
<a href="front.html#fusion.sequences.intrinsics.metafunctions.front.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/front.html" title="front"><tt class="computeroutput"><span class="identifier">front</span></tt></a>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.front.synopsis"></a><h6>
<a name="id509019"></a>
<a href="front.html#fusion.sequences.intrinsics.metafunctions.front.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">Seq</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">front</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="id509122"></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="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Argument sequence</td>
</tr></tbody>
</table>
</div>
<a name="fusion.sequences.intrinsics.metafunctions.front.expression_semantics"></a><h6>
<a name="id509199"></a>
<a href="front.html#fusion.sequences.intrinsics.metafunctions.front.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">front</span><span class="special">&lt;</span><span class="identifier">Seq</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>: The type returned by dereferencing
an iterator to the first element in <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
Equivalent to <tt class="computeroutput"><a href="../../../iterators/metafunctions/deref.html" title="deref"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">deref</span></tt></a><span class="special">&lt;</span><a href="begin.html" title="begin"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span></tt></a><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.front.header"></a><h6>
<a name="id509393"></a>
<a href="front.html#fusion.sequences.intrinsics.metafunctions.front.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">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">front</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequences.intrinsics.metafunctions.front.example"></a><h6>
<a name="id509498"></a>
<a href="front.html#fusion.sequences.intrinsics.metafunctions.front.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../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">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="front.html" title="front"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">front</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&amp;&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="empty.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="back.html"><img src="../../../../images/next.png" alt="Next"></a>
</div>
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>has_key</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">
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<link rel="next" href="at_key.html" title="at_key">
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<hr>
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<a accesskey="p" href="value_at_c.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="at_key.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.sequences.intrinsics.metafunctions.has_key"></a><a href="has_key.html" title="has_key">has_key</a></h5></div></div></div>
<a name="fusion.sequences.intrinsics.metafunctions.has_key.description"></a><h6>
<a name="id514315"></a>
<a href="has_key.html#fusion.sequences.intrinsics.metafunctions.has_key.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/has_key.html" title="has_key"><tt class="computeroutput"><span class="identifier">has_key</span></tt></a>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.has_key.synopsis"></a><h6>
<a name="id514362"></a>
<a href="has_key.html#fusion.sequences.intrinsics.metafunctions.has_key.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">Seq</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Key</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">has_key</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="id514483"></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="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Argument sequence</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">Key</span></tt></td>
<td>Any
type</td>
<td>Key type</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.sequences.intrinsics.metafunctions.has_key.expression_semantics"></a><h6>
<a name="id514581"></a>
<a href="has_key.html#fusion.sequences.intrinsics.metafunctions.has_key.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">has_key</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">,</span> <span class="identifier">Key</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: An MPL Integral Constant.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns <tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">true_</span></tt>
if <tt class="computeroutput"><span class="identifier">Seq</span></tt> contains an element
with key type <tt class="computeroutput"><span class="identifier">Key</span></tt>, returns
<tt class="computeroutput"><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">false_</span></tt> otherwise.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.has_key.header"></a><h6>
<a name="id514745"></a>
<a href="has_key.html#fusion.sequences.intrinsics.metafunctions.has_key.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">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">has_key</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequences.intrinsics.metafunctions.has_key.example"></a><h6>
<a name="id514850"></a>
<a href="has_key.html#fusion.sequences.intrinsics.metafunctions.has_key.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../containers/map.html" title="map"><tt class="computeroutput"><span class="identifier">map</span></tt></a><span class="special">&lt;</span><a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;,</span> <a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;,</span> <a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special">&lt;</span><span class="keyword">double</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">mymap</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><a href="has_key.html" title="has_key"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">has_key</span></tt></a><span class="special">&lt;</span><span class="identifier">mymap</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;));</span>
<span class="identifier">BOOST_MPL_ASSERT_NOT</span><span class="special">((</span><a href="has_key.html" title="has_key"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">has_key</span></tt></a><span class="special">&lt;</span><span class="identifier">mymap</span><span class="special">,</span> <span class="keyword">void</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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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>size</title>
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<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>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequences.intrinsics.metafunctions.size"></a><a href="size.html" title="size">size</a></h5></div></div></div>
<a name="fusion.sequences.intrinsics.metafunctions.size.description"></a><h6>
<a name="id510460"></a>
<a href="size.html#fusion.sequences.intrinsics.metafunctions.size.description">Description</a>
</h6>
<p>
Returns the result type of <a href="../functions/size.html" title="size"><tt class="computeroutput"><span class="identifier">size</span></tt></a>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.size.synopsis"></a><h6>
<a name="id510508"></a>
<a href="size.html#fusion.sequences.intrinsics.metafunctions.size.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">Seq</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">size</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="id510610"></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="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Argument sequence</td>
</tr></tbody>
</table>
</div>
<a name="fusion.sequences.intrinsics.metafunctions.size.expression_semantics"></a><h6>
<a name="id510687"></a>
<a href="size.html#fusion.sequences.intrinsics.metafunctions.size.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">size</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">&gt;::</span><span class="identifier">type</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: An MPL Integral Constant.
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Returns the number of elements
in <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.size.header"></a><h6>
<a name="id510790"></a>
<a href="size.html#fusion.sequences.intrinsics.metafunctions.size.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">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">size</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequences.intrinsics.metafunctions.size.example"></a><h6>
<a name="id510895"></a>
<a href="size.html#fusion.sequences.intrinsics.metafunctions.size.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../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">float</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="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">vec</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">size_mpl_integral_constant</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT_RELATION</span><span class="special">(</span><span class="identifier">size_mpl_integral_constant</span><span class="special">::</span><span class="identifier">value</span><span class="special">,</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>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="back.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="at.html"><img src="../../../../images/next.png" alt="Next"></a>
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<html>
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<title>value_at</title>
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<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequences.intrinsics.metafunctions.value_at"></a><a href="value_at.html" title="value_at">value_at</a></h5></div></div></div>
<a name="fusion.sequences.intrinsics.metafunctions.value_at.description"></a><h6>
<a name="id512846"></a>
<a href="value_at.html#fusion.sequences.intrinsics.metafunctions.value_at.description">Description</a>
</h6>
<p>
Returns the actual type at a given index from the <a href="../../../sequences.html" title="Sequences">Sequence</a>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.value_at.synopsis"></a><h6>
<a name="id512886"></a>
<a href="value_at.html#fusion.sequences.intrinsics.metafunctions.value_at.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">Seq</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">N</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">value_at</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="id513007"></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="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Argument sequence</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">N</span></tt></td>
<td>An
MPL Integral Constant</td>
<td>Index of element</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.sequences.intrinsics.metafunctions.value_at.expression_semantics"></a><h6>
<a name="id513105"></a>
<a href="value_at.html#fusion.sequences.intrinsics.metafunctions.value_at.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">,</span> <span class="identifier">N</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 actual type at
the <tt class="computeroutput"><span class="identifier">N</span></tt>th element of <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.value_at.header"></a><h6>
<a name="id513228"></a>
<a href="value_at.html#fusion.sequences.intrinsics.metafunctions.value_at.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">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">value_at</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequences.intrinsics.metafunctions.value_at.example"></a><h6>
<a name="id513334"></a>
<a href="value_at.html#fusion.sequences.intrinsics.metafunctions.value_at.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../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">float</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="value_at.html" title="value_at"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">mpl</span><span class="special">::</span><span class="identifier">int_</span><span class="special">&lt;</span><span class="number">1</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">float</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="at_c.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="value_at_c.html"><img src="../../../../images/next.png" alt="Next"></a>
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<title>value_at_c</title>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequences.intrinsics.metafunctions.value_at_c"></a><a href="value_at_c.html" title="value_at_c">value_at_c</a></h5></div></div></div>
<a name="fusion.sequences.intrinsics.metafunctions.value_at_c.description"></a><h6>
<a name="id513597"></a>
<a href="value_at_c.html#fusion.sequences.intrinsics.metafunctions.value_at_c.description">Description</a>
</h6>
<p>
Returns the actual type at a given index from the <a href="../../../sequences.html" title="Sequences">Sequence</a>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.value_at_c.synopsis"></a><h6>
<a name="id513638"></a>
<a href="value_at_c.html#fusion.sequences.intrinsics.metafunctions.value_at_c.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">Seq</span><span class="special">,</span>
<span class="keyword">int</span> <span class="identifier">M</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">value_at_c</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="id513758"></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="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Argument sequence</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">M</span></tt></td>
<td>Positive
integer index</td>
<td>Index of element</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.sequences.intrinsics.metafunctions.value_at_c.expression_semantics"></a><h6>
<a name="id513858"></a>
<a href="value_at_c.html#fusion.sequences.intrinsics.metafunctions.value_at_c.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at_c</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">,</span> <span class="identifier">M</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 actual type at
the <tt class="computeroutput"><span class="identifier">M</span></tt>th element of <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.value_at_c.header"></a><h6>
<a name="id513983"></a>
<a href="value_at_c.html#fusion.sequences.intrinsics.metafunctions.value_at_c.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">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">value_at</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequences.intrinsics.metafunctions.value_at_c.example"></a><h6>
<a name="id514089"></a>
<a href="value_at_c.html#fusion.sequences.intrinsics.metafunctions.value_at_c.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../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">float</span><span class="special">,</span><span class="keyword">char</span><span class="special">&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="value_at_c.html" title="value_at_c"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at_c</span></tt></a><span class="special">&lt;</span><span class="identifier">vec</span><span class="special">,</span> <span class="number">1</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">float</span><span class="special">&gt;));</span>
</pre>
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<div class="titlepage"><div><div><h5 class="title">
<a name="fusion.sequences.intrinsics.metafunctions.value_at_key"></a><a href="value_at_key.html" title="value_at_key">value_at_key</a></h5></div></div></div>
<a name="fusion.sequences.intrinsics.metafunctions.value_at_key.description"></a><h6>
<a name="id516141"></a>
<a href="value_at_key.html#fusion.sequences.intrinsics.metafunctions.value_at_key.description">Description</a>
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<p>
Returns the actual element type associated with a Key from the <a href="../../../sequences.html" title="Sequences">Sequence</a>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.value_at_key.synopsis"></a><h6>
<a name="id516182"></a>
<a href="value_at_key.html#fusion.sequences.intrinsics.metafunctions.value_at_key.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">Seq</span><span class="special">,</span>
<span class="keyword">typename</span> <span class="identifier">Key</span><span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">value_at_key</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>
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<h4>
<a name="id516303"></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="../../concepts/forward_sequence.html" title="Forward
Sequence">Forward
Sequence</a>
</td>
<td>Argument sequence</td>
</tr>
<tr>
<td><tt class="computeroutput"><span class="identifier">Key</span></tt></td>
<td>Any
type</td>
<td>Key type</td>
</tr>
</tbody>
</table>
</div>
<a name="fusion.sequences.intrinsics.metafunctions.value_at_key.expression_semantics"></a><h6>
<a name="id516403"></a>
<a href="value_at_key.html#fusion.sequences.intrinsics.metafunctions.value_at_key.expression_semantics">Expression
Semantics</a>
</h6>
<pre class="programlisting">
<span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_at_key</span><span class="special">&lt;</span><span class="identifier">Seq</span><span class="special">,</span> <span class="identifier">Key</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 actual element
type associated with key type <tt class="computeroutput"><span class="identifier">Key</span></tt>
in <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
</p>
<a name="fusion.sequences.intrinsics.metafunctions.value_at_key.header"></a><h6>
<a name="id516526"></a>
<a href="value_at_key.html#fusion.sequences.intrinsics.metafunctions.value_at_key.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">sequence</span><span class="special">/</span><span class="identifier">intrinsic</span><span class="special">/</span><span class="identifier">value_at_key</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.sequences.intrinsics.metafunctions.value_at_key.example"></a><h6>
<a name="id516633"></a>
<a href="value_at_key.html#fusion.sequences.intrinsics.metafunctions.value_at_key.example">Example</a>
</h6>
<pre class="programlisting">
<span class="keyword">typedef</span> <a href="../../containers/map.html" title="map"><tt class="computeroutput"><span class="identifier">map</span></tt></a><span class="special">&lt;</span><a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;,</span> <a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;,</span> <a href="../../../support/pair.html" title="pair"><tt class="computeroutput"><span class="identifier">pair</span></tt></a><span class="special">&lt;</span><span class="keyword">double</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">mymap</span><span class="special">;</span>
<span class="identifier">BOOST_MPL_ASSERT</span><span class="special">((</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">is_same</span><span class="special">&lt;</span><a href="at_key.html" title="at_key"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_key</span></tt></a><span class="special">&lt;</span><span class="identifier">mymap</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">char</span><span class="special">&gt;));</span>
</pre>
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