diff options
Diffstat (limited to 'boost/fusion/sequence/intrinsic/at.hpp')
| -rw-r--r-- | boost/fusion/sequence/intrinsic/at.hpp | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/boost/fusion/sequence/intrinsic/at.hpp b/boost/fusion/sequence/intrinsic/at.hpp index aa0d97445d..fdfa72a60a 100644 --- a/boost/fusion/sequence/intrinsic/at.hpp +++ b/boost/fusion/sequence/intrinsic/at.hpp @@ -9,6 +9,9 @@ #include <boost/fusion/support/config.hpp> #include <boost/mpl/int.hpp> +#include <boost/mpl/if.hpp> +#include <boost/mpl/less.hpp> +#include <boost/mpl/empty_base.hpp> #include <boost/type_traits/is_const.hpp> #include <boost/fusion/sequence/intrinsic_fwd.hpp> #include <boost/fusion/support/tag_of.hpp> @@ -56,12 +59,23 @@ namespace boost { namespace fusion struct at_impl<std_tuple_tag>; } + namespace detail + { + template <typename Sequence, typename N, typename Tag> + struct at_impl + : mpl::if_< + mpl::less<N, typename extension::size_impl<Tag>::template apply<Sequence>::type> + , typename extension::at_impl<Tag>::template apply<Sequence, N> + , mpl::empty_base + >::type + {}; + } + namespace result_of { template <typename Sequence, typename N> struct at - : extension::at_impl<typename detail::tag_of<Sequence>::type>:: - template apply<Sequence, N> + : detail::at_impl<Sequence, N, typename detail::tag_of<Sequence>::type> {}; template <typename Sequence, int N> @@ -72,7 +86,7 @@ namespace boost { namespace fusion template <typename N, typename Sequence> - BOOST_FUSION_GPU_ENABLED + BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED inline typename lazy_disable_if< is_const<Sequence> @@ -84,7 +98,7 @@ namespace boost { namespace fusion } template <typename N, typename Sequence> - BOOST_FUSION_GPU_ENABLED + BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED inline typename result_of::at<Sequence const, N>::type at(Sequence const& seq) { @@ -92,7 +106,7 @@ namespace boost { namespace fusion } template <int N, typename Sequence> - BOOST_FUSION_GPU_ENABLED + BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED inline typename lazy_disable_if< is_const<Sequence> @@ -104,7 +118,7 @@ namespace boost { namespace fusion } template <int N, typename Sequence> - BOOST_FUSION_GPU_ENABLED + BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED inline typename result_of::at_c<Sequence const, N>::type at_c(Sequence const& seq) { |