/*============================================================================= Copyright (c) 2001-2006 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