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- /*=============================================================================
- Copyright (c) 2001-2011 Joel de Guzman
- Copyright (c) 2005-2006 Dan Marsden
- 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_HAS_KEY_IMPL_20060223_2156)
- #define BOOST_FUSION_HAS_KEY_IMPL_20060223_2156
- #include <boost/type_traits/is_same.hpp>
- #include <boost/mpl/or.hpp>
- namespace fields
- {
- struct name;
- struct age;
- }
- namespace example
- {
- struct example_sequence_tag;
- }
- namespace boost { namespace fusion {
- namespace extension
- {
- template<typename Tag>
- struct has_key_impl;
- template<>
- struct has_key_impl<example::example_sequence_tag>
- {
- template<typename Sequence, typename Key>
- struct apply
- : mpl::or_<
- is_same<Key, fields::name>,
- is_same<Key, fields::age> >
- {};
- };
- }
- }}
- #endif
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