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Make fusion::at<vector<...>,N> O(1).

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This commit is contained in:
Kohei Takahashi
2015-10-20 20:12:14 +09:00
parent c537da605b
commit 1ad2e59e07
3 changed files with 30 additions and 29 deletions
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32
include/boost/fusion/container/vector/vector.hpp
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@ -230,27 +230,37 @@ namespace boost { namespace fusion
assign(std::forward<Sequence>(seq), detail::index_sequence<M...>());
}
typedef extension::value_at_impl<vector_tag> value_at_impl;
template <std::size_t N, typename U>
static BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
auto at_detail(store<N, U>* this_) -> decltype(this_->get())
{
return this_->get();
}
template <std::size_t N, typename U>
static BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
auto at_detail(store<N, U> const* this_) -> decltype(this_->get())
{
return this_->get();
}
template <typename J>
BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
typename value_at_impl::template apply<vector_data, J>::type&
at_impl(J)
auto at_impl(J) -> decltype(at_detail<J::value>(this))
{
typedef typename value_at_impl::template apply<vector_data, J>::type U;
typedef store<J::value, U> S;
return static_cast<S*>(this)->get();
return at_detail<J::value>(this);
}
template <typename J>
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
typename value_at_impl::template apply<vector_data, J>::type const&
at_impl(J) const
auto at_impl(J) const -> decltype(at_detail<J::value>(this))
{
typedef typename value_at_impl::template apply<vector_data, J>::type U;
typedef store<J::value, U> S;
return static_cast<S const*>(this)->get();
return at_detail<J::value>(this);
}
template <std::size_t N, typename U>
static BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
U value_at_impl(store<N, U>*);
};
template <typename V, typename... T>