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Diffstat (limited to 'src/third_party/boost-1.69.0/boost/fusion/sequence/intrinsic/at.hpp')
-rw-r--r-- | src/third_party/boost-1.69.0/boost/fusion/sequence/intrinsic/at.hpp | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/src/third_party/boost-1.69.0/boost/fusion/sequence/intrinsic/at.hpp b/src/third_party/boost-1.69.0/boost/fusion/sequence/intrinsic/at.hpp new file mode 100644 index 00000000000..a103e078a2f --- /dev/null +++ b/src/third_party/boost-1.69.0/boost/fusion/sequence/intrinsic/at.hpp @@ -0,0 +1,134 @@ +/*============================================================================= + Copyright (c) 2001-2011 Joel de Guzman + + Distributed under the Boost Software License, Version 1.0. (See accompanying + file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) +==============================================================================*/ +#if !defined(FUSION_AT_05042005_0722) +#define FUSION_AT_05042005_0722 + +#include <boost/fusion/support/config.hpp> +#include <boost/mpl/int.hpp> +#include <boost/mpl/if.hpp> +#include <boost/mpl/or.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> +#include <boost/fusion/support/category_of.hpp> + +namespace boost { namespace fusion +{ + // Special tags: + struct sequence_facade_tag; + struct boost_tuple_tag; // boost::tuples::tuple tag + struct boost_array_tag; // boost::array tag + struct mpl_sequence_tag; // mpl sequence tag + struct std_pair_tag; // std::pair tag + struct std_tuple_tag; // std::tuple tag + + namespace extension + { + template <typename Tag> + struct at_impl + { + template <typename Sequence, typename N> + struct apply; + }; + + template <> + struct at_impl<sequence_facade_tag> + { + template <typename Sequence, typename N> + struct apply : Sequence::template at<Sequence, N> {}; + }; + + template <> + struct at_impl<boost_tuple_tag>; + + template <> + struct at_impl<boost_array_tag>; + + template <> + struct at_impl<mpl_sequence_tag>; + + template <> + struct at_impl<std_pair_tag>; + + template <> + struct at_impl<std_tuple_tag>; + } + + namespace detail + { + template <typename Sequence, typename N, typename Tag> + struct at_impl + : mpl::if_< + mpl::or_< + mpl::less<N, typename extension::size_impl<Tag>::template apply<Sequence>::type> + , traits::is_unbounded<Sequence> + > + , typename extension::at_impl<Tag>::template apply<Sequence, N> + , mpl::empty_base + >::type + {}; + } + + namespace result_of + { + template <typename Sequence, typename N> + struct at + : detail::at_impl<Sequence, N, typename detail::tag_of<Sequence>::type> + {}; + + template <typename Sequence, int N> + struct at_c + : at<Sequence, mpl::int_<N> > + {}; + } + + + template <typename N, typename Sequence> + BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED + inline typename + lazy_disable_if< + is_const<Sequence> + , result_of::at<Sequence, N> + >::type + at(Sequence& seq) + { + return result_of::at<Sequence, N>::call(seq); + } + + template <typename N, typename Sequence> + BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED + inline typename result_of::at<Sequence const, N>::type + at(Sequence const& seq) + { + return result_of::at<Sequence const, N>::call(seq); + } + + template <int N, typename Sequence> + BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED + inline typename + lazy_disable_if< + is_const<Sequence> + , result_of::at_c<Sequence, N> + >::type + at_c(Sequence& seq) + { + return fusion::at<mpl::int_<N> >(seq); + } + + template <int N, typename Sequence> + BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED + inline typename result_of::at_c<Sequence const, N>::type + at_c(Sequence const& seq) + { + return fusion::at<mpl::int_<N> >(seq); + } +}} + +#endif + |