//
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// Copyright (c) 2016-2019 Damian Jarek (damian dot jarek93 at gmail dot com)
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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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//
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// Official repository: https://github.com/boostorg/beast
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//
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#ifndef BOOST_BEAST_DETAIL_TUPLE_HPP
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#define BOOST_BEAST_DETAIL_TUPLE_HPP
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#include <boost/mp11/integer_sequence.hpp>
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#include <boost/mp11/algorithm.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#include <boost/type_traits/copy_cv.hpp>
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#include <cstdlib>
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#include <utility>
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namespace boost {
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namespace beast {
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namespace detail {
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template<std::size_t I, class T>
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struct tuple_element_impl
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{
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T t;
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tuple_element_impl(T const& t_)
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: t(t_)
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{
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}
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tuple_element_impl(T&& t_)
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: t(std::move(t_))
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{
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}
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};
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template<std::size_t I, class T>
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struct tuple_element_impl<I, T&>
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{
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T& t;
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tuple_element_impl(T& t_)
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: t(t_)
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{
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}
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};
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template<class... Ts>
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struct tuple_impl;
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template<class... Ts, std::size_t... Is>
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struct tuple_impl<
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boost::mp11::index_sequence<Is...>, Ts...>
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: tuple_element_impl<Is, Ts>...
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{
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template<class... Us>
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explicit tuple_impl(Us&&... us)
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: tuple_element_impl<Is, Ts>(
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std::forward<Us>(us))...
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{
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}
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};
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template<class... Ts>
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struct tuple : tuple_impl<
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boost::mp11::index_sequence_for<Ts...>, Ts...>
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{
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template<class... Us>
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explicit tuple(Us&&... us)
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: tuple_impl<
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boost::mp11::index_sequence_for<Ts...>, Ts...>{
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std::forward<Us>(us)...}
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{
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}
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};
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template<std::size_t I, class T>
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T&
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get(tuple_element_impl<I, T>& te)
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{
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return te.t;
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}
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template<std::size_t I, class T>
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T const&
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get(tuple_element_impl<I, T> const& te)
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{
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return te.t;
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}
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template<std::size_t I, class T>
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T&&
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get(tuple_element_impl<I, T>&& te)
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{
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return std::move(te.t);
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}
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template<std::size_t I, class T>
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T&
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get(tuple_element_impl<I, T&>&& te)
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{
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return te.t;
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}
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template <std::size_t I, class T>
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using tuple_element = typename boost::copy_cv<
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mp11::mp_at_c<typename remove_cv<T>::type, I>, T>::type;
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} // detail
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} // beast
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} // boost
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#endif
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