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>Function typeid_of</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.typeid_of_hpp" title="Header <boost/type_erasure/typeid_of.hpp>"> 10<link rel="prev" href="get.html" title="Function get"> 11<link rel="next" href="../../boost_typeerasure/rationale.html" title="Rationale"> 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" 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name="boost.type_erasure.typeid_of"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Function typeid_of</span></h2> 30<p>boost::type_erasure::typeid_of</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.typeid_of_hpp" title="Header <boost/type_erasure/typeid_of.hpp>">boost/type_erasure/typeid_of.hpp</a>> 34 35</span> 36<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Concept<span class="special">,</span> <span class="keyword">typename</span> T<span class="special">></span> 37 <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span> <span class="special">&</span> <span class="identifier">typeid_of</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="../any.html" title="Class any">any</a><span class="special"><</span> <span class="identifier">Concept</span><span class="special">,</span> <span class="identifier">T</span> <span class="special">></span> <span class="special">&</span> arg<span class="special">)</span><span class="special">;</span> 38<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> Concept<span class="special">></span> 39 <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">type_info</span> <span class="special">&</span> <span class="identifier">typeid_of</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="binding.html" title="Class template binding">binding</a><span class="special"><</span> <span class="identifier">Concept</span> <span class="special">></span> <span class="special">&</span> binding<span class="special">)</span><span class="special">;</span></pre></div> 40<div class="refsect1"> 41<a name="id-1.3.41.13.36.3.4"></a><h2>Description</h2> 42<p>The first form returns the type currently stored in an <code class="computeroutput"><a class="link" href="any.html" title="Class template any">any</a></code>.</p> 43<p>The second form returns the type corresponding to a placeholder in <code class="computeroutput">binding</code>.</p> 44<p> 45 46</p> 47<div class="variablelist"><table border="0" class="variablelist compact"> 48<colgroup> 49<col align="left" valign="top"> 50<col> 51</colgroup> 52<tbody> 53<tr> 54<td><p><span class="term">Requires:</span></p></td> 55<td><p><code class="computeroutput">Concept</code> includes <a class="link" href="typeid_.html" title="Struct template typeid_">typeid_<T></a>. </p></td> 56</tr> 57<tr> 58<td><p><span class="term">Requires:</span></p></td> 59<td><p><code class="computeroutput">T</code> is a non-reference, CV-unqualified <a class="link" href="placeholder.html" title="Struct placeholder">placeholder</a>. </p></td> 60</tr> 61</tbody> 62</table></div> 63</div> 64</div> 65<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 66<td align="left"></td> 67<td align="right"><div class="copyright-footer">Copyright © 2011-2013 Steven Watanabe<p> 68 Distributed under the Boost Software License, Version 1.0. (See accompanying 69 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>) 70 </p> 71</div></td> 72</tr></table> 73<hr> 74<div class="spirit-nav"> 75<a accesskey="p" href="get.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_typeerasure/reference.html#header.boost.type_erasure.typeid_of_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="../../boost_typeerasure/rationale.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 76</div> 77</body> 78</html> 79
