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 deduced</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.deduced_hpp" title="Header <boost/type_erasure/deduced.hpp>"> 10<link rel="prev" href="constructible.html" title="Struct template constructible"> 11<link rel="next" href="derived.html" title="Struct template derived"> 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="constructible.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_typeerasure/reference.html#header.boost.type_erasure.deduced_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="derived.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 25</div> 26<div class="refentry"> 27<a name="boost.type_erasure.deduced"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Struct template deduced</span></h2> 30<p>boost::type_erasure::deduced</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.deduced_hpp" title="Header <boost/type_erasure/deduced.hpp>">boost/type_erasure/deduced.hpp</a>> 34 35</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Metafunction<span class="special">></span> 36<span class="keyword">struct</span> <a class="link" href="deduced.html" title="Struct template deduced">deduced</a> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">type_erasure</span><span class="special">::</span><span class="identifier">placeholder</span> <span class="special">{</span> 37 <span class="comment">// types</span> 38 <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> <a name="boost.type_erasure.deduced.type"></a><span class="identifier">type</span><span class="special">;</span> 39<span class="special">}</span><span class="special">;</span></pre></div> 40<div class="refsect1"> 41<a name="id-1.3.41.13.14.3.4"></a><h2>Description</h2> 42<p>A placeholder for an associated type. The type corresponding to this placeholder is deduced by substituting placeholders in the arguments of the metafunction and then evaluating it.</p> 43<p>When using <a class="link" href="deduced.html" title="Struct template deduced">deduced</a> in a template context, if it is possible for Metafunction to contain no placeholders at all, use the nested type, to automatically evaluate it early as needed. </p> 44</div> 45</div> 46<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 47<td align="left"></td> 48<td align="right"><div class="copyright-footer">Copyright © 2011-2013 Steven Watanabe<p> 49 Distributed under the Boost Software License, Version 1.0. (See accompanying 50 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>) 51 </p> 52</div></td> 53</tr></table> 54<hr> 55<div class="spirit-nav"> 56<a accesskey="p" href="constructible.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_typeerasure/reference.html#header.boost.type_erasure.deduced_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="derived.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 57</div> 58</body> 59</html> 60
