| 1 | /* |
|---|---|
| 2 | Copyright 2019 Glen Joseph Fernandes |
| 3 | (glenjofe@gmail.com) |
| 4 | |
| 5 | Distributed under the Boost Software License, |
| 6 | Version 1.0. (See accompanying file LICENSE_1_0.txt |
| 7 | or copy at http://www.boost.org/LICENSE_1_0.txt) |
| 8 | */ |
| 9 | #ifndef BOOST_TT_COPY_REFERENCE_HPP_INCLUDED |
| 10 | #define BOOST_TT_COPY_REFERENCE_HPP_INCLUDED |
| 11 | |
| 12 | #include <boost/type_traits/add_lvalue_reference.hpp> |
| 13 | #include <boost/type_traits/add_rvalue_reference.hpp> |
| 14 | #include <boost/type_traits/is_lvalue_reference.hpp> |
| 15 | #include <boost/type_traits/is_rvalue_reference.hpp> |
| 16 | #include <boost/type_traits/conditional.hpp> |
| 17 | |
| 18 | namespace boost { |
| 19 | |
| 20 | template<class T, class U> |
| 21 | struct copy_reference { |
| 22 | typedef typename conditional<is_rvalue_reference<U>::value, |
| 23 | typename add_rvalue_reference<T>::type, |
| 24 | typename conditional<is_lvalue_reference<U>::value, |
| 25 | typename add_lvalue_reference<T>::type, T>::type>::type type; |
| 26 | }; |
| 27 | |
| 28 | #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES) |
| 29 | template<class T, class U> |
| 30 | using copy_reference_t = typename copy_reference<T, U>::type; |
| 31 | #endif |
| 32 | |
| 33 | } /* boost */ |
| 34 | |
| 35 | #endif |
| 36 |