| 1 | // Copyright (c) 2018 Adam Butcher, Antony Polukhin |
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| 2 | // Copyright (c) 2019-2024 Antony Polukhin |
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| 3 | // |
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| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
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| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 6 | |
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| 7 | #ifndef BOOST_PFR_DETAIL_TIE_FROM_STRUCTURE_TUPLE_HPP |
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| 8 | #define BOOST_PFR_DETAIL_TIE_FROM_STRUCTURE_TUPLE_HPP |
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| 9 | #pragma once |
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| 10 | |
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| 11 | #include <boost/pfr/detail/config.hpp> |
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| 12 | |
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| 13 | #include <boost/pfr/detail/core.hpp> |
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| 14 | |
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| 15 | #include <boost/pfr/detail/stdtuple.hpp> |
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| 16 | #include <boost/pfr/tuple_size.hpp> |
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| 17 | #include <boost/pfr/detail/make_integer_sequence.hpp> |
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| 18 | |
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| 19 | #include <tuple> |
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| 20 | |
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| 21 | namespace boost { namespace pfr { namespace detail { |
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| 22 | |
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| 23 | /// \brief A `std::tuple` capable of de-structuring assignment used to support |
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| 24 | /// a tie of multiple lvalue references to fields of an aggregate T. |
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| 25 | /// |
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| 26 | /// \sa boost::pfr::tie_from_structure |
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| 27 | template <typename... Elements> |
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| 28 | struct tie_from_structure_tuple : std::tuple<Elements&...> { |
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| 29 | using base = std::tuple<Elements&...>; |
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| 30 | using base::base; |
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| 31 | |
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| 32 | template <typename T> |
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| 33 | constexpr tie_from_structure_tuple& operator= (T const& t) { |
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| 34 | base::operator=( |
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| 35 | detail::make_stdtiedtuple_from_tietuple( |
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| 36 | detail::tie_as_tuple(t), |
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| 37 | detail::make_index_sequence<tuple_size_v<T>>())); |
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| 38 | return *this; |
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| 39 | } |
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| 40 | }; |
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| 41 | |
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| 42 | }}} // namespace boost::pfr::detail |
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| 43 | |
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| 44 | #endif // BOOST_PFR_DETAIL_TIE_FROM_STRUCTURE_TUPLE_HPP |
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| 45 | |
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