1 /*============================================================================= 2 Copyright (c) 2001-2011 Joel de Guzman 3 Copyright (c) 2005-2006 Dan Marsden 4 5 Distributed under the Boost Software License, Version 1.0. (See accompanying 6 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 7 ==============================================================================*/ 8 #if !defined(BOOST_FUSION_HAS_KEY_IMPL_31122005_1647) 9 #define BOOST_FUSION_HAS_KEY_IMPL_31122005_1647 10 11 #include <boost/fusion/support/config.hpp> 12 #include <boost/mpl/has_key.hpp> 13 14 namespace boost { namespace fusion 15 { 16 struct mpl_sequence_tag; 17 18 namespace extension 19 { 20 template <typename Tag> 21 struct has_key_impl; 22 23 template <> 24 struct has_key_impl<mpl_sequence_tag> 25 { 26 template <typename Sequence, typename Key> 27 struct apply : mpl::has_key<Sequence, Key> {}; 28 }; 29 } 30 }} 31 32 #endif 33