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_transform</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-copy-if.html" class="navigation-link">Prev</a> <a href="./reverse-replace.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./reverse-copy-if.html" class="navigation-link">Back</a> <a href="./reverse-replace.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-transform.html" class="navigation-link">reverse_transform</a></td> 13</tr></table><div class="header-separator"></div> 14<div class="section" id="reverse-transform"> 15<h1><a class="toc-backref" href="./transformation-algorithms.html#id1500">reverse_transform</a></h1> 16<div class="section" id="id740"> 17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> 18<pre class="literal-block"> 19template< 20 typename Seq 21 , typename Op 22 , typename In = <em>unspecified</em> 23 > 24struct <a href="./reverse-transform.html" class="identifier">reverse_transform</a> 25{ 26 typedef <em>unspecified</em> type; 27}; 28 29template< 30 typename Seq1 31 , typename Seq2 32 , typename BinaryOp 33 , typename In = <em>unspecified</em> 34 > 35struct <a href="./reverse-transform.html" class="identifier">reverse_transform</a> 36{ 37 typedef <em>unspecified</em> type; 38}; 39</pre> 40</div> 41<div class="section" id="id741"> 42<h3><a class="subsection-title" href="#description" name="description">Description</a></h3> 43<p><tt class="literal"><span class="pre"><a href="./reverse-transform.html" class="identifier">reverse_transform</a></span></tt> is an <a class="reference internal" href="./terminology.html#overloaded-name">overloaded name</a>:</p> 44<ul class="simple"> 45<li><tt class="literal"><span class="pre"><a href="./reverse-transform.html" class="identifier">reverse_transform</a><Seq,Op></span></tt> returns a reversed, transformed copy of the 46original sequence produced by applying an unary transformation <tt class="literal"><span class="pre">Op</span></tt> to 47every element in the [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><Sequence>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><Sequence>::type</span></tt>) range.</li> 48<li><tt class="literal"><span class="pre"><a href="./reverse-transform.html" class="identifier">reverse_transform</a><Seq1,Seq2,Op></span></tt> returns a new sequence produced by applying a 49binary transformation <tt class="literal"><span class="pre">BinaryOp</span></tt> to a pair of elements (e<sub>1</sub>, e2<sub>1</sub>) 50from the corresponding [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><Seq1>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><Seq1>::type</span></tt>) and [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><Seq2>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><Seq2>::type</span></tt>) ranges in reverse 51order.</li> 52</ul> 53<p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the 54<cite>Expression semantics</cite> subsection for a precise specification of the algorithm's 55details in all cases — <em>end note</em>]</p> 56</div> 57<div class="section" id="id742"> 58<h3><a class="subsection-title" href="#header" name="header">Header</a></h3> 59<pre class="literal-block"> 60#include <<a href="../../../../boost/mpl/transform.hpp" class="header">boost/mpl/transform.hpp</a>> 61</pre> 62</div> 63<div class="section" id="id743"> 64<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> 65<p><a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a></p> 66</div> 67<div class="section" id="id744"> 68<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> 69<table border="1" class="docutils table"> 70<colgroup> 71<col width="21%" /> 72<col width="39%" /> 73<col width="39%" /> 74</colgroup> 75<thead valign="bottom"> 76<tr><th class="head">Parameter</th> 77<th class="head">Requirement</th> 78<th class="head">Description</th> 79</tr> 80</thead> 81<tbody valign="top"> 82<tr><td><tt class="literal"><span class="pre">Sequence</span></tt>, 83<tt class="literal"><span class="pre">Seq1</span></tt>, <tt class="literal"><span class="pre">Seq2</span></tt></td> 84<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> 85<td>Sequences to transform.</td> 86</tr> 87<tr><td><tt class="literal"><span class="pre">Op</span></tt>, 88<tt class="literal"><span class="pre">BinaryOp</span></tt></td> 89<td><a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td> 90<td>A transformation.</td> 91</tr> 92<tr><td><tt class="literal"><span class="pre">In</span></tt></td> 93<td><a class="reference internal" href="./inserter.html">Inserter</a></td> 94<td>An inserter.</td> 95</tr> 96</tbody> 97</table> 98</div> 99<div class="section" id="id745"> 100<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> 101<p>The semantics of an expression are defined only 102where they differ from, or are not defined in <a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p> 103<p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>s <tt class="literal"><span class="pre">s</span></tt>, <tt class="literal"><span class="pre">s1</span></tt> and <tt class="literal"><span class="pre">s2</span></tt>, <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a>s <tt class="literal"><span class="pre">op</span></tt> and <tt class="literal"><span class="pre">op2</span></tt>, 104and an <a class="reference internal" href="./inserter.html">Inserter</a> <tt class="literal"><span class="pre">in</span></tt>:</p> 105<pre class="literal-block"> 106typedef <a href="./reverse-transform.html" class="identifier">reverse_transform</a><s,op,in>::type r; 107</pre> 108<table class="docutils field-list" frame="void" rules="none"> 109<col class="field-name" /> 110<col class="field-body" /> 111<tbody valign="top"> 112<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type.</p> 113</td> 114</tr> 115<tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first">Equivalent to</p> 116<pre class="last literal-block"> 117typedef <a href="./lambda.html" class="identifier">lambda</a><op>::type f; 118typedef <a href="./lambda.html" class="identifier">lambda</a><in::operation>::type in_op; 119 120typedef <a href="./reverse-fold.html" class="identifier">reverse_fold</a>< 121 s 122 , in::state 123 , <a href="./bind.html" class="identifier">bind</a>< in_op, <a href="./placeholders.html" class="identifier">_1</a>, <a href="./bind.html" class="identifier">bind</a><f, <a href="./placeholders.html" class="identifier">_2</a>> > 124 >::type r; 125</pre> 126</td> 127</tr> 128</tbody> 129</table> 130<pre class="literal-block"> 131typedef <a href="./transform.html" class="identifier">transform</a><s1,s2,op,in>::type r; 132</pre> 133<table class="docutils field-list" frame="void" rules="none"> 134<col class="field-name" /> 135<col class="field-body" /> 136<tbody valign="top"> 137<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type.</p> 138</td> 139</tr> 140<tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first">Equivalent to</p> 141<pre class="last literal-block"> 142typedef <a href="./lambda.html" class="identifier">lambda</a><op2>::type f; 143typedef <a href="./lambda.html" class="identifier">lambda</a><in::operation>::type in_op; 144 145typedef <a href="./reverse-fold.html" class="identifier">reverse_fold</a>< 146 pair_view<s1,s2> 147 , in::state 148 , <a href="./bind.html" class="identifier">bind</a>< 149 in_op 150 , <a href="./placeholders.html" class="identifier">_1</a> 151 , <a href="./bind.html" class="identifier">bind</a><f, <a href="./bind.html" class="identifier">bind</a><first<>,<a href="./placeholders.html" class="identifier">_2</a>>, <a href="./bind.html" class="identifier">bind</a><second<>,<a href="./placeholders.html" class="identifier">_2</a>> > 152 > 153 >::type r; 154</pre> 155</td> 156</tr> 157</tbody> 158</table> 159</div> 160<div class="section" id="id746"> 161<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> 162<p>Linear. Exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span></tt> / <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s1>::value</span></tt> applications of 163<tt class="literal"><span class="pre">op</span></tt> / <tt class="literal"><span class="pre">op2</span></tt> and <tt class="literal"><span class="pre">in::operation</span></tt>.</p> 164</div> 165<div class="section" id="id747"> 166<h3><a class="subsection-title" href="#example" name="example">Example</a></h3> 167<pre class="literal-block"> 168typedef <a href="./vector.html" class="identifier">vector</a><char,short,int,long,float,double> types; 169typedef <a href="./vector.html" class="identifier">vector</a><double*,float*,long*,int*,short*,char*> pointers; 170typedef <a href="./reverse-transform.html" class="identifier">reverse_transform</a>< types,boost::add_pointer<<a href="./placeholders.html" class="identifier">_1</a>> >::type result; 171 172<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a><result,pointers> )); 173</pre> 174</div> 175<div class="section" id="id748"> 176<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> 177<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="./transform.html">transform</a>, <a class="reference internal" href="./reverse-copy.html">reverse_copy</a>, <a class="reference internal" href="./replace-if.html">replace_if</a></p> 178<!-- Algorithms/Transformation Algorithms//reverse_replace |140 --> 179</div> 180</div> 181 182<div class="footer-separator"></div> 183<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./reverse-copy-if.html" class="navigation-link">Prev</a> <a href="./reverse-replace.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./reverse-copy-if.html" class="navigation-link">Back</a> <a href="./reverse-replace.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> 184<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> 185Distributed under the Boost Software License, Version 1.0. (See accompanying 186file 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> 187</html> 188