1<?xml version="1.0" encoding="utf-8" ?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> 4<head> 5<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 6<meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" /> 7<title>The MPL Reference Manual: stable_partition</title> 8<link rel="stylesheet" href="../style.css" type="text/css" /> 9</head> 10<body class="docframe refmanual"> 11<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./partition.html" class="navigation-link">Prev</a> <a href="./sort.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./partition.html" class="navigation-link">Back</a> <a href="./sort.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./transformation-algorithms.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </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="./stable-partition.html" class="navigation-link">stable_partition</a></td> 13</tr></table><div class="header-separator"></div> 14<div class="section" id="stable-partition"> 15<h1><a class="toc-backref" href="./transformation-algorithms.html#id1495">stable_partition</a></h1> 16<div class="section" id="id696"> 17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> 18<pre class="literal-block"> 19template< 20 typename Seq 21 , typename Pred 22 , typename In1 = <em>unspecified</em> 23 , typename In2 = <em>unspecified</em> 24 > 25struct <a href="./stable-partition.html" class="identifier">stable_partition</a> 26{ 27 typedef <em>unspecified</em> type; 28}; 29</pre> 30</div> 31<div class="section" id="id697"> 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><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>. 35<tt class="literal"><span class="pre"><a href="./stable-partition.html" class="identifier">stable_partition</a></span></tt> is guaranteed to preserve the relative order of the 36elements 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="id698"> 42<h3><a class="subsection-title" href="#header" name="header">Header</a></h3> 43<pre class="literal-block"> 44#include <<a href="../../../../boost/mpl/stable_partition.hpp" class="header">boost/mpl/stable_partition.hpp</a>> 45</pre> 46</div> 47<div class="section" id="id699"> 48<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> 49<p><a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a></p> 50</div> 51<div class="section" id="id700"> 52<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> 53<table border="1" class="docutils table"> 54<colgroup> 55<col width="22%" /> 56<col width="41%" /> 57<col width="36%" /> 58</colgroup> 59<thead valign="bottom"> 60<tr><th class="head">Parameter</th> 61<th class="head">Requirement</th> 62<th class="head">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 internal" 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 internal" 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 internal" href="./inserter.html">Inserter</a></td> 76<td>Output inserters.</td> 77</tr> 78</tbody> 79</table> 80</div> 81<div class="section" id="id701"> 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 internal" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p> 85<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 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="./stable-partition.html" class="identifier">stable_partition</a><s,pred,in1,in2>::type r; 89</pre> 90<table class="docutils 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"><p class="first">A <a class="reference internal" href="./pair.html">pair</a>.</p> 95</td> 96</tr> 97<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> 98<pre class="last literal-block"> 99typedef <a href="./lambda.html" class="identifier">lambda</a><pred>::type p; 100typedef <a href="./lambda.html" class="identifier">lambda</a><in1::operation>::type in1_op; 101typedef <a href="./lambda.html" class="identifier">lambda</a><in2::operation>::type in2_op; 102 103typedef <a href="./fold.html" class="identifier">fold</a>< 104 s 105 , <a href="./pair.html" class="identifier">pair</a>< in1::state, in2::state > 106 , <a href="./if.html" class="identifier">if_</a>< 107 <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">1</span></tt><p,<a href="./placeholders.html" class="identifier">_2</a>> 108 , <a href="./pair.html" class="identifier">pair</a>< <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt><in1_op,first<<a href="./placeholders.html" class="identifier">_1</a>>,<a href="./placeholders.html" class="identifier">_2</a>>, second<<a href="./placeholders.html" class="identifier">_1</a>> > 109 , <a href="./pair.html" class="identifier">pair</a>< first<<a href="./placeholders.html" class="identifier">_1</a>>, <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt><in2_op,second<<a href="./placeholders.html" class="identifier">_1</a>>,<a href="./placeholders.html" class="identifier">_2</a>> > 110 > 111 >::type r; 112</pre> 113</td> 114</tr> 115</tbody> 116</table> 117</div> 118<div class="section" id="id702"> 119<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> 120<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> 121of summarized <tt class="literal"><span class="pre">in1::operation</span></tt> / <tt class="literal"><span class="pre">in2::operation</span></tt> applications.</p> 122</div> 123<div class="section" id="id703"> 124<h3><a class="subsection-title" href="#example" name="example">Example</a></h3> 125<pre class="literal-block"> 126template< typename N > struct is_odd : <a href="./bool.html" class="identifier">bool_</a><(N::value % 2)> {}; 127 128typedef <a href="./stable-partition.html" class="identifier">stable_partition</a>< 129 <a href="./range-c.html" class="identifier">range_c</a><int,0,10> 130 , is_odd<<a href="./placeholders.html" class="identifier">_1</a>> 131 , <a href="./back-inserter.html" class="identifier">back_inserter</a>< <a href="./vector.html" class="identifier">vector</a><> > 132 , <a href="./back-inserter.html" class="identifier">back_inserter</a>< <a href="./vector.html" class="identifier">vector</a><> > 133 >::type r; 134 135<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> > )); 136<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> > )); 137</pre> 138</div> 139<div class="section" id="id704"> 140<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> 141<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-stable-partition.html">reverse_stable_partition</a>, <a class="reference internal" href="./partition.html">partition</a>, <a class="reference internal" href="./sort.html">sort</a>, <a class="reference internal" href="./transform.html">transform</a></p> 142<!-- Algorithms/Transformation Algorithms//sort |95 --> 143</div> 144</div> 145 146<div class="footer-separator"></div> 147<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./partition.html" class="navigation-link">Prev</a> <a href="./sort.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./partition.html" class="navigation-link">Back</a> <a href="./sort.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./transformation-algorithms.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> 148<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> 149Distributed under the Boost Software License, Version 1.0. (See accompanying 150file LICENSE_1_0.txt or copy at <a class="reference external" href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</div></td></tr></table></body> 151</html> 152