<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Concept PolymorphicFunctionObject</title> <link rel="stylesheet" href="../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <link rel="home" href="index.html" title="The Boost C++ Libraries BoostBook Documentation Subset"> <link rel="up" href="proto/reference.html" title="Reference"> <link rel="prev" href="ObjectTransform.html" title="Concept ObjectTransform"> <link rel="next" href="PrimitiveTransform.html" title="Concept PrimitiveTransform"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../boost.png"></td> <td align="center"><a href="../../index.html">Home</a></td> <td align="center"><a href="../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <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> </div> <div class="refentry"> <a name="PolymorphicFunctionObject"></a><div class="titlepage"></div> <div class="refnamediv"> <h2><span class="refentrytitle">Concept PolymorphicFunctionObject</span></h2> <p>PolymorphicFunctionObject</p> </div> <div class="refsect1"> <a name="idm45555167948144"></a><h2>Description</h2> <p> A type that can be called and that follows the TR1 ResultOf protocol for return type calculation. </p> </div> <div class="refsect1"> <a name="idm45555167947088"></a><h2>Associated types</h2> <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> <p><span class="bold"><strong>result_type</strong></span></p> <pre class="literallayout">result_of<Fn(A0,...An)>::type</pre> <p> </p> <p>The result of calling the Polymorphic Function Object.</p> <p> </p> </li></ul></div> </div> <div class="refsect1"> <a name="idm45555167944272"></a><h2>Notation</h2> <div class="variablelist"><dl class="variablelist"> <dt><span class="term">Fn</span></dt> <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> <dt><span class="term"><code class="varname">fn</code></span></dt> <dd>Object of type Fn</dd> <dt><span class="term"><code class="varname">a0,...an</code></span></dt> <dd>Object of type A0,...An</dd> </dl></div> </div> <div class="refsect1"> <a name="idm45555167940112"></a><h2>Valid expressions</h2> <div class="informaltable"><table class="table"> <colgroup> <col> <col> <col> <col> </colgroup> <thead><tr> <th>Name</th> <th>Expression</th> <th>Type</th> <th>Semantics</th> </tr></thead> <tbody><tr> <td><p>Function Call</p></td> <td><p>fn(a0,...an)</p></td> <td><p><span class="type">result_type</span></p></td> <td><p>Calls the function object.</p></td> </tr></tbody> </table></div> </div> <div class="refsect1"> <a name="idm45555167935728"></a><h2>Models</h2> <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> </div> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2008 Eric Niebler<p> Distributed under the Boost Software License, Version 1.0. (See accompanying 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>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <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> </div> </body> </html>