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Diffstat (limited to 'boost/fusion/container/map/detail/at_impl.hpp')
-rw-r--r-- | boost/fusion/container/map/detail/at_impl.hpp | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/boost/fusion/container/map/detail/at_impl.hpp b/boost/fusion/container/map/detail/at_impl.hpp new file mode 100644 index 0000000000..f871bee085 --- /dev/null +++ b/boost/fusion/container/map/detail/at_impl.hpp @@ -0,0 +1,57 @@ +/*============================================================================= + Copyright (c) 2001-2011 Joel de Guzman + Copyright (c) 2011 Brandon Kohn + + 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(BOOST_FUSION_MAP_DETAIL_AT_IMPL_HPP) +#define BOOST_FUSION_MAP_DETAIL_AT_IMPL_HPP + +#include <boost/fusion/support/detail/access.hpp> +#include <boost/type_traits/is_const.hpp> +#include <boost/mpl/at.hpp> +#include <boost/mpl/int.hpp> + +namespace boost { namespace fusion +{ + struct map_tag; + + namespace extension + { + template <typename Tag> + struct at_impl; + + template <> + struct at_impl<map_tag> + { + template <typename Sequence, typename N> + struct apply + { + typedef mpl::at<typename Sequence::storage_type::types, N> element; + typedef typename detail::ref_result<element>::type type; + + static type + call(Sequence& m) + { + return m.get_data().at_impl(N()); + } + }; + + template <typename Sequence, typename N> + struct apply <Sequence const, N> + { + typedef mpl::at<typename Sequence::storage_type::types, N> element; + typedef typename detail::cref_result<element>::type type; + + static type + call(Sequence const& m) + { + return m.get_data().at_impl(N()); + } + }; + }; + } +}} + +#endif //BOOST_FUSION_MAP_DETAIL_AT_IMPL_HPP |