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10<title>The MPL Reference Manual: partition</title>
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14<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./unique.html" class="navigation-link">Prev</a>&nbsp;<a href="./stable-partition.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./unique.html" class="navigation-link">Back</a>&nbsp;<a href="./stable-partition.html" class="navigation-link">Along</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./transformation-algorithms.html" class="navigation-link">Up</a>&nbsp;<a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td>
15<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>
16</tr></table><div class="header-separator"></div>
17<div class="section" id="partition">
18<h1><a class="toc-backref" href="./transformation-algorithms.html#id422" name="partition">partition</a></h1>
19<div class="section" id="partition-synopsis">
20<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
21<pre class="literal-block">
22template&lt;
23      typename Seq
24    , typename Pred
25    , typename In1 = <em>unspecified</em>
26    , typename In2 = <em>unspecified</em>
27    &gt;
28struct <a href="./partition.html" class="identifier">partition</a>
29{
30    typedef <em>unspecified</em> type;
31};
32</pre>
33</div>
34<div class="section" id="partition-description">
35<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
36<p>Returns a pair of sequences together containing all elements in the range
37[<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>.
38<tt class="literal"><span class="pre"><a href="./partition.html" class="identifier">partition</a></span></tt> is a synonym for <a class="refentry reference" href="./stable-partition.html"><tt class="refentry literal"><span class="pre">stable_partition</span></tt></a>.</p>
39<p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the
40<cite>Expression semantics</cite> subsection for a precise specification of the algorithm's
41details in all cases — <em>end note</em>]</p>
42</div>
43<div class="section" id="partition-header">
44<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
45<pre class="literal-block">
46#include &lt;<a href="../../../../boost/mpl/partition.hpp" class="header">boost/mpl/partition.hpp</a>&gt;
47</pre>
48</div>
49<div class="section" id="partition-model-of">
50<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
51<p><a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a></p>
52</div>
53<div class="section" id="partition-parameters">
54<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
55<table border="1" class="table">
56<colgroup>
57<col width="22%" />
58<col width="41%" />
59<col width="36%" />
60</colgroup>
61<thead valign="bottom">
62<tr><th>Parameter</th>
63<th>Requirement</th>
64<th>Description</th>
65</tr>
66</thead>
67<tbody valign="top">
68<tr><td><tt class="literal"><span class="pre">Seq</span></tt></td>
69<td><a class="reference" href="./forward-sequence.html">Forward Sequence</a></td>
70<td>An original sequence.</td>
71</tr>
72<tr><td><tt class="literal"><span class="pre">Pred</span></tt></td>
73<td>Unary <a class="reference" href="./lambda-expression.html">Lambda Expression</a></td>
74<td>A partitioning predicate.</td>
75</tr>
76<tr><td><tt class="literal"><span class="pre">In1</span></tt>, <tt class="literal"><span class="pre">In2</span></tt></td>
77<td><a class="reference" href="./inserter.html">Inserter</a></td>
78<td>Output inserters.</td>
79</tr>
80</tbody>
81</table>
82</div>
83<div class="section" id="partition-expression-semantics">
84<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
85<p>The semantics of an expression are defined only
86where they differ from, or are not defined in <a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p>
87<p>For any <a class="reference" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, an unary <a class="reference" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">pred</span></tt>, and <a class="reference" href="./inserter.html">Inserter</a>s
88<tt class="literal"><span class="pre">in1</span></tt> and <tt class="literal"><span class="pre">in2</span></tt>:</p>
89<pre class="literal-block">
90typedef <a href="./partition.html" class="identifier">partition</a>&lt;s,pred,in1,in2&gt;::type r;
91</pre>
92<table class="field-list" frame="void" rules="none">
93<col class="field-name" />
94<col class="field-body" />
95<tbody valign="top">
96<tr class="field"><th class="field-name">Return type:</th><td class="field-body">A <a class="refentry reference" href="./pair.html"><tt class="refentry literal"><span class="pre">pair</span></tt></a>.</td>
97</tr>
98<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
99<pre class="last literal-block">
100typedef <a href="./stable-partition.html" class="identifier">stable_partition</a>&lt;s,pred,in1,in2&gt;::type r;
101</pre>
102</td>
103</tr>
104</tbody>
105</table>
106</div>
107<div class="section" id="partition-complexity">
108<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
109<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> 
110of summarized <tt class="literal"><span class="pre">in1::operation</span></tt> / <tt class="literal"><span class="pre">in2::operation</span></tt> applications.</p>
111</div>
112<div class="section" id="partition-example">
113<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
114<pre class="literal-block">
115template&lt; typename N &gt; struct is_odd : <a href="./bool.html" class="identifier">bool_</a>&lt;(N::value % 2)&gt; {};
116
117typedef <a href="./partition.html" class="identifier">partition</a>&lt;
118      <a href="./range-c.html" class="identifier">range_c</a>&lt;int,0,10&gt; 
119    , is_odd&lt;_1&gt;
120    , <a href="./back-inserter.html" class="identifier">back_inserter</a>&lt; <a href="./vector.html" class="identifier">vector</a>&lt;&gt; &gt;
121    , <a href="./back-inserter.html" class="identifier">back_inserter</a>&lt; <a href="./vector.html" class="identifier">vector</a>&lt;&gt; &gt;
122    &gt;::type r;
123
124<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; ));
125<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; > ));
126</pre>
127</div>
128<div class="section" id="partition-see-also">
129<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
130<p><a class="reference" href="./transformation-algorithms.html">Transformation Algorithms</a>, <a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a>, <a class="refentry reference" href="./reverse-partition.html"><tt class="refentry literal"><span class="pre">reverse_partition</span></tt></a>, <a class="refentry reference" href="./stable-partition.html"><tt class="refentry literal"><span class="pre">stable_partition</span></tt></a>, <a class="refentry reference" href="./sort.html"><tt class="refentry literal"><span class="pre">sort</span></tt></a></p>
131<!-- modtime: November 10, 2004 04:34:29 +0000 -->
132<!-- Algorithms/Transformation Algorithms//stable_partition |90 -->
133</div>
134</div>
135
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