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| <title>The MPL Reference Manual: order</title> |
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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> |
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| </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> |
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| <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> |
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| <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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