<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Deferred Callable Object</title> <link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.75.2"> <link rel="home" href="../../../index.html" title="Chapter 1. Fusion 2.0"> <link rel="up" href="../concepts.html" title="Concepts"> <link rel="prev" href="reg_callable.html" title="Regular Callable Object"> <link rel="next" href="poly.html" title="Polymorphic Function Object"> </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 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name="fusion.functional.concepts.def_callable.description"></a><h6> <a name="id1106043"></a> <a class="link" href="def_callable.html#fusion.functional.concepts.def_callable.description">Description</a> </h6> <p> <a class="link" href="callable.html" title="Callable Object">Callable Object</a> types that work with <a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top">Boost.ResultOf</a> to determine the result of a call. </p> <a name="fusion.functional.concepts.def_callable.refinement_of"></a><h6> <a name="id1106069"></a> <a class="link" href="def_callable.html#fusion.functional.concepts.def_callable.refinement_of">Refinement of</a> </h6> <div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"> <a class="link" href="callable.html" title="Callable Object">Callable Object</a> </li></ul></div> <div class="sidebar"> <p class="title"><b></b></p> <p> note Once C++ supports the <code class="literal">decltype</code> keyword, all models of <a class="link" href="callable.html" title="Callable Object">Callable Object</a> will also be models of <a class="link" href="def_callable.html" title="Deferred Callable Object">Deferred Callable Object</a>, because function objects won't need client-side support for <code class="computeroutput"><span class="identifier">result_of</span></code>. </p> </div> <div class="variablelist"> <p class="title"><b>Notation</b></p> <dl> <dt><span class="term"><code class="computeroutput"><span class="identifier">F</span></code></span></dt> <dd><p> A possibly const qualified Deferred Callable Object type </p></dd> <dt><span class="term"><code class="computeroutput"><span class="identifier">A1</span> <span class="special">...</span><span class="identifier">AN</span></code></span></dt> <dd><p> Argument types </p></dd> <dt><span class="term"><code class="computeroutput"><span class="identifier">a1</span> <span class="special">...</span><span class="identifier">aN</span></code></span></dt> <dd><p> Objects or references to objects with types <code class="computeroutput"><span class="identifier">A1</span> <span class="special">...</span><span class="identifier">AN</span></code> </p></dd> <dt><span class="term"><code class="computeroutput"><span class="identifier">T1</span> <span class="special">...</span><span class="identifier">TN</span></code></span></dt> <dd><p> <code class="computeroutput"><span class="identifier">T</span></code>i is <code class="computeroutput"><span class="identifier">A</span></code>i <code class="computeroutput"><span class="special">&</span></code> if <code class="computeroutput"><span class="identifier">a</span></code>i is an LValue, same as <code class="computeroutput"><span class="identifier">A</span></code>i, otherwise </p></dd> </dl> </div> <a name="fusion.functional.concepts.def_callable.expression_requirements"></a><h6> <a name="id1106292"></a> <a class="link" href="def_callable.html#fusion.functional.concepts.def_callable.expression_requirements">Expression requirements</a> </h6> <div class="informaltable"><table class="table"> <colgroup> <col> <col> </colgroup> <thead><tr> <th> <p> Expression </p> </th> <th> <p> Type </p> </th> </tr></thead> <tbody><tr> <td> <p> <a href="http://www.boost.org/libs/utility/utility.htm#result_of" target="_top"><code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span></code></a><code class="computeroutput"><span class="special"><</span> <span class="identifier">F</span><span class="special">(</span><span class="identifier">T1</span> <span class="special">...</span><span class="identifier">TN</span><span class="special">)</span> <span class="special">>::</span><span class="identifier">type</span></code> </p> </td> <td> <p> Result of a call with <code class="computeroutput"><span class="identifier">A1</span> <span class="special">...</span><span class="identifier">AN</span></code>-typed arguments </p> </td> </tr></tbody> </table></div> <a name="fusion.functional.concepts.def_callable.models"></a><h6> <a name="id1106431"></a> <a class="link" href="def_callable.html#fusion.functional.concepts.def_callable.models">Models</a> </h6> <div class="itemizedlist"><ul class="itemizedlist" type="disc"> <li class="listitem"> <a class="link" href="poly.html" title="Polymorphic Function Object">Polymorphic Function Object</a> types </li> <li class="listitem"> member (function or data) pointer types </li> </ul></div> <a name="fusion.functional.concepts.def_callable.examples"></a><h6> <a name="id1106467"></a> <a class="link" href="def_callable.html#fusion.functional.concepts.def_callable.examples">Examples</a> </h6> <pre class="programlisting"><span class="special">&</span> <span class="identifier">a_free_function</span> <span class="special">&</span> <span class="identifier">a_class</span><span class="special">::</span><span class="identifier">a_static_member_function</span> <span class="special">&</span> <span class="identifier">a_class</span><span class="special">::</span><span class="identifier">a_nonstatic_data_member</span> <span class="special">&</span> <span class="identifier">a_class</span><span class="special">::</span><span class="identifier">a_nonstatic_member_function</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special"><</span><span class="keyword">int</span><span class="special">>()</span> <span class="comment">// using namespace boost; </span><span class="identifier">bind</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special"><</span><span class="keyword">int</span><span class="special">>(),</span> <span class="identifier">_1</span><span class="special">,</span> <span class="number">5</span><span class="special">)</span> <span class="comment">// Note: Boost.Lambda expressions don't work with __boost_result_of__ </span><span class="identifier">fusion</span><span class="special">::</span><a class="link" href="../generation/functions/mk_fused_fobj.html" title="make_fused_function_object"><code class="computeroutput"><span class="identifier">make_fused_function_object</span></code></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">less</span><span class="special"><</span><span class="keyword">int</span><span class="special">>())</span> </pre> </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 © 2001-2007 Joel de Guzman, Dan Marsden, Tobias Schwinger<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="reg_callable.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../concepts.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="poly.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>