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

[SVN r58618]
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Christopher Schmidt
2010-01-01 22:00:21 +00:00
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>value_at</title>
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<link rel="home" href="../../../../index.html" title="Chapter<65>1.<2E>Fusion 2.0">
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<link rel="up" href="../metafunctions.html" title="Metafunctions">
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<div></div>
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<a name="fusion.sequence.intrinsic.metafunctions.value_at.description"></a><h6>
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<a href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.description">Description</a>
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<a class="link" href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.description">Description</a>
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</h6>
<p>
Returns the actual type at a given index from the <a href="../../../sequence.html" title="Sequence">Sequence</a>.
</p>
<a name="fusion.sequence.intrinsic.metafunctions.value_at.synopsis"></a><h6>
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<a href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.synopsis">Synopsis</a>
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<a class="link" href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.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">,</span>
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<span class="special">};</span>
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<div class="table">
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<a name="id465644"></a><p class="title"><b>Table<EFBFBD>1.27.<2E>Parameters</b></p>
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<colgroup>
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<a href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.expression_semantics">Expression
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<a class="link" href="value_at.html#fusion.sequence.intrinsic.metafunctions.value_at.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">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>
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<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>
<p>
/sequence/intrinsic/value_at.hpp&gt;
</p>
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<a class="link" href="value_at.html#fusion.sequence.intrinsic.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>
<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">value_at</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
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<a name="fusion.sequence.intrinsic.metafunctions.value_at.example"></a><h6>
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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">,</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>
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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>)