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- <title>The MPL Reference Manual: partition</title>
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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<
- typename Seq
- , typename Pred
- , typename In1 = <em>unspecified</em>
- , typename In2 = <em>unspecified</em>
- >
- 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><Seq>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><Seq>::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 <<a href="../../../../boost/mpl/partition.hpp" class="header">boost/mpl/partition.hpp</a>>
- </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>
- </div>
- <div class="section" id="id691">
- <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
- <table border="1" class="docutils table">
- <colgroup>
- <col width="22%" />
- <col width="41%" />
- <col width="36%" />
- </colgroup>
- <thead valign="bottom">
- <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">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><s,pred,in1,in2>::type r;
- </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"><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><s,pred,in1,in2>::type r;
- </pre>
- </td>
- </tr>
- </tbody>
- </table>
- </div>
- <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><s>::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><s>::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< typename N > struct is_odd : <a href="./bool.html" class="identifier">bool_</a><(N::value % 2)> {};
- typedef <a href="./partition.html" class="identifier">partition</a><
- <a href="./range-c.html" class="identifier">range_c</a><int,0,10>
- , is_odd<<a href="./placeholders.html" class="identifier">_1</a>>
- , <a href="./back-inserter.html" class="identifier">back_inserter</a>< <a href="./vector.html" class="identifier">vector</a><> >
- , <a href="./back-inserter.html" class="identifier">back_inserter</a>< <a href="./vector.html" class="identifier">vector</a><> >
- >::type r;
- <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>< r::first, <a href="./vector-c.html" class="identifier">vector_c</a><int,1,3,5,7,9> > ));
- <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>< r::second, <a href="./vector-c.html" class="identifier">vector_c</a><int,0,2,4,6,8> > ));
- </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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