1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5<title>Concept Transform</title> 6<link rel="stylesheet" href="../../doc/src/boostbook.css" type="text/css"> 7<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 8<link rel="home" href="index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> 9<link rel="up" href="proto/reference.html" title="Reference"> 10<link rel="prev" href="PrimitiveTransform.html" title="Concept PrimitiveTransform"> 11<link rel="next" href="proto/appendices.html" title="Appendices"> 12</head> 13<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 14<table cellpadding="2" width="100%"><tr> 15<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../boost.png"></td> 16<td align="center"><a href="../../index.html">Home</a></td> 17<td align="center"><a href="../../libs/libraries.htm">Libraries</a></td> 18<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 19<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 20<td align="center"><a href="../../more/index.htm">More</a></td> 21</tr></table> 22<hr> 23<div class="spirit-nav"> 24<a accesskey="p" href="PrimitiveTransform.html"><img src="../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="proto/reference.html"><img src="../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="proto/appendices.html"><img src="../../doc/src/images/next.png" alt="Next"></a> 25</div> 26<div class="refentry"> 27<a name="Transform"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Concept Transform</span></h2> 30<p>Transform</p> 31</div> 32<div class="refsect1"> 33<a name="id-1.3.33.5.65.3"></a><h2>Description</h2> 34<p> 35 A Transform is a PrimitiveTransform, a CallableTransform 36 or an ObjectTransform. 37 </p> 38</div> 39<div class="refsect1"> 40<a name="id-1.3.33.5.65.4"></a><h2>Associated types</h2> 41<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> 42<p><span class="bold"><strong>result_type</strong></span></p> 43<pre class="literallayout">boost::result_of<when< _, Tn >(Expr, State, Data)>::type</pre> 44<p> 45 </p> 46<p>The result of applying the Transform.</p> 47<p> 48 </p> 49</li></ul></div> 50</div> 51<div class="refsect1"> 52<a name="id-1.3.33.5.65.5"></a><h2>Notation</h2> 53<div class="variablelist"><dl class="variablelist"> 54<dt><span class="term">Tn</span></dt> 55<dd>A type playing the role of transform-type in the <a class="link" href="Transform.html" title="Concept Transform">Transform</a> concept.</dd> 56<dt><span class="term">Expr</span></dt> 57<dd>A type playing the role of expression-type in the <a class="link" href="Transform.html" title="Concept Transform">Transform</a> concept.</dd> 58<dt><span class="term">State</span></dt> 59<dd>A type playing the role of state-type in the <a class="link" href="Transform.html" title="Concept Transform">Transform</a> concept.</dd> 60<dt><span class="term">Data</span></dt> 61<dd>A type playing the role of data-type in the <a class="link" href="Transform.html" title="Concept Transform">Transform</a> concept.</dd> 62<dt><span class="term"><code class="varname">expr</code></span></dt> 63<dd>Object of type Expr</dd> 64<dt><span class="term"><code class="varname">state</code></span></dt> 65<dd>Object of type State</dd> 66<dt><span class="term"><code class="varname">data</code></span></dt> 67<dd>Object of type Data</dd> 68</dl></div> 69</div> 70<div class="refsect1"> 71<a name="id-1.3.33.5.65.6"></a><h2>Valid expressions</h2> 72<div class="informaltable"><table class="table"> 73<colgroup> 74<col> 75<col> 76<col> 77<col> 78</colgroup> 79<thead><tr> 80<th>Name</th> 81<th>Expression</th> 82<th>Type</th> 83<th>Semantics</th> 84</tr></thead> 85<tbody><tr> 86<td><p>Apply Transform</p></td> 87<td><p>when< _, Tn >()(expr, state, data)</p></td> 88<td><p><span class="type">result_type</span></p></td> 89<td><p>Applies the transform.</p></td> 90</tr></tbody> 91</table></div> 92</div> 93<div class="refsect1"> 94<a name="id-1.3.33.5.65.7"></a><h2>Models</h2> 95<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><span class="simplelist"><span class="type">boost::proto::_child(boost::proto::_left)</span></span></li></ul></div> 96</div> 97</div> 98<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 99<td align="left"></td> 100<td align="right"><div class="copyright-footer">Copyright © 2008 Eric Niebler<p> 101 Distributed under the Boost Software License, Version 1.0. (See accompanying 102 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 103 </p> 104</div></td> 105</tr></table> 106<hr> 107<div class="spirit-nav"> 108<a accesskey="p" href="PrimitiveTransform.html"><img src="../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="proto/reference.html"><img src="../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="proto/appendices.html"><img src="../../doc/src/images/next.png" alt="Next"></a> 109</div> 110</body> 111</html> 112
