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Merge pull request #198 from Kojoley/vector-simplify-at_impl

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vector: Simplify at_impl
This commit is contained in:
Kohei Takahashi
2018-10-25 22:12:38 +09:00
committed by GitHub
parent 309a2d623f efe9065b8c
commit 753db26073
1 changed files with 14 additions and 17 deletions
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31
include/boost/fusion/container/vector/vector.hpp
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@ -168,9 +168,15 @@ namespace boost { namespace fusion
: elem(std::forward<U>(rhs)) : elem(std::forward<U>(rhs))
{} {}
using elem_type = T;
T elem; T elem;
}; };
// placed outside of vector_data due to GCC < 6 bug
template <std::size_t J, typename U>
static inline BOOST_FUSION_GPU_ENABLED
store<J, U> store_at_impl(store<J, U>*);
template <typename I, typename ...T> template <typename I, typename ...T>
struct vector_data; struct vector_data;
@ -231,32 +237,23 @@ namespace boost { namespace fusion
assign(std::forward<Sequence>(seq), detail::index_sequence<M...>()); assign(std::forward<Sequence>(seq), detail::index_sequence<M...>());
} }
template <std::size_t N, typename U> private:
static BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED template <std::size_t J>
U& at_detail(store<N, U>* this_) using store_at = decltype(store_at_impl<J>(static_cast<vector_data*>(nullptr)));
{
return this_->elem;
}
template <std::size_t N, typename U>
static BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
U const& at_detail(store<N, U> const* this_)
{
return this_->elem;
}
public:
template <typename J> template <typename J>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
auto at_impl(J) -> decltype(at_detail<J::value>(&std::declval<vector_data&>())) typename store_at<J::value>::elem_type& at_impl(J)
{ {
return at_detail<J::value>(this); return store_at<J::value>::elem;
} }
template <typename J> template <typename J>
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
auto at_impl(J) const -> decltype(at_detail<J::value>(&std::declval<vector_data const&>())) typename store_at<J::value>::elem_type const& at_impl(J) const
{ {
return at_detail<J::value>(this); return store_at<J::value>::elem;
} }
}; };
} // namespace boost::fusion::vector_detail } // namespace boost::fusion::vector_detail