?????????? ????????? - ??????????????? - /usr/include/boost/pfr/detail/stdtuple.hpp
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// Copyright (c) 2016-2020 Antony Polukhin // // 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 BOOST_PFR_DETAIL_STDTUPLE_HPP #define BOOST_PFR_DETAIL_STDTUPLE_HPP #pragma once #include <boost/pfr/detail/config.hpp> #include <utility> // metaprogramming stuff #include <tuple> #include <boost/pfr/detail/sequence_tuple.hpp> namespace boost { namespace pfr { namespace detail { template <class T, std::size_t... I> constexpr auto make_stdtuple_from_tietuple(const T& t, std::index_sequence<I...>) noexcept { return std::make_tuple( boost::pfr::detail::sequence_tuple::get<I>(t)... ); } template <class T, std::size_t... I> constexpr auto make_stdtiedtuple_from_tietuple(const T& t, std::index_sequence<I...>) noexcept { return std::tie( boost::pfr::detail::sequence_tuple::get<I>(t)... ); } template <class T, std::size_t... I> constexpr auto make_conststdtiedtuple_from_tietuple(const T& t, std::index_sequence<I...>) noexcept { return std::tuple< std::add_lvalue_reference_t<std::add_const_t< std::remove_reference_t<decltype(boost::pfr::detail::sequence_tuple::get<I>(t))> >>... >( boost::pfr::detail::sequence_tuple::get<I>(t)... ); } }}} // namespace boost::pfr::detail #endif // BOOST_PFR_DETAIL_STDTUPLE_HPP
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