ceph/src/boost/libs/mpl/doc/refmanual/order.html

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   7 <title>The MPL Reference Manual: order</title>
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  12 <td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./sequences.html" class="navigation-link">Sequences</a> / <a href="./intrinsic-metafunctions.html" class="navigation-link">Intrinsic Metafunctions</a> / <a href="./order.html" class="navigation-link">order</a></td>
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  14 <div class="section" id="order">
  15 <h1><a class="toc-backref" href="./intrinsic-metafunctions.html#id1440">order</a></h1>
  16 <div class="section" id="id309">
  17 <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
  18 <pre class="literal-block">
  19 template&lt;
  20       typename Sequence
  21     , typename Key
  22     &gt;
  23 struct <a href="./order.html" class="identifier">order</a>
  24 {
  25     typedef <em>unspecified</em> type;
  26 };
  27 </pre>
  28 </div>
  29 <div class="section" id="id310">
  30 <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
  31 <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
  32 <tt class="literal"><span class="pre">Sequence</span></tt>.</p>
  33 </div>
  34 <div class="section" id="id311">
  35 <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
  36 <pre class="literal-block">
  37 #include &lt;<a href="../../../../boost/mpl/order.hpp" class="header">boost/mpl/order.hpp</a>&gt;
  38 </pre>
  39 </div>
  40 <div class="section" id="id312">
  41 <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
  42 <p><a class="reference internal" href="./tag-dispatched-metafunction.html">Tag Dispatched Metafunction</a></p>
  43 </div>
  44 <div class="section" id="id313">
  45 <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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  48 <col width="17%" />
  49 <col width="30%" />
  50 <col width="53%" />
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  53 <tr><th class="head">Parameter</th>
  54 <th class="head">Requirement</th>
  55 <th class="head">Description</th>
  56 </tr>
  57 </thead>
  58 <tbody valign="top">
  59 <tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
  60 <td><a class="reference internal" href="./associative-sequence.html">Associative Sequence</a></td>
  61 <td>A sequence to query.</td>
  62 </tr>
  63 <tr><td><tt class="literal"><span class="pre">Key</span></tt></td>
  64 <td>Any type</td>
  65 <td>The queried key.</td>
  66 </tr>
  67 </tbody>
  68 </table>
  69 </div>
  70 <div class="section" id="id314">
  71 <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
  72 <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>
  73 <pre class="literal-block">
  74 typedef <a href="./order.html" class="identifier">order</a>&lt;s,key&gt;::type n;
  75 </pre>
  76 <table class="docutils field-list" frame="void" rules="none">
  77 <col class="field-name" />
  78 <col class="field-body" />
  79 <tbody valign="top">
  80 <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>
  81 </tr>
  82 <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>&lt;s,key&gt;::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
  83 <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,
  84 <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>
  85 </tr>
  86 </tbody>
  87 </table>
  88 </div>
  89 <div class="section" id="id315">
  90 <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
  91 <p>Amortized constant time.</p>
  92 </div>
  93 <div class="section" id="id316">
  94 <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
  95 <pre class="literal-block">
  96 typedef <a href="./map.html" class="identifier">map</a>&lt; <a href="./pair.html" class="identifier">pair</a>&lt;int,unsigned&gt;, <a href="./pair.html" class="identifier">pair</a>&lt;char,long&gt; &gt; m;
  97
  98 <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( is_same&lt; <a href="./order.html" class="identifier">order</a>&lt;m,int&gt;::type, <a href="./void.html" class="identifier">void_</a> &gt; ));
  99 <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( is_same&lt; <a href="./order.html" class="identifier">order</a>&lt;m,long&gt;::type,<a href="./void.html" class="identifier">void_</a> > ));
 100 </pre>
 101 </div>
 102 <div class="section" id="id317">
 103 <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
 104 <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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