boost/type_traits/is_same.hpp

0001
0002 //  (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes,
0003 //      Howard Hinnant and John Maddock 2000.
0004 //  (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001
0005
0006 //  Use, modification and distribution are subject to the Boost Software License,
0007 //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
0008 //  http://www.boost.org/LICENSE_1_0.txt).
0009 //
0010 //  See http://www.boost.org/libs/type_traits for most recent version including documentation.
0011
0012 //    Fixed is_pointer, is_reference, is_const, is_volatile, is_same,
0013 //    is_member_pointer based on the Simulated Partial Specialization work
0014 //    of Mat Marcus and Jesse Jones. See  http://opensource.adobe.com or
0015 //    http://groups.yahoo.com/group/boost/message/5441
0016 //    Some workarounds in here use ideas suggested from "Generic<Programming>:
0017 //    Mappings between Types and Values"
0018 //    by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html).
0019
0020
0021 #ifndef BOOST_TT_IS_SAME_HPP_INCLUDED
0022 #define BOOST_TT_IS_SAME_HPP_INCLUDED
0023
0024 #include <boost/type_traits/integral_constant.hpp>
0025
0026 namespace boost {
0027
0028
0029    template <class T, class U> struct is_same : public false_type {};
0030    template <class T> struct is_same<T,T> : public true_type {};
0031 #if BOOST_WORKAROUND(BOOST_BORLANDC, < 0x600)
0032 // without this, Borland's compiler gives the wrong answer for
0033 // references to arrays:
0034    template <class T> struct is_same<T&, T&> : public true_type{};
0035 #endif
0036
0037
0038 } // namespace boost
0039
0040 #endif  // BOOST_TT_IS_SAME_HPP_INCLUDED
0041