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7<title>The MPL Reference Manual: reverse_stable_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-partition.html" class="navigation-link">Prev</a>&nbsp;<a href="./metafunctions.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./reverse-partition.html" class="navigation-link">Back</a>&nbsp;Along</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-stable-partition.html" class="navigation-link">reverse_stable_partition</a></td>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="reverse-stable-partition">
15<h1><a class="toc-backref" href="./transformation-algorithms.html#id435" name="reverse-stable-partition">reverse_stable_partition</a></h1>
16<div class="section" id="id190">
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-stable-partition.html" class="identifier">reverse_stable_partition</a>
26{
27    typedef <em>unspecified</em> type;
28};
29</pre>
30</div>
31<div class="section" id="id191">
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-stable-partition.html" class="identifier">reverse_stable_partition</a></span></tt> is guaranteed to preserve the reversed
36relative order of the elements in the resulting sequences.</p>
37<p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the
38<cite>Expression semantics</cite> subsection for a precise specification of the algorithm's
39details in all cases — <em>end note</em>]</p>
40</div>
41<div class="section" id="id192">
42<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
43<pre class="literal-block">
44#include &lt;<a href="../../../../boost/mpl/stable_partition.hpp" class="header">boost/mpl/stable_partition.hpp</a>&gt;
45</pre>
46</div>
47<div class="section" id="id193">
48<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
49<p><a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a></p>
50</div>
51<div class="section" id="id194">
52<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
53<table border="1" class="table">
54<colgroup>
55<col width="22%" />
56<col width="41%" />
57<col width="36%" />
58</colgroup>
59<thead valign="bottom">
60<tr><th>Parameter</th>
61<th>Requirement</th>
62<th>Description</th>
63</tr>
64</thead>
65<tbody valign="top">
66<tr><td><tt class="literal"><span class="pre">Seq</span></tt></td>
67<td><a class="reference" href="./forward-sequence.html">Forward Sequence</a></td>
68<td>An original sequence.</td>
69</tr>
70<tr><td><tt class="literal"><span class="pre">Pred</span></tt></td>
71<td>Unary <a class="reference" href="./lambda-expression.html">Lambda Expression</a></td>
72<td>A partitioning predicate.</td>
73</tr>
74<tr><td><tt class="literal"><span class="pre">In1</span></tt>, <tt class="literal"><span class="pre">In2</span></tt></td>
75<td><a class="reference" href="./inserter.html">Inserter</a></td>
76<td>Output inserters.</td>
77</tr>
78</tbody>
79</table>
80</div>
81<div class="section" id="id195">
82<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
83<p>The semantics of an expression are defined only
84where they differ from, or are not defined in <a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p>
85<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
86<tt class="literal"><span class="pre">in1</span></tt> and <tt class="literal"><span class="pre">in2</span></tt>:</p>
87<pre class="literal-block">
88typedef <a href="./reverse-stable-partition.html" class="identifier">reverse_stable_partition</a>&lt;s,pred,in1,in2&gt;::type r;
89</pre>
90<table class="field-list" frame="void" rules="none">
91<col class="field-name" />
92<col class="field-body" />
93<tbody valign="top">
94<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>
95</tr>
96<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
97<pre class="last literal-block">
98typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;pred&gt;::type p;
99typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;in1::operation&gt;::type in1_op;
100typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;in2::operation&gt;::type in2_op;
101
102typedef <a href="./reverse-fold.html" class="identifier">reverse_fold</a>&lt;
103      s
104    , <a href="./pair.html" class="identifier">pair</a>&lt; in1::state, in2::state &gt;
105    , <a href="./if.html" class="identifier">if_</a>&lt; 
106          <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">1</span></tt>&lt;p,_2&gt;
107        , <a href="./pair.html" class="identifier">pair</a>&lt; <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt>&lt;in1_op,first&lt;_1&gt;,_2&gt;, second&lt;_1&gt; &gt;
108        , <a href="./pair.html" class="identifier">pair</a>&lt; first&lt;_1&gt;, <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt>&lt;in2_op,second&lt;_1&gt;,_2&gt; &gt;
109        &gt;
110    &gt;::type r;
111</pre>
112</td>
113</tr>
114</tbody>
115</table>
116</div>
117<div class="section" id="id196">
118<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
119<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> 
120of summarized <tt class="literal"><span class="pre">in1::operation</span></tt> / <tt class="literal"><span class="pre">in2::operation</span></tt> applications.</p>
121</div>
122<div class="section" id="id197">
123<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
124<pre class="literal-block">
125template&lt; typename N &gt; struct is_odd : <a href="./bool.html" class="identifier">bool_</a>&lt;(N::value % 2)&gt; {};
126
127typedef <a href="./reverse-stable-partition.html" class="identifier">reverse_stable_partition</a>&lt;
128      <a href="./range-c.html" class="identifier">range_c</a>&lt;int,0,10&gt; 
129    , is_odd&lt;_1&gt;
130    , <a href="./back-inserter.html" class="identifier">back_inserter</a>&lt; <a href="./vector.html" class="identifier">vector</a>&lt;&gt; &gt;
131    , <a href="./back-inserter.html" class="identifier">back_inserter</a>&lt; <a href="./vector.html" class="identifier">vector</a>&lt;&gt; &gt;
132    &gt;::type r;
133
134<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; ));
135<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; > ));
136</pre>
137</div>
138<div class="section" id="id198">
139<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
140<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="./stable-partition.html"><tt class="refentry literal"><span class="pre">stable_partition</span></tt></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="./sort.html"><tt class="refentry literal"><span class="pre">sort</span></tt></a>, <a class="refentry reference" href="./transform.html"><tt class="refentry literal"><span class="pre">transform</span></tt></a></p>
141<!-- modtime: November 10, 2004 21:43:53 +0000 -->
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144
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