45 lines
1.4 KiB
C++
45 lines
1.4 KiB
C++
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// Copyright (c) 2018 Adam Butcher, Antony Polukhin
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// Copyright (c) 2019-2022 Antony Polukhin
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//
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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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#ifndef BOOST_PFR_DETAIL_TIE_FROM_STRUCTURE_TUPLE_HPP
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#define BOOST_PFR_DETAIL_TIE_FROM_STRUCTURE_TUPLE_HPP
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#pragma once
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#include <boost/pfr/detail/config.hpp>
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#include <boost/pfr/detail/core.hpp>
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#include <boost/pfr/detail/stdtuple.hpp>
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#include <boost/pfr/tuple_size.hpp>
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#include <boost/pfr/detail/make_integer_sequence.hpp>
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#include <tuple>
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namespace boost { namespace pfr { namespace detail {
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/// \brief A `std::tuple` capable of de-structuring assignment used to support
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/// a tie of multiple lvalue references to fields of an aggregate T.
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///
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/// \sa boost::pfr::tie_from_structure
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template <typename... Elements>
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struct tie_from_structure_tuple : std::tuple<Elements&...> {
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using base = std::tuple<Elements&...>;
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using base::base;
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template <typename T>
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constexpr tie_from_structure_tuple& operator= (T const& t) {
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base::operator=(
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detail::make_stdtiedtuple_from_tietuple(
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detail::tie_as_tuple(t),
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detail::make_index_sequence<tuple_size_v<T>>()));
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return *this;
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}
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};
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}}} // namespace boost::pfr::detail
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#endif // BOOST_PFR_DETAIL_TIE_FROM_STRUCTURE_TUPLE_HPP
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