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<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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<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&lt;
      typename Sequence
    , typename Key
    &gt;
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 &lt;<a href="../../../../boost/mpl/order.hpp" class="header">boost/mpl/order.hpp</a>&gt;
</pre>
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<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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<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>
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<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>
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<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>&lt;s,key&gt;::type n;
</pre>
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<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>&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
<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>&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;

<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; ));
<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> > ));
</pre>
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<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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