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7<title>The MPL Reference Manual: reverse_partition</title>
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11<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./reverse-unique.html" class="navigation-link">Prev</a>&nbsp;<a href="./reverse-stable-partition.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./reverse-unique.html" class="navigation-link">Back</a>&nbsp;<a href="./reverse-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>
12<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="./reverse-partition.html" class="navigation-link">reverse_partition</a></td>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="reverse-partition">
15<h1><a class="toc-backref" href="./transformation-algorithms.html#id434" name="reverse-partition">reverse_partition</a></h1>
16<div class="section" id="id180">
17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
18<pre class="literal-block">
19template&lt;
20      typename Seq
21    , typename Pred
22    , typename In1 = <em>unspecified</em>
23    , typename In2 = <em>unspecified</em>
24    &gt;
25struct <a href="./reverse-partition.html" class="identifier">reverse_partition</a>
26{
27    typedef <em>unspecified</em> type;
28};
29</pre>
30</div>
31<div class="section" id="id181">
32<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
33<p>Returns a pair of sequences together containing all elements in the range
34[<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>.
35<tt class="literal"><span class="pre"><a href="./reverse-partition.html" class="identifier">reverse_partition</a></span></tt> is a synonym for <a class="refentry reference" href="./reverse-stable-partition.html"><tt class="refentry literal"><span class="pre">reverse_stable_partition</span></tt></a>.</p>
36<p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the
37<cite>Expression semantics</cite> subsection for a precise specification of the algorithm's
38details in all cases — <em>end note</em>]</p>
39</div>
40<div class="section" id="id182">
41<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
42<pre class="literal-block">
43#include &lt;<a href="../../../../boost/mpl/partition.hpp" class="header">boost/mpl/partition.hpp</a>&gt;
44</pre>
45</div>
46<div class="section" id="id183">
47<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
48<p><a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a></p>
49</div>
50<div class="section" id="id184">
51<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
52<table border="1" class="table">
53<colgroup>
54<col width="22%" />
55<col width="41%" />
56<col width="36%" />
57</colgroup>
58<thead valign="bottom">
59<tr><th>Parameter</th>
60<th>Requirement</th>
61<th>Description</th>
62</tr>
63</thead>
64<tbody valign="top">
65<tr><td><tt class="literal"><span class="pre">Seq</span></tt></td>
66<td><a class="reference" href="./forward-sequence.html">Forward Sequence</a></td>
67<td>An original sequence.</td>
68</tr>
69<tr><td><tt class="literal"><span class="pre">Pred</span></tt></td>
70<td>Unary <a class="reference" href="./lambda-expression.html">Lambda Expression</a></td>
71<td>A partitioning predicate.</td>
72</tr>
73<tr><td><tt class="literal"><span class="pre">In1</span></tt>, <tt class="literal"><span class="pre">In2</span></tt></td>
74<td><a class="reference" href="./inserter.html">Inserter</a></td>
75<td>Output inserters.</td>
76</tr>
77</tbody>
78</table>
79</div>
80<div class="section" id="id185">
81<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
82<p>The semantics of an expression are defined only
83where they differ from, or are not defined in <a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p>
84<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
85<tt class="literal"><span class="pre">in1</span></tt> and <tt class="literal"><span class="pre">in2</span></tt>:</p>
86<pre class="literal-block">
87typedef <a href="./reverse-partition.html" class="identifier">reverse_partition</a>&lt;s,pred,in1,in2&gt;::type r;
88</pre>
89<table class="field-list" frame="void" rules="none">
90<col class="field-name" />
91<col class="field-body" />
92<tbody valign="top">
93<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>
94</tr>
95<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
96<pre class="last literal-block">
97typedef <a href="./reverse-stable-partition.html" class="identifier">reverse_stable_partition</a>&lt;s,pred,in1,in2&gt;::type r;
98</pre>
99</td>
100</tr>
101</tbody>
102</table>
103</div>
104<div class="section" id="id186">
105<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
106<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> 
107of summarized <tt class="literal"><span class="pre">in1::operation</span></tt> / <tt class="literal"><span class="pre">in2::operation</span></tt> applications.</p>
108</div>
109<div class="section" id="id187">
110<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
111<pre class="literal-block">
112template&lt; typename N &gt; struct is_odd : <a href="./bool.html" class="identifier">bool_</a>&lt;(N::value % 2)&gt; {};
113
114typedef <a href="./partition.html" class="identifier">partition</a>&lt;
115      <a href="./range-c.html" class="identifier">range_c</a>&lt;int,0,10&gt; 
116    , is_odd&lt;_1&gt;
117    , <a href="./back-inserter.html" class="identifier">back_inserter</a>&lt; <a href="./vector.html" class="identifier">vector</a>&lt;&gt; &gt;
118    , <a href="./back-inserter.html" class="identifier">back_inserter</a>&lt; <a href="./vector.html" class="identifier">vector</a>&lt;&gt; &gt;
119    &gt;::type r;
120
121<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,9,7,5,3,1&gt; &gt; ));
122<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,8,6,4,2,0&gt; > ));
123</pre>
124</div>
125<div class="section" id="id188">
126<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
127<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="./partition.html"><tt class="refentry literal"><span class="pre">partition</span></tt></a>, <a class="refentry reference" href="./reverse-stable-partition.html"><tt class="refentry literal"><span class="pre">reverse_stable_partition</span></tt></a>, <a class="refentry reference" href="./sort.html"><tt class="refentry literal"><span class="pre">sort</span></tt></a></p>
128<!-- modtime: November 10, 2004 04:32:43 +0000 -->
129<!-- Algorithms/Transformation Algorithms//reverse_stable_partition |190 -->
130</div>
131</div>
132
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