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+/*=============================================================================
+ 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