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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_31122005_1647)
+#define BOOST_FUSION_HAS_KEY_IMPL_31122005_1647
+
+#include <boost/mpl/has_key.hpp>
+
+namespace boost { namespace fusion
+{
+ struct mpl_sequence_tag;
+
+ namespace extension
+ {
+ template <typename Tag>
+ struct has_key_impl;
+
+ template <>
+ struct has_key_impl<mpl_sequence_tag>
+ {
+ template <typename Sequence, typename Key>
+ struct apply : mpl::has_key<Sequence, Key> {};
+ };
+ }
+}}
+
+#endif