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>Struct template callable</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="../../boost_typeerasure/reference.html#header.boost.type_erasure.callable_hpp" title="Header <boost/type_erasure/callable.hpp>"> 10<link rel="prev" href="call.html" title="Function call"> 11<link rel="next" href="check_match.html" title="Function check_match"> 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="call.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_typeerasure/reference.html#header.boost.type_erasure.callable_hpp"><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="check_match.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 25</div> 26<div class="refentry"> 27<a name="boost.type_erasure.callable"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Struct template callable</span></h2> 30<p>boost::type_erasure::callable</p> 31</div> 32<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 33<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../boost_typeerasure/reference.html#header.boost.type_erasure.callable_hpp" title="Header <boost/type_erasure/callable.hpp>">boost/type_erasure/callable.hpp</a>> 34 35</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Sig<span class="special">,</span> <span class="keyword">typename</span> F <span class="special">=</span> <a class="link" href="_self.html" title="Struct _self">_self</a><span class="special">></span> 36<span class="keyword">struct</span> <a class="link" href="callable.html" title="Struct template callable">callable</a> <span class="special">{</span> 37 38 <span class="comment">// <a class="link" href="callable.html#id-1_3_41_13_7_1_1_1_3-bb">public static functions</a></span> 39 <span class="keyword">static</span> <span class="identifier">R</span> <a class="link" href="callable.html#id-1_3_41_13_7_1_1_1_3_1-bb"><span class="identifier">apply</span></a><span class="special">(</span><span class="identifier">F</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">T</span><span class="special">...</span><span class="special">)</span><span class="special">;</span> 40<span class="special">}</span><span class="special">;</span></pre></div> 41<div class="refsect1"> 42<a name="id-1.3.41.13.8.3.4"></a><h2>Description</h2> 43<p>The <a class="link" href="callable.html" title="Struct template callable">callable</a> concept allows an <a class="link" href="any.html" title="Class template any">any</a> to hold function objects. <code class="computeroutput">Sig</code> is interpreted in the same way as for Boost.Function, except that the arguments and return type are allowed to be placeholders. <code class="computeroutput">F</code> must be a <a class="link" href="placeholder.html" title="Struct placeholder">placeholder</a>.</p> 44<p>Multiple instances of <a class="link" href="callable.html" title="Struct template callable">callable</a> can be used simultaneously. Overload resolution works normally. Note that unlike Boost.Function, <a class="link" href="callable.html" title="Struct template callable">callable</a> does not provide result_type. It does, however, support <code class="computeroutput">boost::result_of</code>. </p> 45<div class="refsect2"> 46<a name="id-1.3.41.13.8.3.4.4"></a><h3> 47<a name="id-1_3_41_13_7_1_1_1_3-bb"></a><code class="computeroutput">callable</code> public static functions</h3> 48<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"> 49<pre class="literallayout"><span class="keyword">static</span> <span class="identifier">R</span> <a name="id-1_3_41_13_7_1_1_1_3_1-bb"></a><span class="identifier">apply</span><span class="special">(</span><span class="identifier">F</span> <span class="special">&</span> f<span class="special">,</span> <span class="identifier">T</span><span class="special">...</span> arg<span class="special">)</span><span class="special">;</span></pre> 50<p><code class="computeroutput">R</code> is the result type of <code class="computeroutput">Sig</code> and <code class="computeroutput">T</code> is the argument types of <code class="computeroutput">Sig</code>. </p> 51</li></ol></div> 52</div> 53</div> 54</div> 55<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 56<td align="left"></td> 57<td align="right"><div class="copyright-footer">Copyright © 2011-2013 Steven Watanabe<p> 58 Distributed under the Boost Software License, Version 1.0. (See accompanying 59 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>) 60 </p> 61</div></td> 62</tr></table> 63<hr> 64<div class="spirit-nav"> 65<a accesskey="p" href="call.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_typeerasure/reference.html#header.boost.type_erasure.callable_hpp"><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="check_match.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 66</div> 67</body> 68</html> 69
