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- /*
- Copyright Barrett Adair 2015-2017
- Distributed under the Boost Software License, Version 1.0.
- (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- */
- #ifndef BOOST_CLBL_TRTS_DETAIL_POLYFILLS_DISJUNCTION_HPP
- #define BOOST_CLBL_TRTS_DETAIL_POLYFILLS_DISJUNCTION_HPP
- #undef BOOST_CLBL_TRTS_DISJUNCTION
- #define BOOST_CLBL_TRTS_DISJUNCTION(...) \
- ::boost::callable_traits::detail::disjunction<__VA_ARGS__>
- namespace boost { namespace callable_traits { namespace detail {
- //polyfill for C++17 std::disjunction
- template<typename...>
- struct disjunction : std::false_type {};
- template<typename T>
- struct disjunction<T> : T {};
- template<typename T, typename... Ts>
- struct disjunction<T, Ts...>
- : std::conditional<T::value != false, T, disjunction<Ts...>>::type {};
- }}} // namespace boost::callable_traits::detail
- #endif // #ifndef BOOST_CLBL_TRTS_DETAIL_POLYFILLS_DISJUNCTION_HPP
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