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Diffstat (limited to 'src/third_party/boost-1.69.0/boost/fusion/sequence/intrinsic/value_at.hpp')
-rw-r--r-- | src/third_party/boost-1.69.0/boost/fusion/sequence/intrinsic/value_at.hpp | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/src/third_party/boost-1.69.0/boost/fusion/sequence/intrinsic/value_at.hpp b/src/third_party/boost-1.69.0/boost/fusion/sequence/intrinsic/value_at.hpp new file mode 100644 index 00000000000..152f0c94555 --- /dev/null +++ b/src/third_party/boost-1.69.0/boost/fusion/sequence/intrinsic/value_at.hpp @@ -0,0 +1,88 @@ +/*============================================================================= + 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_VALUE_AT_05052005_0229) +#define FUSION_VALUE_AT_05052005_0229 + +#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/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 + + namespace extension + { + template <typename Tag> + struct value_at_impl + { + template <typename Sequence, typename N> + struct apply; + }; + + template <> + struct value_at_impl<sequence_facade_tag> + { + template <typename Sequence, typename N> + struct apply : Sequence::template value_at<Sequence, N> {}; + }; + + template <> + struct value_at_impl<boost_tuple_tag>; + + template <> + struct value_at_impl<boost_array_tag>; + + template <> + struct value_at_impl<mpl_sequence_tag>; + + template <> + struct value_at_impl<std_pair_tag>; + } + + namespace detail + { + template <typename Sequence, typename N, typename Tag> + struct value_at_impl + : mpl::if_< + mpl::or_< + mpl::less<N, typename extension::size_impl<Tag>::template apply<Sequence>::type> + , traits::is_unbounded<Sequence> + > + , typename extension::value_at_impl<Tag>::template apply<Sequence, N> + , mpl::empty_base + >::type + {}; + } + + namespace result_of + { + template <typename Sequence, typename N> + struct value_at + : detail::value_at_impl<Sequence, N, typename detail::tag_of<Sequence>::type> + {}; + + template <typename Sequence, int N> + struct value_at_c + : fusion::result_of::value_at<Sequence, mpl::int_<N> > + {}; + } +}} + +#endif + |