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boost
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callable_traits
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detail
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polyfills
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/usr/include/boost/callable_traits/detail/polyfills/disjunction.hpp
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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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