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: transform_view</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="./single-view.html" class="navigation-link">Prev</a> <a href="./zip-view.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./single-view.html" class="navigation-link">Back</a> <a href="./zip-view.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./views.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="./sequences.html" class="navigation-link">Sequences</a> / <a href="./views.html" class="navigation-link">Views</a> / <a href="./transform-view.html" class="navigation-link">transform_view</a></td> 13</tr></table><div class="header-separator"></div> 14<div class="section" id="transform-view"> 15<h1><a class="toc-backref" href="./views.html#id1422">transform_view</a></h1> 16<div class="section" id="id159"> 17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> 18<pre class="literal-block"> 19template< 20 typename Sequence 21 , typename F 22 > 23struct <a href="./transform-view.html" class="identifier">transform_view</a> 24{ 25 // <em>unspecified</em> 26 // <em>...</em> 27}; 28</pre> 29</div> 30<div class="section" id="id160"> 31<h3><a class="subsection-title" href="#description" name="description">Description</a></h3> 32<p>A view the full range of <tt class="literal"><span class="pre">Sequence</span></tt>'s transformed elements.</p> 33</div> 34<div class="section" id="id161"> 35<h3><a class="subsection-title" href="#header" name="header">Header</a></h3> 36<pre class="literal-block"> 37#include <<a href="../../../../boost/mpl/transform_view.hpp" class="header">boost/mpl/transform_view.hpp</a>> 38</pre> 39</div> 40<div class="section" id="id162"> 41<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3> 42<ul class="simple"> 43<li><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></li> 44</ul> 45</div> 46<div class="section" id="id163"> 47<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> 48<table border="1" class="docutils table"> 49<colgroup> 50<col width="19%" /> 51<col width="40%" /> 52<col width="40%" /> 53</colgroup> 54<thead valign="bottom"> 55<tr><th class="head">Parameter</th> 56<th class="head">Requirement</th> 57<th class="head">Description</th> 58</tr> 59</thead> 60<tbody valign="top"> 61<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td> 62<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> 63<td>A sequence to wrap.</td> 64</tr> 65<tr><td><tt class="literal"><span class="pre">F</span></tt></td> 66<td>Unary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td> 67<td>A transformation.</td> 68</tr> 69</tbody> 70</table> 71</div> 72<div class="section" id="id164"> 73<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> 74<p>The semantics of an expression are defined only 75where they differ from, or are not defined in <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>.</p> 76<p>In the following table, <tt class="literal"><span class="pre">v</span></tt> is an instance of <tt class="literal"><span class="pre"><a href="./transform-view.html" class="identifier">transform_view</a></span></tt>, <tt class="literal"><span class="pre">s</span></tt> is an arbitrary 77<a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>, and <tt class="literal"><span class="pre">f</span></tt> is an unary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a>.</p> 78<table border="1" class="docutils table"> 79<colgroup> 80<col width="37%" /> 81<col width="63%" /> 82</colgroup> 83<thead valign="bottom"> 84<tr><th class="head">Expression</th> 85<th class="head">Semantics</th> 86</tr> 87</thead> 88<tbody valign="top"> 89<tr><td><pre class="first last literal-block"> 90<a href="./transform-view.html" class="identifier">transform_view</a><s,f> 91<a href="./transform-view.html" class="identifier">transform_view</a><s,f>::type 92</pre> 93</td> 94<td>A lazy <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> such that for each <tt class="literal"><span class="pre">i</span></tt> in the 95range [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><v>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><v>::type</span></tt>) and each <tt class="literal"><span class="pre">j</span></tt> in for in the range 96[<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><s>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><s>::type</span></tt>) <tt class="literal"><span class="pre"><a href="./deref.html" class="identifier">deref</a><i>::type</span></tt> is identical to 97<tt class="literal"><span class="pre"><a href="./apply.html" class="identifier">apply</a><</span> <span class="pre">f,</span> <span class="pre"><a href="./deref.html" class="identifier">deref</a><j>::type</span> <span class="pre">>::type</span></tt>.</td> 98</tr> 99<tr><td><tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><v>::type</span></tt></td> 100<td>The size of <tt class="literal"><span class="pre">v</span></tt>; 101<tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><v>::value</span> <span class="pre">==</span> <span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span></tt>; 102linear complexity; see <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>.</td> 103</tr> 104</tbody> 105</table> 106</div> 107<div class="section" id="id165"> 108<h3><a class="subsection-title" href="#example" name="example">Example</a></h3> 109<p>Find the largest type in a sequence.</p> 110<pre class="literal-block"> 111typedef <a href="./vector.html" class="identifier">vector</a><int,long,char,char[50],double> types; 112typedef <a href="./max-element.html" class="identifier">max_element</a>< 113 <a href="./transform-view.html" class="identifier">transform_view</a>< types, size_of<_> > 114 >::type iter; 115 116<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( <a href="./deref.html" class="identifier">deref</a><iter>::type::value, ==, 50 ); 117</pre> 118</div> 119<div class="section" id="id166"> 120<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> 121<p><a class="reference internal" href="./sequences.html">Sequences</a>, <a class="reference internal" href="./views.html">Views</a>, <a class="reference internal" href="./filter-view.html">filter_view</a>, <a class="reference internal" href="./joint-view.html">joint_view</a>, <a class="reference internal" href="./zip-view.html">zip_view</a>, <a class="reference internal" href="./iterator-range.html">iterator_range</a></p> 122<!-- Sequences/Views//zip_view --> 123</div> 124</div> 125 126<div class="footer-separator"></div> 127<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./single-view.html" class="navigation-link">Prev</a> <a href="./zip-view.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./single-view.html" class="navigation-link">Back</a> <a href="./zip-view.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./views.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> 128<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> 129Distributed under the Boost Software License, Version 1.0. (See accompanying 130file 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> 131</html> 132