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