mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2016 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_TPP_ALGORITHM_ONE_OF_HPP
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#define SPROUT_TPP_ALGORITHM_ONE_OF_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/type_traits/integral_constant.hpp>
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#include <sprout/type/type_tuple.hpp>
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namespace sprout {
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namespace tpp {
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namespace detail {
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template<typename Tup, std::size_t First, std::size_t Last, bool = (Last - First == 1)>
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struct one_of_impl_1
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: public sprout::bool_constant<!std::tuple_element<First, Tup>::type::value>
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{};
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template<typename Tup, std::size_t First, std::size_t Last>
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struct one_of_impl_1<Tup, First, Last, false>
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: public sprout::bool_constant<
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sprout::tpp::detail::one_of_impl_1<Tup, First, (First + Last) / 2>::value
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&& sprout::tpp::detail::one_of_impl_1<Tup, (First + Last) / 2, Last>::value
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>
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{};
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template<typename Tup, std::size_t First, std::size_t Last, bool = (Last - First == 1)>
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struct one_of_impl
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: public std::tuple_element<First, Tup>::type
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{};
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template<typename Tup, std::size_t First, std::size_t Last>
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struct one_of_impl<Tup, First, Last, false>
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: public sprout::bool_constant<
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sprout::tpp::detail::one_of_impl<Tup, First, (First + Last) / 2>::value
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? sprout::tpp::detail::one_of_impl_1<Tup, (First + Last) / 2, Last>::value
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: sprout::tpp::detail::one_of_impl<Tup, (First + Last) / 2, Last>::value
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>
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{};
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} // namespace detail
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//
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// one_of
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//
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template<typename... Types>
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struct one_of
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: public sprout::tpp::detail::one_of_impl<sprout::types::type_tuple<Types...>, 0, sizeof...(Types)>
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{};
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template<>
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struct one_of<>
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: public sprout::false_type
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{};
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//
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// one_of_c
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//
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template<bool... Values>
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struct one_of_c
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: public sprout::tpp::one_of<sprout::bool_constant<Values>...>
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{};
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// namespace detail {
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// template<bool... Values>
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// struct one_of_impl;
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// template<>
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// struct one_of_impl<>
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// : public sprout::false_type
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// {};
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// template<>
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// struct one_of_impl<true>
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// : public sprout::true_type
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// {};
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// template<>
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// struct one_of_impl<false>
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// : public sprout::false_type
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// {};
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// template<bool... Tail>
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// struct one_of_impl<true, Tail...>
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// : public sprout::tpp::none_of_c<Tail...>
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// {};
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// template<bool... Tail>
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// struct one_of_impl<false, Tail...>
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// : public sprout::bool_constant<sprout::tpp::detail::one_of_impl<Tail...>::value>
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// {};
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// } // namespace detail
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// //
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// // one_of_c
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// //
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// template<bool... Values>
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// struct one_of_c
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// : public sprout::tpp::detail::one_of_impl<Values...>
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// {};
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// //
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// // one_of
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// //
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// template<typename... Types>
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// struct one_of
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// : public sprout::tpp::one_of_c<Types::value...>
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// {};
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} // namespace tpp
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} // namespace sprout
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#endif // #ifndef SPROUT_TPP_ALGORITHM_ONE_OF_HPP
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