--- /dev/null
+// Copyright (c) 2018 Adam Butcher, Antony Polukhin
+// Copyright (c) 2019-2020 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_TIE_FROM_STRUCTURE_TUPLE_HPP
+#define BOOST_PFR_DETAIL_TIE_FROM_STRUCTURE_TUPLE_HPP
+#pragma once
+
+#include <boost/pfr/detail/config.hpp>
+
+#include <boost/pfr/detail/core.hpp>
+
+#include <boost/pfr/detail/stdtuple.hpp>
+#include <boost/pfr/tuple_size.hpp>
+#include <boost/pfr/detail/make_integer_sequence.hpp>
+
+#include <tuple>
+
+namespace boost { namespace pfr { namespace detail {
+
+/// \brief A `std::tuple` capable of de-structuring assignment used to support
+/// a tie of multiple lvalue references to fields of an aggregate T.
+///
+/// \sa boost::pfr::tie_from_structure
+template <typename... Elements>
+struct tie_from_structure_tuple : std::tuple<Elements&...> {
+ using base = std::tuple<Elements&...>;
+ using base::base;
+
+ template <typename T>
+ constexpr tie_from_structure_tuple& operator= (T const& t) {
+ base::operator=(
+ detail::make_stdtiedtuple_from_tietuple(
+ detail::tie_as_tuple(t),
+ detail::make_index_sequence<tuple_size_v<T>>()));
+ return *this;
+ }
+};
+
+}}} // boost::pfr::detail
+
+#endif // BOOST_PFR_DETAIL_TIE_FROM_STRUCTURE_TUPLE_HPP