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add C++17 make_from_tuple

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bolero-MURAKAMI 2017-10-11 17:26:42 +09:00
parent eec9c86920
commit 23408e46c4
4 changed files with 50 additions and 6 deletions
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43
sprout/tuple/make_from_tuple.hpp Normal file
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/*=============================================================================
Copyright (c) 2011-2017 Bolero MURAKAMI
https://github.com/bolero-MURAKAMI/Sprout
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#ifndef SPROUT_TUPLE_MAKE_FROM_TUPLE_HPP
#define SPROUT_TUPLE_MAKE_FROM_TUPLE_HPP
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/tuple/tuple/tuple.hpp>
#include <sprout/tuple/tuple/get.hpp>
#include <sprout/tuple/indexes.hpp>
#include <sprout/utility/forward.hpp>
namespace sprout {
namespace tuples {
//
// make_from_tuple
//
namespace detail {
template<typename T, typename Tuple, sprout::index_t... Indexes>
inline SPROUT_CONSTEXPR T
make_from_tuple_impl(Tuple&& t, sprout::index_tuple<Indexes...>) {
return T(sprout::get<Indexes>(SPROUT_FORWARD(Tuple, t))...);
}
} // namespace detail
template<typename T, typename Tuple>
inline SPROUT_CONSTEXPR T
make_from_tuple(Tuple&& t) {
return sprout::tuples::detail::make_from_tuple_impl<T>(
SPROUT_FORWARD(Tuple, t),
sprout::tuple_indexes<typename std::remove_reference<Tuple>::type>::make()
);
}
} // namespace tuples
using sprout::tuples::make_from_tuple;
} // namespace sprout
#endif // #ifndef SPROUT_TUPLE_MAKE_FROM_TUPLE_HPP