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96 lines
2.7 KiB
96 lines
2.7 KiB
#ifndef BOOST_MP11_TUPLE_HPP_INCLUDED |
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#define BOOST_MP11_TUPLE_HPP_INCLUDED |
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// Copyright 2015, 2017 Peter Dimov. |
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// |
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// Distributed under the Boost Software License, Version 1.0. |
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// |
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// See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt |
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#include <boost/mp11/integer_sequence.hpp> |
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#include <boost/mp11/detail/config.hpp> |
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#include <tuple> |
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#include <utility> |
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#include <type_traits> |
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#include <cstddef> |
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#if BOOST_MP11_MSVC |
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# pragma warning( push ) |
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# pragma warning( disable: 4100 ) // unreferenced formal parameter 'tp' |
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#endif |
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namespace boost |
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{ |
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namespace mp11 |
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{ |
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// tuple_apply |
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namespace detail |
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{ |
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template<class F, class Tp, std::size_t... J> BOOST_MP11_CONSTEXPR auto tuple_apply_impl( F && f, Tp && tp, integer_sequence<std::size_t, J...> ) |
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-> decltype( std::forward<F>(f)( std::get<J>(std::forward<Tp>(tp))... ) ) |
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{ |
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return std::forward<F>(f)( std::get<J>(std::forward<Tp>(tp))... ); |
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} |
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} // namespace detail |
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template<class F, class Tp, |
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class Seq = make_index_sequence<std::tuple_size<typename std::remove_reference<Tp>::type>::value>> |
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BOOST_MP11_CONSTEXPR auto tuple_apply( F && f, Tp && tp ) |
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-> decltype( detail::tuple_apply_impl( std::forward<F>(f), std::forward<Tp>(tp), Seq() ) ) |
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{ |
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return detail::tuple_apply_impl( std::forward<F>(f), std::forward<Tp>(tp), Seq() ); |
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} |
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// construct_from_tuple |
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namespace detail |
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{ |
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template<class T, class Tp, std::size_t... J> BOOST_MP11_CONSTEXPR T construct_from_tuple_impl( Tp && tp, integer_sequence<std::size_t, J...> ) |
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{ |
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return T( std::get<J>(std::forward<Tp>(tp))... ); |
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} |
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} // namespace detail |
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template<class T, class Tp, |
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class Seq = make_index_sequence<std::tuple_size<typename std::remove_reference<Tp>::type>::value>> |
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BOOST_MP11_CONSTEXPR T construct_from_tuple( Tp && tp ) |
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{ |
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return detail::construct_from_tuple_impl<T>( std::forward<Tp>(tp), Seq() ); |
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} |
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// tuple_for_each |
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namespace detail |
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{ |
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template<class Tp, std::size_t... J, class F> BOOST_MP11_CONSTEXPR F tuple_for_each_impl( Tp && tp, integer_sequence<std::size_t, J...>, F && f ) |
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{ |
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using A = int[sizeof...(J)]; |
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return (void)A{ ((void)f(std::get<J>(std::forward<Tp>(tp))), 0)... }, std::forward<F>(f); |
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} |
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template<class Tp, class F> BOOST_MP11_CONSTEXPR F tuple_for_each_impl( Tp && /*tp*/, integer_sequence<std::size_t>, F && f ) |
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{ |
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return std::forward<F>(f); |
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} |
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} // namespace detail |
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template<class Tp, class F> BOOST_MP11_CONSTEXPR F tuple_for_each( Tp && tp, F && f ) |
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{ |
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using seq = make_index_sequence<std::tuple_size<typename std::remove_reference<Tp>::type>::value>; |
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return detail::tuple_for_each_impl( std::forward<Tp>(tp), seq(), std::forward<F>(f) ); |
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} |
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} // namespace mp11 |
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} // namespace boost |
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#if BOOST_MP11_MSVC |
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# pragma warning( pop ) |
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#endif |
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#endif // #ifndef BOOST_TUPLE_HPP_INCLUDED
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