1 2 // (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000. 3 // Use, modification and distribution are subject to the Boost Software License, 4 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at 5 // http://www.boost.org/LICENSE_1_0.txt). 6 // 7 // See http://www.boost.org/libs/type_traits for most recent version including documentation. 8 9 #ifndef BOOST_TT_REMOVE_REFERENCE_HPP_INCLUDED 10 #define BOOST_TT_REMOVE_REFERENCE_HPP_INCLUDED 11 12 #include <boost/config.hpp> 13 #include <boost/detail/workaround.hpp> 14 15 namespace boost { 16 17 18 namespace detail{ 19 // 20 // We can't filter out rvalue_references at the same level as 21 // references or we get ambiguities from msvc: 22 // 23 template <class T> 24 struct remove_rvalue_ref 25 { 26 typedef T type; 27 }; 28 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES 29 template <class T> 30 struct remove_rvalue_ref<T&&> 31 { 32 typedef T type; 33 }; 34 #endif 35 36 } // namespace detail 37 38 template <class T> struct remove_reference{ typedef typename boost::detail::remove_rvalue_ref<T>::type type; }; 39 template <class T> struct remove_reference<T&>{ typedef T type; }; 40 41 #if defined(BOOST_ILLEGAL_CV_REFERENCES) 42 // these are illegal specialisations; cv-qualifies applied to 43 // references have no effect according to [8.3.2p1], 44 // C++ Builder requires them though as it treats cv-qualified 45 // references as distinct types... 46 template <class T> struct remove_reference<T&const>{ typedef T type; }; 47 template <class T> struct remove_reference<T&volatile>{ typedef T type; }; 48 template <class T> struct remove_reference<T&const volatile>{ typedef T type; }; 49 #endif 50 51 #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES) 52 53 template <class T> using remove_reference_t = typename remove_reference<T>::type; 54 55 #endif 56 57 } // namespace boost 58 59 #endif // BOOST_TT_REMOVE_REFERENCE_HPP_INCLUDED 60