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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