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<td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./algorithms.html" class="navigation-link">Algorithms</a> / <a href="./transformation-algorithms.html" class="navigation-link">Transformation Algorithms</a> / <a href="./partition.html" class="navigation-link">partition</a></td>
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<div class="section" id="partition">
<h1><a class="toc-backref" href="./transformation-algorithms.html#id1494">partition</a></h1>
<div class="section" id="id687">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
template&lt;
      typename Seq
    , typename Pred
    , typename In1 = <em>unspecified</em>
    , typename In2 = <em>unspecified</em>
    &gt;
struct <a href="./partition.html" class="identifier">partition</a>
{
    typedef <em>unspecified</em> type;
};
</pre>
</div>
<div class="section" id="id688">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p>Returns a pair of sequences together containing all elements in the range
[<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a>&lt;Seq&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;Seq&gt;::type</span></tt>) split into two groups based on the predicate <tt class="literal"><span class="pre">Pred</span></tt>.
<tt class="literal"><span class="pre"><a href="./partition.html" class="identifier">partition</a></span></tt> is a synonym for <a class="reference internal" href="./stable-partition.html">stable_partition</a>.</p>
<p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the
<cite>Expression semantics</cite> subsection for a precise specification of the algorithm's
details in all cases — <em>end note</em>]</p>
</div>
<div class="section" id="id689">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/partition.hpp" class="header">boost/mpl/partition.hpp</a>&gt;
</pre>
</div>
<div class="section" id="id690">
<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
<p><a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a></p>
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<div class="section" id="id691">
<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">Seq</span></tt></td>
<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
<td>An original sequence.</td>
</tr>
<tr><td><tt class="literal"><span class="pre">Pred</span></tt></td>
<td>Unary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td>
<td>A partitioning predicate.</td>
</tr>
<tr><td><tt class="literal"><span class="pre">In1</span></tt>, <tt class="literal"><span class="pre">In2</span></tt></td>
<td><a class="reference internal" href="./inserter.html">Inserter</a></td>
<td>Output inserters.</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="id692">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>The semantics of an expression are defined only
where they differ from, or are not defined in <a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p>
<p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, an unary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">pred</span></tt>, and <a class="reference internal" href="./inserter.html">Inserter</a>s
<tt class="literal"><span class="pre">in1</span></tt> and <tt class="literal"><span class="pre">in2</span></tt>:</p>
<pre class="literal-block">
typedef <a href="./partition.html" class="identifier">partition</a>&lt;s,pred,in1,in2&gt;::type r;
</pre>
<table class="docutils field-list" frame="void" rules="none">
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<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A <a class="reference internal" href="./pair.html">pair</a>.</p>
</td>
</tr>
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
<pre class="last literal-block">
typedef <a href="./stable-partition.html" class="identifier">stable_partition</a>&lt;s,pred,in1,in2&gt;::type r;
</pre>
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<div class="section" id="id693">
<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
<p>Linear. Exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span></tt> applications of <tt class="literal"><span class="pre">pred</span></tt>, and <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span></tt>
of summarized <tt class="literal"><span class="pre">in1::operation</span></tt> / <tt class="literal"><span class="pre">in2::operation</span></tt> applications.</p>
</div>
<div class="section" id="id694">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
template&lt; typename N &gt; struct is_odd : <a href="./bool.html" class="identifier">bool_</a>&lt;(N::value % 2)&gt; {};

typedef <a href="./partition.html" class="identifier">partition</a>&lt;
      <a href="./range-c.html" class="identifier">range_c</a>&lt;int,0,10&gt;
    , is_odd&lt;<a href="./placeholders.html" class="identifier">_1</a>&gt;
    , <a href="./back-inserter.html" class="identifier">back_inserter</a>&lt; <a href="./vector.html" class="identifier">vector</a>&lt;&gt; &gt;
    , <a href="./back-inserter.html" class="identifier">back_inserter</a>&lt; <a href="./vector.html" class="identifier">vector</a>&lt;&gt; &gt;
    &gt;::type r;

<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>&lt; r::first, <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,1,3,5,7,9&gt; &gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>&lt; r::second, <a href="./vector-c.html" class="identifier">vector_c</a>&lt;int,0,2,4,6,8&gt; > ));
</pre>
</div>
<div class="section" id="id695">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference internal" href="./transformation-algorithms.html">Transformation Algorithms</a>, <a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a>, <a class="reference internal" href="./reverse-partition.html">reverse_partition</a>, <a class="reference internal" href="./stable-partition.html">stable_partition</a>, <a class="reference internal" href="./sort.html">sort</a></p>
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