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boost_fusion/doc/html/fusion/iterator/functions/deref.html
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<title>deref</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="fusion.iterator.functions.deref"></a><a href="deref.html" title="deref">deref</a></h4></div></div></div>
<a name="fusion.iterator.functions.deref.description"></a><h5>
<a name="id473973"></a>
<a href="deref.html#fusion.iterator.functions.deref.description">Description</a>
</h5>
<p>
Deferences an iterator.
</p>
<a name="fusion.iterator.functions.deref.synopsis"></a><h5>
<a name="id474003"></a>
<a href="deref.html#fusion.iterator.functions.deref.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">typename</span> <a href="../metafunctions/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">&lt;</span><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span> <span class="identifier">deref</span><span class="special">(</span><span class="identifier">I</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">i</span><span class="special">);</span>
</pre>
<div class="table">
<a name="id474148"></a><p class="title"><b>Table 1.2. Parameters</b></p>
<table class="table" summary="Parameters">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Requirement
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody><tr>
<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>
</td>
</tr></tbody>
</table>
</div>
<a name="fusion.iterator.functions.deref.expression_semantics"></a><h5>
<a name="id474250"></a>
<a href="deref.html#fusion.iterator.functions.deref.expression_semantics">Expression
Semantics</a>
</h5>
<pre class="programlisting">
<a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><span class="identifier">i</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><b>Return type</b></span>: <tt class="computeroutput"><a href="../metafunctions/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">&lt;</span><span class="identifier">I</span><span class="special">&gt;::</span><span class="identifier">type</span></tt>
</p>
<p>
<span class="bold"><b>Semantics</b></span>: Dereferences the iterator
<tt class="computeroutput"><span class="identifier">i</span></tt>.
</p>
<a name="fusion.iterator.functions.deref.header"></a><h5>
<a name="id474398"></a>
<a href="deref.html#fusion.iterator.functions.deref.header">Header</a>
</h5>
<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">iterator</span><span class="special">/</span><span class="identifier">deref</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">deref</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<a name="fusion.iterator.functions.deref.example"></a><h5>
<a name="id474555"></a>
<a href="deref.html#fusion.iterator.functions.deref.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;&gt;</span> <span class="identifier">vec</span><span class="special">;</span>
<span class="keyword">int</span> <span class="identifier">i</span><span class="special">(</span><span class="number">0</span><span class="special">);</span>
<span class="identifier">vec</span> <span class="identifier">v</span><span class="special">(</span><span class="number">1</span><span class="special">,</span><span class="identifier">i</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">))</span> <span class="special">==</span> <span class="number">1</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">)))</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span>
<span class="identifier">assert</span><span class="special">(&amp;(</span><a href="deref.html" title="deref"><tt class="computeroutput"><span class="identifier">deref</span></tt></a><span class="special">(</span><a href="next.html" title="next"><tt class="computeroutput"><span class="identifier">next</span></tt></a><span class="special">(</span><a href="../../sequence/intrinsic/functions/begin.html" title="begin"><tt class="computeroutput"><span class="identifier">begin</span></tt></a><span class="special">(</span><span class="identifier">v</span><span class="special">))))</span> <span class="special">==</span> <span class="special">&amp;</span><span class="identifier">i</span><span class="special">);</span>
</pre>
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