mirror of
https://github.com/bolero-MURAKAMI/Sprout
synced 2024-11-12 21:09:01 +00:00
70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2015 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_TUPLE_APPLY_HPP
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#define SPROUT_TUPLE_APPLY_HPP
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#include <utility>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/index_tuple/metafunction.hpp>
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#include <sprout/tuple/tuple/tuple.hpp>
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#include <sprout/tuple/tuple/get.hpp>
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#include <sprout/tuple/indexes.hpp>
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#include <sprout/utility/forward.hpp>
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namespace sprout {
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namespace tuples {
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//
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// apply_result
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//
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namespace detail {
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template<typename F, typename Tuple, typename IndexTuple>
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struct apply_result_impl;
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template<typename F, typename Tuple, sprout::index_t... Indexes>
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struct apply_result_impl<F, Tuple, sprout::index_tuple<Indexes...> > {
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public:
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typedef decltype(
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std::declval<F>()(
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sprout::tuples::get<Indexes>(std::declval<Tuple>())...
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)
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) type;
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};
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} // namespace detail
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template<typename F, typename Tuple>
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struct apply_result
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: public sprout::tuples::detail::apply_result_impl<
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F, Tuple,
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typename sprout::tuple_indexes<typename std::remove_reference<Tuple>::type>::type
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>
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{};
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//
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// apply
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//
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namespace detail {
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template<typename Result, typename F, typename Tuple, sprout::index_t... Indexes>
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inline SPROUT_CONSTEXPR Result
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apply_impl(F&& f, Tuple&& t, sprout::index_tuple<Indexes...>) {
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return SPROUT_FORWARD(F, f)(sprout::tuples::get<Indexes>(SPROUT_FORWARD(Tuple, t))...);
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}
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} // namespace detail
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template<typename F, typename Tuple>
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inline SPROUT_CONSTEXPR typename sprout::tuples::apply_result<F, Tuple>::type
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apply(F&& f, Tuple&& t) {
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return sprout::tuples::detail::apply_impl<typename sprout::tuples::apply_result<F, Tuple>::type>(
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SPROUT_FORWARD(F, f), SPROUT_FORWARD(Tuple, t),
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sprout::tuple_indexes<typename std::remove_reference<Tuple>::type>::make()
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);
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}
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} // namespace tuples
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using sprout::tuples::apply_result;
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using sprout::tuples::apply;
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} // namespace sprout
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#endif // #ifndef SPROUT_TUPLE_APPLY_HPP
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