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<div class="section" id="deref">
<h1><a class="toc-backref" href="./iterator-metafunctions.html#id1458">deref</a></h1>
<div class="section" id="id437">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
template&lt;
      typename Iterator
    &gt;
struct <a href="./deref.html" class="identifier">deref</a>
{
    typedef <em>unspecified</em> type;
};
</pre>
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<div class="section" id="id438">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p>Dereferences an iterator.</p>
</div>
<div class="section" id="id439">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/deref.hpp" class="header">boost/mpl/deref.hpp</a>&gt;
</pre>
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<div class="section" id="id440">
<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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<th class="head">Requirement</th>
<th class="head">Description</th>
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<tr><td><tt class="literal"><span class="pre">Iterator</span></tt></td>
<td><a class="reference internal" href="./forward-iterator.html">Forward Iterator</a></td>
<td>The iterator to dereference.</td>
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<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>For any <a class="reference internal" href="./forward-iterator.html">Forward Iterator</a>s <tt class="literal"><span class="pre">iter</span></tt>:</p>
<pre class="literal-block">
typedef <a href="./deref.html" class="identifier">deref</a>&lt;iter&gt;::type t;
</pre>
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<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type.</p>
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<tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre">iter</span></tt> is dereferenceable.</p>
</td>
</tr>
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre">t</span></tt> is identical to the element referenced by <tt class="literal"><span class="pre">iter</span></tt>. If <tt class="literal"><span class="pre">iter</span></tt> is
a user-defined iterator, the library-provided default implementation is
equivalent to</p>
<pre class="last literal-block">
typedef iter::type t;
</pre>
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<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
<p>Amortized constant time.</p>
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<div class="section" id="id443">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
typedef <a href="./vector.html" class="identifier">vector</a>&lt;char,short,int,long&gt; types;
typedef <a href="./begin.html" class="identifier">begin</a>&lt;types&gt;::type iter;

<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; <a href="./deref.html" class="identifier">deref</a>&lt;iter&gt;::type, char > ));
</pre>
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<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference internal" href="./iterators.html">Iterators</a>, <a class="reference internal" href="./begin.html">begin</a> / <a class="reference internal" href="./end.html">end</a>, <a class="reference internal" href="./next.html">next</a></p>
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