320 lines
11 KiB
C++
Executable File
320 lines
11 KiB
C++
Executable File
/*=============================================================================
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Copyright (c) 2014-2015 Kohei Takahashi
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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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#ifndef FUSION_VECTOR_11052014_1625
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#define FUSION_VECTOR_11052014_1625
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#include <boost/config.hpp>
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/container/vector/detail/config.hpp>
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#include <boost/fusion/container/vector/vector_fwd.hpp>
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///////////////////////////////////////////////////////////////////////////////
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// Without variadics, we will use the PP version
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///////////////////////////////////////////////////////////////////////////////
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#if !defined(BOOST_FUSION_HAS_VARIADIC_VECTOR)
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# include <boost/fusion/container/vector/detail/cpp03/vector.hpp>
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#else
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///////////////////////////////////////////////////////////////////////////////
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// C++11 interface
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///////////////////////////////////////////////////////////////////////////////
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#include <boost/fusion/support/sequence_base.hpp>
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#include <boost/fusion/support/is_sequence.hpp>
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#include <boost/fusion/support/detail/and.hpp>
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#include <boost/fusion/support/detail/index_sequence.hpp>
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#include <boost/fusion/container/vector/detail/at_impl.hpp>
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#include <boost/fusion/container/vector/detail/value_at_impl.hpp>
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#include <boost/fusion/container/vector/detail/begin_impl.hpp>
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#include <boost/fusion/container/vector/detail/end_impl.hpp>
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#include <boost/fusion/sequence/intrinsic/begin.hpp>
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#include <boost/fusion/sequence/intrinsic/size.hpp>
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#include <boost/fusion/iterator/advance.hpp>
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#include <boost/fusion/iterator/deref.hpp>
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#include <boost/core/enable_if.hpp>
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#include <boost/mpl/int.hpp>
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#include <boost/type_traits/integral_constant.hpp>
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#include <boost/type_traits/is_base_of.hpp>
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#include <boost/type_traits/is_convertible.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <cstddef>
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#include <utility>
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namespace boost { namespace fusion
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{
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struct vector_tag;
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struct random_access_traversal_tag;
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namespace vector_detail
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{
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struct each_elem {};
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template <
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typename This, typename T, typename T_, std::size_t Size, bool IsSeq
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>
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struct can_convert_impl : false_type {};
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template <typename This, typename T, typename Sequence, std::size_t Size>
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struct can_convert_impl<This, T, Sequence, Size, true> : true_type {};
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template <typename This, typename Sequence, typename T>
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struct can_convert_impl<This, Sequence, T, 1, true>
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: integral_constant<
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bool
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, !is_convertible<
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Sequence
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, typename fusion::extension::value_at_impl<vector_tag>::
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template apply< This, mpl::int_<0> >::type
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>::value
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>
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{};
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template <typename This, typename T, typename T_, std::size_t Size>
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struct can_convert
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: can_convert_impl<
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This, T, T_, Size, traits::is_sequence<T_>::value
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>
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{};
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template <typename T, bool IsSeq, std::size_t Size>
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struct is_longer_sequence_impl : false_type {};
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template <typename Sequence, std::size_t Size>
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struct is_longer_sequence_impl<Sequence, true, Size>
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: integral_constant<
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bool, (fusion::result_of::size<Sequence>::value >= Size)
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>
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{};
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template<typename T, std::size_t Size>
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struct is_longer_sequence
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: is_longer_sequence_impl<T, traits::is_sequence<T>::value, Size>
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{};
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// forward_at_c allows to access Nth element even if ForwardSequence
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// since fusion::at_c requires RandomAccessSequence.
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namespace result_of
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{
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template <typename Sequence, int N>
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struct forward_at_c
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: fusion::result_of::deref<
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typename fusion::result_of::advance_c<
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typename fusion::result_of::begin<
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typename remove_reference<Sequence>::type
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>::type
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, N
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>::type
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>
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{};
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}
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template <int N, typename Sequence>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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inline typename result_of::forward_at_c<Sequence, N>::type
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forward_at_c(Sequence&& seq)
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{
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typedef typename
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result_of::forward_at_c<Sequence, N>::type
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result;
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return std::forward<result>(*advance_c<N>(begin(seq)));
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}
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// Object proxy since preserve object order
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template <std::size_t, typename T>
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struct store
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{
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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store()
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: elem() // value-initialized explicitly
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{}
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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store(store const& rhs)
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: elem(rhs.elem)
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{}
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BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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store&
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operator=(store const& rhs)
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{
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elem = rhs.elem;
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return *this;
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}
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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store(store&& rhs)
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: elem(static_cast<T&&>(rhs.elem))
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{}
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BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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store&
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operator=(store&& rhs)
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{
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elem = static_cast<T&&>(rhs.elem);
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return *this;
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}
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template <
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typename U
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, typename = typename boost::disable_if<
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is_base_of<store, typename remove_reference<U>::type>
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>::type
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>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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store(U&& rhs)
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: elem(std::forward<U>(rhs))
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{}
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using elem_type = T;
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T elem;
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};
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// placed outside of vector_data due to GCC < 6 bug
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template <std::size_t J, typename U>
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static inline BOOST_FUSION_GPU_ENABLED
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store<J, U> store_at_impl(store<J, U>*);
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template <typename I, typename ...T>
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struct vector_data;
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template <std::size_t ...I, typename ...T>
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struct vector_data<detail::index_sequence<I...>, T...>
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: store<I, T>...
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, sequence_base<vector_data<detail::index_sequence<I...>, T...> >
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{
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typedef vector_tag fusion_tag;
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typedef fusion_sequence_tag tag; // this gets picked up by MPL
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typedef mpl::false_ is_view;
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typedef random_access_traversal_tag category;
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typedef mpl::int_<sizeof...(T)> size;
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typedef vector<T...> type_sequence;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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BOOST_DEFAULTED_FUNCTION(vector_data(), {})
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template <
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typename Sequence
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, typename Sequence_ = typename remove_reference<Sequence>::type
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, typename = typename boost::enable_if<
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can_convert<vector_data, Sequence, Sequence_, sizeof...(I)>
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>::type
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>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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explicit
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vector_data(each_elem, Sequence&& rhs)
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: store<I, T>(forward_at_c<I>(std::forward<Sequence>(rhs)))...
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{}
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template <typename ...U>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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explicit
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vector_data(each_elem, U&&... var)
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: store<I, T>(std::forward<U>(var))...
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{}
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template <typename Sequence>
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BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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void
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assign_sequence(Sequence&& seq)
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{
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assign(std::forward<Sequence>(seq), detail::index_sequence<I...>());
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}
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template <typename Sequence>
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BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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void
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assign(Sequence&&, detail::index_sequence<>) {}
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template <typename Sequence, std::size_t N, std::size_t ...M>
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BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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void
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assign(Sequence&& seq, detail::index_sequence<N, M...>)
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{
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at_impl(mpl::int_<N>()) = vector_detail::forward_at_c<N>(seq);
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assign(std::forward<Sequence>(seq), detail::index_sequence<M...>());
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}
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private:
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template <std::size_t J>
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using store_at = decltype(store_at_impl<J>(static_cast<vector_data*>(nullptr)));
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public:
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template <typename J>
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BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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typename store_at<J::value>::elem_type& at_impl(J)
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{
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return store_at<J::value>::elem;
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}
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template <typename J>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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typename store_at<J::value>::elem_type const& at_impl(J) const
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{
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return store_at<J::value>::elem;
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}
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};
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} // namespace boost::fusion::vector_detail
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template <typename... T>
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struct vector
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: vector_detail::vector_data<
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typename detail::make_index_sequence<sizeof...(T)>::type
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, T...
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>
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{
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typedef vector_detail::vector_data<
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typename detail::make_index_sequence<sizeof...(T)>::type
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, T...
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> base;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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BOOST_DEFAULTED_FUNCTION(vector(), {})
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template <
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typename... U
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, typename = typename boost::enable_if_c<(
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sizeof...(U) >= 1 &&
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fusion::detail::and_<is_convertible<U, T>...>::value &&
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!fusion::detail::and_<
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is_base_of<vector, typename remove_reference<U>::type>...
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>::value
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)>::type
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>
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// XXX: constexpr become error due to pull-request #79, booooo!!
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// In the (near) future release, should be fixed.
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/* BOOST_CONSTEXPR */ BOOST_FUSION_GPU_ENABLED
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explicit vector(U&&... u)
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: base(vector_detail::each_elem(), std::forward<U>(u)...)
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{}
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template <
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typename Sequence
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, typename = typename boost::enable_if_c<
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vector_detail::is_longer_sequence<
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typename remove_reference<Sequence>::type, sizeof...(T)
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>::value
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>::type
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>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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vector(Sequence&& seq)
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: base(vector_detail::each_elem(), std::forward<Sequence>(seq))
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{}
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template <typename Sequence>
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BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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vector&
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operator=(Sequence&& rhs)
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{
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base::assign_sequence(std::forward<Sequence>(rhs));
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return *this;
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}
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};
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}}
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#endif
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#endif
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