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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.metafunctions.value_of"></a><a href="value_of.html" title="value_of">value_of</a></h4></div></div></div>
<a name="fusion.iterator.metafunctions.value_of.description"></a><h5>
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<a href="value_of.html#fusion.iterator.metafunctions.value_of.description">Description</a>
</h5>
<p>
Returns the type stored at the position of an iterator.
</p>
<a name="fusion.iterator.metafunctions.value_of.synopsis"></a><h5>
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<a href="value_of.html#fusion.iterator.metafunctions.value_of.synopsis">Synopsis</a>
</h5>
<pre class="programlisting">
<span class="keyword">template</span><span class="special">&lt;</span>
<span class="keyword">typename</span> <span class="identifier">I</span>
<span class="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">value_of</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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<a name="id480554"></a><p class="title"><b>Table<EFBFBD>1.11.<2E>Parameters</b></p>
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<table class="table" summary="Parameters">
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<th>
<p>
Parameter
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<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
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<td>
<p>
<tt class="computeroutput"><span class="identifier">I</span></tt>
</p>
</td>
<td>
<p>
Model of <a href="../concepts/forward_iterator.html" title="Forward
Iterator">Forward
Iterator</a>
</p>
</td>
<td>
<p>
Operation's argument
</p>
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<a name="fusion.iterator.metafunctions.value_of.expression_semantics"></a><h5>
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<a href="value_of.html#fusion.iterator.metafunctions.value_of.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="value_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_of</span></tt></a><span class="special">&lt;</span><span class="identifier">I</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 type stored in
a sequence at iterator position <tt class="computeroutput"><span class="identifier">I</span></tt>.
</p>
<p>
/iterator/value_of.hpp&gt;
</p>
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<a href="value_of.html#fusion.iterator.metafunctions.value_of.example">Example</a>
</h5>
<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">int</span><span class="special">&amp;,</span><span class="keyword">const</span> <span class="keyword">int</span><span class="special">&amp;&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="../../sequence/intrinsic/metafunctions/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">first</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">second</span><span class="special">;</span>
<span class="keyword">typedef</span> <a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">next</span></tt></a><span class="special">&lt;</span><span class="identifier">second</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">third</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_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_of</span></tt></a><span class="special">&lt;</span><span class="identifier">first</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;));</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_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_of</span></tt></a><span class="special">&lt;</span><span class="identifier">second</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>
<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_of.html" title="value_of"><tt class="computeroutput"><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">value_of</span></tt></a><span class="special">&lt;</span><span class="identifier">third</span><span class="special">&gt;::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">const</span> <span class="keyword">int</span><span class="special">&amp;&gt;));</span>
</pre>
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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>)
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