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Improve vector value_at performance.

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This commit is contained in:
Kohei Takahashi
2017-10-07 14:18:29 +09:00
parent 24d1c7fd1a
commit e606ceeff0
2 changed files with 9 additions and 9 deletions
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14
include/boost/fusion/container/vector/detail/value_at_impl.hpp
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@ -23,7 +23,6 @@
/////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////
#include <boost/fusion/container/vector/vector_fwd.hpp> #include <boost/fusion/container/vector/vector_fwd.hpp>
#include <boost/type_traits/declval.hpp> #include <boost/type_traits/declval.hpp>
#include <boost/type_traits/remove_cv.hpp>
namespace boost { namespace fusion namespace boost { namespace fusion
{ {
@ -31,8 +30,12 @@ namespace boost { namespace fusion
namespace vector_detail namespace vector_detail
{ {
template <typename I, typename ...T> template <std::size_t I, typename T>
struct vector_data; struct store;
template <std::size_t N, typename U>
static inline BOOST_FUSION_GPU_ENABLED
U value_at_impl(store<N, U> const volatile*);
} }
namespace extension namespace extension
@ -46,8 +49,9 @@ namespace boost { namespace fusion
template <typename Sequence, typename N> template <typename Sequence, typename N>
struct apply struct apply
{ {
typedef typename boost::remove_cv<Sequence>::type seq; typedef
typedef typename mpl::identity<decltype(seq::template value_at_impl<N::value>(boost::declval<seq*>()))>::type::type type; decltype(vector_detail::value_at_impl<N::value>(boost::declval<Sequence*>()))
type;
}; };
}; };
} }

4
include/boost/fusion/container/vector/vector.hpp
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@ -258,10 +258,6 @@ namespace boost { namespace fusion
{ {
return at_detail<J::value>(this); return at_detail<J::value>(this);
} }
template <std::size_t N, typename U>
static BOOST_FUSION_GPU_ENABLED
mpl::identity<U> value_at_impl(store<N, U>*);
}; };
} // namespace boost::fusion::vector_detail } // namespace boost::fusion::vector_detail