fusion: merge of associative iterators/views and the new fold interface

[SVN r58618]
This commit is contained in:
Christopher Schmidt
2010-01-01 22:00:21 +00:00
parent b605617c4f
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>begin</title>
<link rel="stylesheet" href="../../../../../../../../doc/html/boostbook.css" type="text/css">
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<link rel="home" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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<link rel="home" href="../../../../index.html" title="Chapter&#160;1.&#160;Fusion 2.0">
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<link rel="up" href="../metafunctions.html" title="Metafunctions">
<link rel="previous" href="../metafunctions.html" title="Metafunctions">
<link rel="next" href="end.html" title="end">
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<div></div>
</div>
<a name="fusion.sequence.intrinsic.metafunctions.begin.description"></a><h6>
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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>
<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.sequence.intrinsic.metafunctions.begin.synopsis"></a><h6>
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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>
<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>
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<span class="special">};</span>
</pre>
<div class="table">
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<a name="id460180"></a><p class="title"><b>Table<EFBFBD>1.19.<2E>Parameters</b></p>
<table class="table" summary="Parameters">
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<a name="id672422"></a><p class="title"><b>Table<EFBFBD>1.23.<2E>Parameters</b></p>
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<div class="table-contents"><table class="table" summary="Parameters">
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<colgroup>
<col>
<col>
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</tr></tbody>
</table>
</div>
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<a href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.expression_semantics">Expression
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<a class="link" href="begin.html#fusion.sequence.intrinsic.metafunctions.begin.expression_semantics">Expression
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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>
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<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>.
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</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
A model of <a class="link" href="../../../iterator/concepts/forward_iterator.html" title="Forward Iterator">Forward
Iterator</a> if <code class="computeroutput"><span class="identifier">seq</span></code>
is a <a class="link" href="../../concepts/forward_sequence.html" title="Forward Sequence">Forward
Sequence</a> else, <a class="link" href="../../../iterator/concepts/bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional
Iterator</a> if <code class="computeroutput"><span class="identifier">seq</span></code>
is a <a class="link" href="../../concepts/bidirectional_sequence.html" title="Bidirectional Sequence">Bidirectional
Sequence</a> else, <a class="link" href="../../../iterator/concepts/random_access_iterator.html" title="Random Access Iterator">Random
Access Iterator</a> if <code class="computeroutput"><span class="identifier">seq</span></code>
is a <a class="link" href="../../concepts/random_access_sequence.html" title="Random Access Sequence">Random
Access Sequence</a>.
</li>
<li class="listitem">
A model of <a class="link" href="../../../iterator/concepts/associative_iterator.html" title="Associative Iterator">Associative
Iterator</a> if <code class="computeroutput"><span class="identifier">seq</span></code>
is an <a class="link" href="../../concepts/associative_sequence.html" title="Associative Sequence">Associative
Sequence</a>.
</li>
</ul></div>
<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>
<p>
/sequence/intrinsic/begin.hpp&gt;
</p>
<a name="fusion.sequence.intrinsic.metafunctions.begin.header"></a><h6>
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<a class="link" href="begin.html#fusion.sequence.intrinsic.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>
<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">include</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.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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</h6>
<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">&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>
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</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright <EFBFBD> 2001-2007 Joel de Guzman, Dan Marsden, Tobias
<td align="right"><div class="copyright-footer">Copyright &#169; 2001-2007 Joel de Guzman, Dan Marsden, Tobias
Schwinger<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
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>)