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- <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<
- typename Iterator
- >
- struct <a href="./deref.html" class="identifier">deref</a>
- {
- typedef <em>unspecified</em> type;
- };
- </pre>
- </div>
- <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 <<a href="../../../../boost/mpl/deref.hpp" class="header">boost/mpl/deref.hpp</a>>
- </pre>
- </div>
- <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><iter>::type t;
- </pre>
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- <col class="field-name" />
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- <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type.</p>
- </td>
- </tr>
- <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>
- </td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id442">
- <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
- <p>Amortized constant time.</p>
- </div>
- <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><char,short,int,long> types;
- typedef <a href="./begin.html" class="identifier">begin</a><types>::type iter;
- <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./deref.html" class="identifier">deref</a><iter>::type, char > ));
- </pre>
- </div>
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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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