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- <div class="section" id="order">
- <h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1440">order</a></h1>
- <div class="section" id="id309">
- <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
- <pre class="literal-block">
- template<
- typename Sequence
- , typename Key
- >
- struct <a href="./order.html" class="identifier">order</a>
- {
- typedef <em>unspecified</em> type;
- };
- </pre>
- </div>
- <div class="section" id="id310">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p>Returns a unique unsigned <a class="reference internal" href="./integral-constant.html">Integral Constant</a> associated with the key <tt class="literal"><span class="pre">Key</span></tt> in
- <tt class="literal"><span class="pre">Sequence</span></tt>.</p>
- </div>
- <div class="section" id="id311">
- <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
- <pre class="literal-block">
- #include <<a href="../../../../boost/mpl/order.hpp" class="header">boost/mpl/order.hpp</a>>
- </pre>
- </div>
- <div class="section" id="id312">
- <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
- <p><a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a></p>
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- <div class="section" id="id313">
- <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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- <tr><th class="head">Parameter</th>
- <th class="head">Requirement</th>
- <th class="head">Description</th>
- </tr>
- </thead>
- <tbody valign="top">
- <tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
- <td><a class="reference internal" href="./associative-sequence.html">Associative Sequence</a></td>
- <td>A sequence to query.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">Key</span></tt></td>
- <td>Any type</td>
- <td>The queried key.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id314">
- <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
- <p>For any <a class="reference internal" href="./associative-sequence.html">Associative Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, and arbitrary type <tt class="literal"><span class="pre">key</span></tt>:</p>
- <pre class="literal-block">
- typedef <a href="./order.html" class="identifier">order</a><s,key>::type n;
- </pre>
- <table class="docutils field-list" frame="void" rules="none">
- <col class="field-name" />
- <col class="field-body" />
- <tbody valign="top">
- <tr class="field"><th class="field-name">Return type:</th><td class="field-body">Unsigned <a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</td>
- </tr>
- <tr class="field"><th class="field-name">Semantics:</th><td class="field-body">If <tt class="literal"><span class="pre"><a href="./has-key.html" class="identifier">has_key</a><s,key>::value</span> <span class="pre">==</span> <span class="pre">true</span></tt>, <tt class="literal"><span class="pre">n</span></tt> is a unique unsigned
- <a class="reference internal" href="./integral-constant.html">Integral Constant</a> associated with <tt class="literal"><span class="pre">key</span></tt> in <tt class="literal"><span class="pre">s</span></tt>; otherwise,
- <tt class="literal"><span class="pre">n</span></tt> is identical to <tt class="literal"><span class="pre"><a href="./void.html" class="identifier">void_</a></span></tt>.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id315">
- <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
- <p>Amortized constant time.</p>
- </div>
- <div class="section" id="id316">
- <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
- <pre class="literal-block">
- typedef <a href="./map.html" class="identifier">map</a>< <a href="./pair.html" class="identifier">pair</a><int,unsigned>, <a href="./pair.html" class="identifier">pair</a><char,long> > m;
- <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( is_same< <a href="./order.html" class="identifier">order</a><m,int>::type, <a href="./void.html" class="identifier">void_</a> > ));
- <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same< <a href="./order.html" class="identifier">order</a><m,long>::type,<a href="./void.html" class="identifier">void_</a> > ));
- </pre>
- </div>
- <div class="section" id="id317">
- <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
- <p><a class="reference internal" href="./associative-sequence.html">Associative Sequence</a>, <a class="reference internal" href="./has-key.html">has_key</a>, <a class="reference internal" href="./count.html">count</a>, <a class="reference internal" href="./map.html">map</a></p>
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