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: reverse_unique</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="./reverse-remove-if.html" class="navigation-link">Prev</a> <a href="./reverse-partition.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./reverse-remove-if.html" class="navigation-link">Back</a> <a href="./reverse-partition.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="./reverse-unique.html" class="navigation-link">reverse_unique</a></td> 13</tr></table><div class="header-separator"></div> 14<div class="section" id="reverse-unique"> 15<h1><a class="toc-backref" href="./transformation-algorithms.html#id1505">reverse_unique</a></h1> 16<div class="section" id="id785"> 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 In = <em>unspecified</em> 23 > 24struct <a href="./reverse-unique.html" class="identifier">reverse_unique</a> 25{ 26 typedef <em>unspecified</em> type; 27}; 28</pre> 29</div> 30<div class="section" id="id786"> 31<h3><a class="subsection-title" href="#description" name="description">Description</a></h3> 32<p>Returns a sequence of the initial elements of every subrange of the 33reversed original sequence <tt class="literal"><span class="pre">Seq</span></tt> whose elements are all the same.</p> 34<p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the 35<cite>Expression semantics</cite> subsection for a precise specification of the algorithm's 36details in all cases — <em>end note</em>]</p> 37</div> 38<div class="section" id="id787"> 39<h3><a class="subsection-title" href="#header" name="header">Header</a></h3> 40<pre class="literal-block"> 41#include <<a href="../../../../boost/mpl/unique.hpp" class="header">boost/mpl/unique.hpp</a>> 42</pre> 43</div> 44<div class="section" id="id788"> 45<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> 46<p><a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a></p> 47</div> 48<div class="section" id="id789"> 49<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> 50<table border="1" class="docutils table"> 51<colgroup> 52<col width="19%" /> 53<col width="43%" /> 54<col width="38%" /> 55</colgroup> 56<thead valign="bottom"> 57<tr><th class="head">Parameter</th> 58<th class="head">Requirement</th> 59<th class="head">Description</th> 60</tr> 61</thead> 62<tbody valign="top"> 63<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td> 64<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> 65<td>An original sequence.</td> 66</tr> 67<tr><td><tt class="literal"><span class="pre">Pred</span></tt></td> 68<td>Binary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td> 69<td>An equivalence relation.</td> 70</tr> 71<tr><td><tt class="literal"><span class="pre">In</span></tt></td> 72<td><a class="reference internal" href="./inserter.html">Inserter</a></td> 73<td>An inserter.</td> 74</tr> 75</tbody> 76</table> 77</div> 78<div class="section" id="id790"> 79<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> 80<p>The semantics of an expression are defined only 81where they differ from, or are not defined in <a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p> 82<p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, a binary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">pred</span></tt>, 83and an <a class="reference internal" href="./inserter.html">Inserter</a> <tt class="literal"><span class="pre">in</span></tt>:</p> 84<pre class="literal-block"> 85typedef <a href="./reverse-unique.html" class="identifier">reverse_unique</a><s,pred,in>::type r; 86</pre> 87<table class="docutils field-list" frame="void" rules="none"> 88<col class="field-name" /> 89<col class="field-body" /> 90<tbody valign="top"> 91<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type.</p> 92</td> 93</tr> 94<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">If <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span> <span class="pre"><=</span> <span class="pre">1</span></tt>, then equivalent to</p> 95<pre class="literal-block"> 96typedef <a href="./reverse-copy.html" class="identifier">reverse_copy</a><s,in>::type r; 97</pre> 98<p>otherwise equivalent to</p> 99<pre class="last literal-block"> 100typedef <a href="./lambda.html" class="identifier">lambda</a><pred>::type p; 101typedef <a href="./lambda.html" class="identifier">lambda</a><in::operation>::type in_op; 102typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt>< 103 in_op 104 , in::state 105 , <a href="./front.html" class="identifier">front</a><types>::type 106 >::type in_state; 107 108typedef <a href="./reverse-fold.html" class="identifier">reverse_fold</a>< 109 s 110 , <a href="./pair.html" class="identifier">pair</a>< in_state, <a href="./front.html" class="identifier">front</a><s>::type > 111 , <a href="./eval-if.html" class="identifier">eval_if</a>< 112 <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt><p, second<<a href="./placeholders.html" class="identifier">_1</a>>, <a href="./placeholders.html" class="identifier">_2</a>> 113 , <a href="./identity.html" class="identifier">identity</a>< first<<a href="./placeholders.html" class="identifier">_1</a>> > 114 , <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt><in_op, first<<a href="./placeholders.html" class="identifier">_1</a>>, <a href="./placeholders.html" class="identifier">_2</a>> 115 > 116 >::type::first r; 117</pre> 118</td> 119</tr> 120</tbody> 121</table> 122</div> 123<div class="section" id="id791"> 124<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> 125<p>Linear. Performs exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span> <span class="pre">-</span> <span class="pre">1</span></tt> applications of <tt class="literal"><span class="pre">pred</span></tt>, and at 126most <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span></tt> insertions.</p> 127</div> 128<div class="section" id="id792"> 129<h3><a class="subsection-title" href="#example" name="example">Example</a></h3> 130<pre class="literal-block"> 131typedef <a href="./vector.html" class="identifier">vector</a><int,float,float,char,int,int,int,double> types; 132typedef <a href="./vector.html" class="identifier">vector</a><double,int,char,float,int> expected; 133typedef <a href="./reverse-unique.html" class="identifier">reverse_unique</a>< types, is_same<<a href="./placeholders.html" class="identifier">_1</a>,<a href="./placeholders.html" class="identifier">_2</a>> >::type result; 134 135<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>< result,expected > )); 136</pre> 137</div> 138<div class="section" id="id793"> 139<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> 140<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="./unique.html">unique</a>, <a class="reference internal" href="./reverse-remove.html">reverse_remove</a>, 141<a class="reference internal" href="./reverse-copy-if.html">reverse_copy_if</a>, <a class="reference internal" href="./replace-if.html">replace_if</a></p> 142<!-- Algorithms/Transformation Algorithms//reverse_partition |185 --> 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="./reverse-remove-if.html" class="navigation-link">Prev</a> <a href="./reverse-partition.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./reverse-remove-if.html" class="navigation-link">Back</a> <a href="./reverse-partition.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