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 PolymorphicFunctionObject</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="ObjectTransform.html" title="Concept ObjectTransform"> 11<link rel="next" href="PrimitiveTransform.html" title="Concept PrimitiveTransform"> 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="ObjectTransform.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="PrimitiveTransform.html"><img src="../../doc/src/images/next.png" alt="Next"></a> 25</div> 26<div class="refentry"> 27<a name="PolymorphicFunctionObject"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Concept PolymorphicFunctionObject</span></h2> 30<p>PolymorphicFunctionObject</p> 31</div> 32<div class="refsect1"> 33<a name="id-1.3.33.5.63.3"></a><h2>Description</h2> 34<p> 35 A type that can be called and that follows the TR1 ResultOf 36 protocol for return type calculation. 37 </p> 38</div> 39<div class="refsect1"> 40<a name="id-1.3.33.5.63.4"></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">result_of<Fn(A0,...An)>::type</pre> 44<p> 45 </p> 46<p>The result of calling the Polymorphic Function Object.</p> 47<p> 48 </p> 49</li></ul></div> 50</div> 51<div class="refsect1"> 52<a name="id-1.3.33.5.63.5"></a><h2>Notation</h2> 53<div class="variablelist"><dl class="variablelist"> 54<dt><span class="term">Fn</span></dt> 55<dd>A type playing the role of polymorphic-function-object-type in the <a class="link" href="PolymorphicFunctionObject.html" title="Concept PolymorphicFunctionObject">PolymorphicFunctionObject</a> concept.</dd> 56<dt><span class="term"><code class="varname">fn</code></span></dt> 57<dd>Object of type Fn</dd> 58<dt><span class="term"><code class="varname">a0,...an</code></span></dt> 59<dd>Object of type A0,...An</dd> 60</dl></div> 61</div> 62<div class="refsect1"> 63<a name="id-1.3.33.5.63.6"></a><h2>Valid expressions</h2> 64<div class="informaltable"><table class="table"> 65<colgroup> 66<col> 67<col> 68<col> 69<col> 70</colgroup> 71<thead><tr> 72<th>Name</th> 73<th>Expression</th> 74<th>Type</th> 75<th>Semantics</th> 76</tr></thead> 77<tbody><tr> 78<td><p>Function Call</p></td> 79<td><p>fn(a0,...an)</p></td> 80<td><p><span class="type">result_type</span></p></td> 81<td><p>Calls the function object.</p></td> 82</tr></tbody> 83</table></div> 84</div> 85<div class="refsect1"> 86<a name="id-1.3.33.5.63.7"></a><h2>Models</h2> 87<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><span class="simplelist"><span class="type">std::plus<int></span></span></li></ul></div> 88</div> 89</div> 90<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 91<td align="left"></td> 92<td align="right"><div class="copyright-footer">Copyright © 2008 Eric Niebler<p> 93 Distributed under the Boost Software License, Version 1.0. (See accompanying 94 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>) 95 </p> 96</div></td> 97</tr></table> 98<hr> 99<div class="spirit-nav"> 100<a accesskey="p" href="ObjectTransform.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="PrimitiveTransform.html"><img src="../../doc/src/images/next.png" alt="Next"></a> 101</div> 102</body> 103</html> 104
