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 PrimitiveTransform</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="PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject"> 11<link rel="next" href="Transform.html" title="Concept Transform"> 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="PolymorphicFunctionObject.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="Transform.html"><img src="../../doc/src/images/next.png" alt="Next"></a> 25</div> 26<div class="refentry"> 27<a name="PrimitiveTransform"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Concept PrimitiveTransform</span></h2> 30<p>PrimitiveTransform</p> 31</div> 32<div class="refsect1"> 33<a name="id-1.3.33.5.64.3"></a><h2>Description</h2> 34<p> 35 A PrimitiveTransform is a class type that 36 has a nested class template called 37 <code class="computeroutput">impl<></code> that takes 38 three template parameters representing an expression 39 type, a state type and a data type. Specializations 40 of the nested impl template are ternary monomorphic 41 function objects that accept expression, state, and 42 data parameters. A PrimitiveTransform is also a 43 <a class="link" href="PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> 44 implemented in terms of the nested 45 <code class="computeroutput">impl<></code> template. 46 </p> 47</div> 48<div class="refsect1"> 49<a name="id-1.3.33.5.64.4"></a><h2>Associated types</h2> 50<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> 51<p><span class="bold"><strong>result_type</strong></span></p> 52<pre class="literallayout">typename Fn::template impl<Expr, State, Data>::result_type</pre> 53<p> 54 </p> 55<p>The return type of the overloaded function call operator.</p> 56<p> 57 </p> 58</li></ul></div> 59</div> 60<div class="refsect1"> 61<a name="id-1.3.33.5.64.5"></a><h2>Notation</h2> 62<div class="variablelist"><dl class="variablelist"> 63<dt><span class="term">Fn</span></dt> 64<dd>A type playing the role of primitive-transform-type in the <a class="link" href="PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a> concept.</dd> 65<dt><span class="term">Expr</span></dt> 66<dd>A type playing the role of expression-type in the <a class="link" href="PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a> concept.</dd> 67<dt><span class="term">State</span></dt> 68<dd>A type playing the role of state-type in the <a class="link" href="PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a> concept.</dd> 69<dt><span class="term">Data</span></dt> 70<dd>A type playing the role of data-type in the <a class="link" href="PrimitiveTransform.html" title="Concept PrimitiveTransform">PrimitiveTransform</a> concept.</dd> 71<dt><span class="term"><code class="varname">fn</code></span></dt> 72<dd>Object of type Fn</dd> 73<dt><span class="term"><code class="varname">expr</code></span></dt> 74<dd>Object of type Expr</dd> 75<dt><span class="term"><code class="varname">state</code></span></dt> 76<dd>Object of type State</dd> 77<dt><span class="term"><code class="varname">data</code></span></dt> 78<dd>Object of type Data</dd> 79</dl></div> 80</div> 81<div class="refsect1"> 82<a name="id-1.3.33.5.64.6"></a><h2>Valid expressions</h2> 83<div class="informaltable"><table class="table"> 84<colgroup> 85<col> 86<col> 87<col> 88<col> 89</colgroup> 90<thead><tr> 91<th>Name</th> 92<th>Expression</th> 93<th>Type</th> 94<th>Semantics</th> 95</tr></thead> 96<tbody> 97<tr> 98<td><p>Polymorphic Function Call 1</p></td> 99<td><p>fn(expr)</p></td> 100<td><p><span class="type">result_type</span></p></td> 101<td><p>Applies the transform.</p></td> 102</tr> 103<tr> 104<td><p>Polymorphic Function Call 2</p></td> 105<td><p>fn(expr, state)</p></td> 106<td><p><span class="type">result_type</span></p></td> 107<td><p>Applies the transform.</p></td> 108</tr> 109<tr> 110<td><p>Polymorphic Function Call 3</p></td> 111<td><p>fn(expr, state, data)</p></td> 112<td><p><span class="type">result_type</span></p></td> 113<td><p>Applies the transform.</p></td> 114</tr> 115<tr> 116<td><p>Monomorphic Function Call</p></td> 117<td><p>typename Fn::template impl< Expr, State, Data >()(expr, state, data)</p></td> 118<td><p><span class="type">result_type</span></p></td> 119<td><p>Applies the transform.</p></td> 120</tr> 121</tbody> 122</table></div> 123</div> 124<div class="refsect1"> 125<a name="id-1.3.33.5.64.7"></a><h2>Models</h2> 126<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><span class="simplelist"><span class="type">boost::proto::_child_c< 0 ></span></span></li></ul></div> 127</div> 128</div> 129<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 130<td align="left"></td> 131<td align="right"><div class="copyright-footer">Copyright © 2008 Eric Niebler<p> 132 Distributed under the Boost Software License, Version 1.0. (See accompanying 133 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>) 134 </p> 135</div></td> 136</tr></table> 137<hr> 138<div class="spirit-nav"> 139<a accesskey="p" href="PolymorphicFunctionObject.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="Transform.html"><img src="../../doc/src/images/next.png" alt="Next"></a> 140</div> 141</body> 142</html> 143
