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