2006-08-22 15:57:13 +00:00
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<div class="section" lang="en">
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<div class="titlepage"><div><div><h4 class="title">
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<a name="fusion.iterators.metafunctions.deref"></a><a href="deref.html" title="deref">deref</a></h4></div></div></div>
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<a name="fusion.iterators.metafunctions.deref.description"></a><h5>
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2006-09-21 12:43:48 +00:00
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<a name="id469299"></a>
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2006-08-22 15:57:13 +00:00
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<a href="deref.html#fusion.iterators.metafunctions.deref.description">Description</a>
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</h5>
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<p>
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Returns the type that will be returned by dereferencing an iterator.
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</p>
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<a name="fusion.iterators.metafunctions.deref.synposis"></a><h5>
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2006-09-21 12:43:48 +00:00
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<a name="id469330"></a>
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2006-08-22 15:57:13 +00:00
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<a href="deref.html#fusion.iterators.metafunctions.deref.synposis">Synposis</a>
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</h5>
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<pre class="programlisting">
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<span class="keyword">template</span><span class="special"><</span>
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<span class="keyword">typename</span> <span class="identifier">I</span>
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<span class="special">></span>
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<span class="keyword">struct</span> <span class="identifier">deref</span>
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<span class="special">{</span>
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<span class="keyword">typedef</span> <span class="emphasis"><em>unspecified</em></span> <span class="identifier">type</span><span class="special">;</span>
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<span class="special">};</span>
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</pre>
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<div class="informaltable">
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<h4>
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2006-09-21 12:43:48 +00:00
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<a name="id469433"></a>
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2006-08-22 15:57:13 +00:00
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<span class="table-title">Parameters</span>
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</h4>
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<table class="table">
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<colgroup>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>Parameter</th>
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<th>Requirement</th>
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<th>Description</th>
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</tr></thead>
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<tbody><tr>
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<td><tt class="computeroutput"><span class="identifier">I</span></tt></td>
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<td>Model
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of <a href="../concepts/forward_iterator.html" title="Forward
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Iterator">Forward
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Iterator</a>
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</td>
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<td>Operation's argument</td>
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</tr></tbody>
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</table>
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</div>
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<a name="fusion.iterators.metafunctions.deref.expression_semantics"></a><h5>
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2006-09-21 12:43:48 +00:00
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<a name="id469510"></a>
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2006-08-22 15:57:13 +00:00
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<a href="deref.html#fusion.iterators.metafunctions.deref.expression_semantics">Expression
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Semantics</a>
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</h5>
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<pre class="programlisting">
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<a href="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"><</span><span class="identifier">I</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>: Any type
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</p>
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<p>
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<span class="bold"><b>Semantics</b></span>: Returns the result of dereferencing
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an iterator of type <tt class="computeroutput"><span class="identifier">I</span></tt>.
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</p>
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<a name="fusion.iterators.metafunctions.deref.header"></a><h5>
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2006-09-21 12:43:48 +00:00
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<a name="id469622"></a>
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2006-08-22 15:57:13 +00:00
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<a href="deref.html#fusion.iterators.metafunctions.deref.header">Header</a>
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</h5>
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<pre class="programlisting">
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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">iterator</span><span class="special">/</span><span class="identifier">deref</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.iterators.metafunctions.deref.example"></a><h5>
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2006-09-21 12:43:48 +00:00
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<a name="id469716"></a>
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2006-08-22 15:57:13 +00:00
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<a href="deref.html#fusion.iterators.metafunctions.deref.example">Example</a>
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</h5>
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<pre class="programlisting">
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<span class="keyword">typedef</span> <a href="../../sequences/containers/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="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> <span class="keyword">const</span> <span class="identifier">vec</span> <span class="identifier">const_vec</span><span class="special">;</span>
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<span class="keyword">typedef</span> <a href="../../sequences/intrinsics/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"><</span><span class="identifier">vec</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">first</span><span class="special">;</span>
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<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"><</span><span class="identifier">first</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">second</span><span class="special">;</span>
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<span class="keyword">typedef</span> <a href="../../sequences/intrinsics/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"><</span><span class="identifier">const_vec</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">const_first</span><span class="special">;</span>
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<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"><</span><span class="identifier">const_first</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">const_second</span><span class="special">;</span>
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<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"><</span><a href="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"><</span><span class="identifier">first</span><span class="special">>::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&>));</span>
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<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"><</span><a href="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"><</span><span class="identifier">second</span><span class="special">>::</span><span class="identifier">type</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&>));</span>
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</pre>
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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"><small>Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden</small></td>
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