forked from boostorg/fusion
fusion: merge of associative iterators/views and the new fold interface
[SVN r58618]
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
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<title>begin</title>
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<link rel="stylesheet" href="../../../../../../../../doc/html/boostbook.css" type="text/css">
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<<<<<<< .working
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<meta name="generator" content="DocBook XSL Stylesheets V1.65.1">
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<link rel="home" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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=======
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<link rel="home" href="../../../../index.html" title="Chapter 1. Fusion 2.0">
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<link rel="up" href="../metafunctions.html" title="Metafunctions">
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<link rel="previous" href="../metafunctions.html" title="Metafunctions">
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<div></div>
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<a name="fusion.sequence.intrinsic.metafunctions.begin.description"></a><h6>
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<a name="id460036"></a>
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<a href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.description">Description</a>
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<a class="link" href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.description">Description</a>
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</h6>
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<p>
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Returns the result type of <a href="../functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a>.
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</p>
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<a name="fusion.sequence.intrinsic.metafunctions.begin.synopsis"></a><h6>
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<a name="id460084"></a>
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<a href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.synopsis">Synopsis</a>
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<a class="link" href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.synopsis">Synopsis</a>
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</h6>
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<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Seq</span><span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">begin</span>
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<span class="special">};</span>
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</pre>
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<div class="table">
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<a name="id460180"></a><p class="title"><b>Table<EFBFBD>1.19.<2E>Parameters</b></p>
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<table class="table" summary="Parameters">
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<a name="id712610"></a><p class="title"><b>Table<EFBFBD>1.19.<2E>Parameters</b></p>
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<a name="id672422"></a><p class="title"><b>Table<EFBFBD>1.23.<2E>Parameters</b></p>
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<a name="id664776"></a><p class="title"><b>Table<EFBFBD>1.23.<2E>Parameters</b></p>
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<a name="id685072"></a><p class="title"><b>Table 1.23. Parameters</b></p>
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<a name="id674843"></a><p class="title"><b>Table 1.23. Parameters</b></p>
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<div class="table-contents"><table class="table" summary="Parameters">
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<colgroup>
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<col>
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<col>
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</tr></tbody>
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</table>
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</div>
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<<<<<<< .working
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<a name="fusion.sequence.intrinsic.metafunctions.begin.expression_semantics"></a><h6>
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<a name="id460281"></a>
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<a href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.expression_semantics">Expression
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<br class="table-break"><a name="fusion.sequence.intrinsic.metafunctions.begin.expression_semantics"></a><h6>
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<a class="link" href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.expression_semantics">Expression
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Semantics</a>
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</h6>
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<pre class="programlisting"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">begin</span><span class="special"><</span><span class="identifier">Seq</span><span class="special">>::</span><span class="identifier">type</span>
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</pre>
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<p>
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<span class="bold"><b>Return type</b></span>: An iterator modelling the
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same traversal concept as <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
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<span class="bold"><strong>Return type</strong></span>:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" type="disc">
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<li class="listitem">
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A model of <a class="link" href="../../../iterator/concepts/forward_iterator.html" title="Forward Iterator">Forward
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Iterator</a> if <code class="computeroutput"><span class="identifier">seq</span></code>
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is a <a class="link" href="../../concepts/forward_sequence.html" title="Forward Sequence">Forward
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Sequence</a> else, <a class="link" href="../../../iterator/concepts/bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional
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Iterator</a> if <code class="computeroutput"><span class="identifier">seq</span></code>
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is a <a class="link" href="../../concepts/bidirectional_sequence.html" title="Bidirectional Sequence">Bidirectional
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Sequence</a> else, <a class="link" href="../../../iterator/concepts/random_access_iterator.html" title="Random Access Iterator">Random
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Access Iterator</a> if <code class="computeroutput"><span class="identifier">seq</span></code>
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is a <a class="link" href="../../concepts/random_access_sequence.html" title="Random Access Sequence">Random
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Access Sequence</a>.
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</li>
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<li class="listitem">
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A model of <a class="link" href="../../../iterator/concepts/associative_iterator.html" title="Associative Iterator">Associative
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Iterator</a> if <code class="computeroutput"><span class="identifier">seq</span></code>
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is an <a class="link" href="../../concepts/associative_sequence.html" title="Associative Sequence">Associative
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Sequence</a>.
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</li>
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</ul></div>
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<p>
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<span class="bold"><b>Semantics</b></span>: Returns the type of an iterator
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to the first element of <tt class="computeroutput"><span class="identifier">Seq</span></tt>.
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</p>
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<p>
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/sequence/intrinsic/begin.hpp>
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</p>
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<a name="fusion.sequence.intrinsic.metafunctions.begin.header"></a><h6>
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<a name="id671793"></a>
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<a class="link" href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.header">Header</a>
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</h6>
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<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">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">></span>
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">begin</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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</pre>
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<a name="fusion.sequence.intrinsic.metafunctions.begin.example"></a><h6>
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<a href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.example">Example</a>
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<a class="link" href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.example">Example</a>
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</h6>
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<pre class="programlisting"><span class="keyword">typedef</span> <a href="../../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">vec</span><span class="special">;</span>
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<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"><</span><span class="identifier">vec</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">it</span><span class="special">;</span>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright <EFBFBD> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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<td align="right"><div class="copyright-footer">Copyright © 2001-2007 Joel de Guzman, Dan Marsden, Tobias
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Schwinger<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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