mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2014 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_FUSED_HPP
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#define SPROUT_TUPLE_FUSED_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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// fused
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//
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template<typename F>
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class fused {
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public:
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typedef F functor_type;
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private:
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template<typename Tuple, typename IndexTuple>
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struct result_impl;
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template<typename Tuple, sprout::index_t... Indexes>
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struct result_impl<Tuple, sprout::index_tuple<Indexes...> > {
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public:
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typedef decltype(
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std::declval<functor_type const&>()(
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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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public:
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template<typename Tuple>
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struct result
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: public result_impl<
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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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private:
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functor_type f_;
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private:
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template<typename Result, typename Tuple, sprout::index_t... Indexes>
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SPROUT_CONSTEXPR Result
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call(Tuple&& t, sprout::index_tuple<Indexes...>) const {
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return f_(sprout::tuples::get<Indexes>(SPROUT_FORWARD(Tuple, t))...);
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}
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public:
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SPROUT_CONSTEXPR fused() SPROUT_DEFAULTED_DEFAULT_CONSTRUCTOR_DECL
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fused(fused const&) = default;
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explicit SPROUT_CONSTEXPR fused(F f)
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: f_(f)
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{}
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SPROUT_CONSTEXPR functor_type functor() const {
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return f_;
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}
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template<typename Tuple>
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SPROUT_CONSTEXPR typename result<Tuple>::type
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operator()(Tuple&& t) const {
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return call<typename result<Tuple>::type>(
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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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};
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//
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// make_fused
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//
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template<typename F>
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inline SPROUT_CONSTEXPR sprout::tuples::fused<F>
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make_fused(F const& f) {
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return sprout::tuples::fused<F>(f);
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}
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} // namespace tuples
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using sprout::tuples::fused;
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using sprout::tuples::make_fused;
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} // namespace sprout
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#endif // #ifndef SPROUT_TUPLE_FUSED_HPP
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