1 2 // (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, 3 // Howard Hinnant and John Maddock 2000. 4 // (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001 5 6 // Use, modification and distribution are subject to the Boost Software License, 7 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at 8 // http://www.boost.org/LICENSE_1_0.txt). 9 // 10 // See http://www.boost.org/libs/type_traits for most recent version including documentation. 11 12 // Fixed is_pointer, is_reference, is_const, is_volatile, is_same, 13 // is_member_pointer based on the Simulated Partial Specialization work 14 // of Mat Marcus and Jesse Jones. See http://opensource.adobe.com or 15 // http://groups.yahoo.com/group/boost/message/5441 16 // Some workarounds in here use ideas suggested from "Generic<Programming>: 17 // Mappings between Types and Values" 18 // by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html). 19 20 21 #ifndef BOOST_TT_IS_SAME_HPP_INCLUDED 22 #define BOOST_TT_IS_SAME_HPP_INCLUDED 23 24 #include <boost/type_traits/integral_constant.hpp> 25 26 namespace boost { 27 28 29 template <class T, class U> struct is_same : public false_type {}; 30 template <class T> struct is_same<T,T> : public true_type {}; 31 #if BOOST_WORKAROUND(__BORLANDC__, < 0x600) 32 // without this, Borland's compiler gives the wrong answer for 33 // references to arrays: 34 template <class T> struct is_same<T&, T&> : public true_type{}; 35 #endif 36 37 38 } // namespace boost 39 40 #endif // BOOST_TT_IS_SAME_HPP_INCLUDED 41 42