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54 lines
1.9 KiB
C++
54 lines
1.9 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2019 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_MIN_ELEMENT_HPP
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#define SPROUT_TPP_ALGORITHM_MIN_ELEMENT_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 T, typename U>
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struct min_value
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: public std::conditional<(U::value < T::value), U, T>
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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 min_element_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 min_element_impl<Tup, First, Last, false>
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: public sprout::tpp::detail::min_value<
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typename sprout::tpp::detail::min_element_impl<Tup, First, (First + Last) / 2>::type,
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typename sprout::tpp::detail::min_element_impl<Tup, (First + Last) / 2, Last>::type
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>::type
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{};
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} // namespace detail
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//
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// min_element
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//
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template<typename... Types>
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struct min_element
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: public sprout::tpp::detail::min_element_impl<sprout::types::type_tuple<Types...>, 0, sizeof...(Types)>
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{};
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//
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// min_element_c
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//
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template<typename T, T... Values>
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struct min_element_c
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: public sprout::tpp::min_element<sprout::integral_constant<T, Values>...>
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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_MIN_ELEMENT_HPP
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