1 /*============================================================================= 2 Copyright (c) 2016 Paul Fultz II 3 using.hpp 4 Distributed under the Boost Software License, Version 1.0. (See accompanying 5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 6 ==============================================================================*/ 7 8 #ifndef BOOST_HOF_GUARD_USING_HPP 9 #define BOOST_HOF_GUARD_USING_HPP 10 11 #include <boost/hof/config.hpp> 12 13 #if BOOST_HOF_HAS_TEMPLATE_ALIAS 14 #define BOOST_HOF_USING(name, ...) using name = __VA_ARGS__ 15 #define BOOST_HOF_USING_TYPENAME(name, ...) using name = typename __VA_ARGS__ 16 #else 17 #define BOOST_HOF_USING(name, ...) struct name : std::enable_if<true, __VA_ARGS__>::type {} 18 #define BOOST_HOF_USING_TYPENAME(name, ...) struct name : __VA_ARGS__ {} 19 #endif 20 21 #endif 22