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- /*=============================================================================
- Copyright (c) 2001-2013 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(BOOST_FUSION_MAP_DETAIL_AT_KEY_IMPL_02042013_0821)
- #define BOOST_FUSION_MAP_DETAIL_AT_KEY_IMPL_02042013_0821
- #include <boost/fusion/support/config.hpp>
- #include <boost/fusion/support/detail/access.hpp>
- #include <boost/type_traits/is_const.hpp>
- #include <boost/mpl/at.hpp>
- #include <boost/mpl/identity.hpp>
- #include <boost/utility/declval.hpp>
- namespace boost { namespace fusion
- {
- struct map_tag;
- namespace extension
- {
- template <typename Tag>
- struct at_key_impl;
- template <>
- struct at_key_impl<map_tag>
- {
- template <typename Sequence, typename Key>
- struct apply
- {
- typedef
- decltype(boost::declval<Sequence>().get(mpl::identity<Key>()))
- type;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type
- call(Sequence& m)
- {
- return m.get(mpl::identity<Key>());
- }
- };
- template <typename Sequence, typename Key>
- struct apply<Sequence const, Key>
- {
- typedef
- decltype(boost::declval<Sequence const>().get(mpl::identity<Key>()))
- type;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type
- call(Sequence const& m)
- {
- return m.get(mpl::identity<Key>());
- }
- };
- };
- }
- }}
- #endif
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