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10<title>The MPL Reference Manual: reverse_stable_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="./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>
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="./reverse-stable-partition.html" class="navigation-link">reverse_stable_partition</a></td>
16</tr></table><div class="header-separator"></div>
17<div class="section" id="reverse-stable-partition">
18<h1><a class="toc-backref" href="./transformation-algorithms.html#id435" name="reverse-stable-partition">reverse_stable_partition</a></h1>
19<div class="section" id="id190">
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="./reverse-stable-partition.html" class="identifier">reverse_stable_partition</a>
29{
30    typedef <em>unspecified</em> type;
31};
32</pre>
33</div>
34<div class="section" id="id191">
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="./reverse-stable-partition.html" class="identifier">reverse_stable_partition</a></span></tt> is guaranteed to preserve the reversed
39relative order of the elements in the resulting sequences.</p>
40<p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the
41<cite>Expression semantics</cite> subsection for a precise specification of the algorithm's
42details in all cases — <em>end note</em>]</p>
43</div>
44<div class="section" id="id192">
45<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
46<pre class="literal-block">
47#include &lt;<a href="../../../../boost/mpl/stable_partition.hpp" class="header">boost/mpl/stable_partition.hpp</a>&gt;
48</pre>
49</div>
50<div class="section" id="id193">
51<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
52<p><a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a></p>
53</div>
54<div class="section" id="id194">
55<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
56<table border="1" class="table">
57<colgroup>
58<col width="22%" />
59<col width="41%" />
60<col width="36%" />
61</colgroup>
62<thead valign="bottom">
63<tr><th>Parameter</th>
64<th>Requirement</th>
65<th>Description</th>
66</tr>
67</thead>
68<tbody valign="top">
69<tr><td><tt class="literal"><span class="pre">Seq</span></tt></td>
70<td><a class="reference" href="./forward-sequence.html">Forward Sequence</a></td>
71<td>An original sequence.</td>
72</tr>
73<tr><td><tt class="literal"><span class="pre">Pred</span></tt></td>
74<td>Unary <a class="reference" href="./lambda-expression.html">Lambda Expression</a></td>
75<td>A partitioning predicate.</td>
76</tr>
77<tr><td><tt class="literal"><span class="pre">In1</span></tt>, <tt class="literal"><span class="pre">In2</span></tt></td>
78<td><a class="reference" href="./inserter.html">Inserter</a></td>
79<td>Output inserters.</td>
80</tr>
81</tbody>
82</table>
83</div>
84<div class="section" id="id195">
85<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
86<p>The semantics of an expression are defined only
87where they differ from, or are not defined in <a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p>
88<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
89<tt class="literal"><span class="pre">in1</span></tt> and <tt class="literal"><span class="pre">in2</span></tt>:</p>
90<pre class="literal-block">
91typedef <a href="./reverse-stable-partition.html" class="identifier">reverse_stable_partition</a>&lt;s,pred,in1,in2&gt;::type r;
92</pre>
93<table class="field-list" frame="void" rules="none">
94<col class="field-name" />
95<col class="field-body" />
96<tbody valign="top">
97<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>
98</tr>
99<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
100<pre class="last literal-block">
101typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;pred&gt;::type p;
102typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;in1::operation&gt;::type in1_op;
103typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;in2::operation&gt;::type in2_op;
104
105typedef <a href="./reverse-fold.html" class="identifier">reverse_fold</a>&lt;
106      s
107    , <a href="./pair.html" class="identifier">pair</a>&lt; in1::state, in2::state &gt;
108    , <a href="./if.html" class="identifier">if_</a>&lt; 
109          <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">1</span></tt>&lt;p,_2&gt;
110        , <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;
111        , <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;
112        &gt;
113    &gt;::type r;
114</pre>
115</td>
116</tr>
117</tbody>
118</table>
119</div>
120<div class="section" id="id196">
121<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
122<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> 
123of summarized <tt class="literal"><span class="pre">in1::operation</span></tt> / <tt class="literal"><span class="pre">in2::operation</span></tt> applications.</p>
124</div>
125<div class="section" id="id197">
126<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
127<pre class="literal-block">
128template&lt; typename N &gt; struct is_odd : <a href="./bool.html" class="identifier">bool_</a>&lt;(N::value % 2)&gt; {};
129
130typedef <a href="./reverse-stable-partition.html" class="identifier">reverse_stable_partition</a>&lt;
131      <a href="./range-c.html" class="identifier">range_c</a>&lt;int,0,10&gt; 
132    , is_odd&lt;_1&gt;
133    , <a href="./back-inserter.html" class="identifier">back_inserter</a>&lt; <a href="./vector.html" class="identifier">vector</a>&lt;&gt; &gt;
134    , <a href="./back-inserter.html" class="identifier">back_inserter</a>&lt; <a href="./vector.html" class="identifier">vector</a>&lt;&gt; &gt;
135    &gt;::type r;
136
137<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; ));
138<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; > ));
139</pre>
140</div>
141<div class="section" id="id198">
142<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
143<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>
144<!-- modtime: November 10, 2004 21:43:53 +0000 -->
145</div>
146</div>
147
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