forked from boostorg/mp11
130 lines
4.0 KiB
C++
130 lines
4.0 KiB
C++
#ifndef BOOST_MP11_TUPLE_HPP_INCLUDED
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#define BOOST_MP11_TUPLE_HPP_INCLUDED
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// Copyright 2015-2020 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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// tuple_transform
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namespace detail
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{
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template<std::size_t J, class... Tp>
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BOOST_MP11_CONSTEXPR auto tp_extract( Tp&&... tp )
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-> decltype( std::forward_as_tuple( std::get<J>( std::forward<Tp>( tp ) )... ) )
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{
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return std::forward_as_tuple( std::get<J>( std::forward<Tp>( tp ) )... );
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}
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template<class... T> BOOST_MP11_CONSTEXPR auto tp_forward( T&&... t ) -> std::tuple<T...>
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{
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return std::tuple<T...>( std::forward<T>( t )... );
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}
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template<class F, class... Tp, std::size_t... J>
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BOOST_MP11_CONSTEXPR auto tuple_transform_impl( integer_sequence<std::size_t, J...>, F const& f, Tp&&... tp )
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-> decltype( tp_forward( tuple_apply( f, tp_extract<J>( std::forward<Tp>(tp)... ) )... ) )
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{
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return tp_forward( tuple_apply( f, tp_extract<J>( std::forward<Tp>(tp)... ) )... );
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}
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} // namespace detail
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template<class F, class Tp1, class... Tp,
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class Seq = make_index_sequence<std::tuple_size<typename std::remove_reference<Tp1>::type>::value>>
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BOOST_MP11_CONSTEXPR auto tuple_transform( F const& f, Tp1&& tp1, Tp&&... tp )
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-> decltype( detail::tuple_transform_impl( Seq(), f, std::forward<Tp1>(tp1), std::forward<Tp>(tp)... ) )
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{
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return detail::tuple_transform_impl( Seq(), f, std::forward<Tp1>(tp1), std::forward<Tp>(tp)... );
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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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