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 same_type</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.same_type_hpp" title="Header <boost/type_erasure/same_type.hpp>"> 10<link rel="prev" href="require_match.html" title="Function require_match"> 11<link rel="next" href="static_binding.html" title="Struct template static_binding"> 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="require_match.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_typeerasure/reference.html#header.boost.type_erasure.same_type_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="static_binding.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 25</div> 26<div class="refentry"> 27<a name="boost.type_erasure.same_type"></a><div class="titlepage"></div> 28<div class="refnamediv"> 29<h2><span class="refentrytitle">Struct template same_type</span></h2> 30<p>boost::type_erasure::same_type</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.same_type_hpp" title="Header <boost/type_erasure/same_type.hpp>">boost/type_erasure/same_type.hpp</a>> 34 35</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">typename</span> U<span class="special">></span> 36<span class="keyword">struct</span> <a class="link" href="same_type.html" title="Struct template same_type">same_type</a> <span class="special">{</span> 37<span class="special">}</span><span class="special">;</span></pre></div> 38<div class="refsect1"> 39<a name="id-1.3.41.13.33.3.4"></a><h2>Description</h2> 40<p>A built in concept that indicates that two types are the same. Either T or U or both can be placeholders.</p> 41<div class="warning"><table border="0" summary="Warning"> 42<tr> 43<td rowspan="2" align="center" valign="top" width="25"><img alt="[Warning]" src="../../../../doc/src/images/warning.png"></td> 44<th align="left">Warning</th> 45</tr> 46<tr><td align="left" valign="top"><p>Any number of instances of <a class="link" href="deduced.html" title="Struct template deduced">deduced</a> can be connected with <a class="link" href="same_type.html" title="Struct template same_type">same_type</a>, but there should be at most one regular placeholder in the group. same_type<_a, _b> is not allowed. The reason for this is that the library needs to normalize all the placeholders, and in this context there is no way to decide whether to use <a class="link" href="_a.html" title="Struct _a">_a</a> or <a class="link" href="_b.html" title="Struct _b">_b</a>. </p></td></tr> 47</table></div> 48<p> 49</p> 50</div> 51</div> 52<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 53<td align="left"></td> 54<td align="right"><div class="copyright-footer">Copyright © 2011-2013 Steven Watanabe<p> 55 Distributed under the Boost Software License, Version 1.0. (See accompanying 56 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>) 57 </p> 58</div></td> 59</tr></table> 60<hr> 61<div class="spirit-nav"> 62<a accesskey="p" href="require_match.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_typeerasure/reference.html#header.boost.type_erasure.same_type_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="static_binding.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 63</div> 64</body> 65</html> 66
