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+
+#ifndef BOOST_MPL_AUX_NESTED_TYPE_WKND_HPP_INCLUDED
+#define BOOST_MPL_AUX_NESTED_TYPE_WKND_HPP_INCLUDED
+
+// Copyright Aleksey Gurtovoy 2000-2004
+//
+// 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)
+//
+// See http://www.boost.org/libs/mpl for documentation.
+
+// $Id$
+// $Date$
+// $Revision$
+
+#include <boost/mpl/aux_/config/gcc.hpp>
+#include <boost/mpl/aux_/config/workaround.hpp>
+
+#if BOOST_WORKAROUND(BOOST_MPL_CFG_GCC, BOOST_TESTED_AT(0x0302)) \
+    || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x561)) \
+    || BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x530)) \
+    || BOOST_WORKAROUND(__DMC__, BOOST_TESTED_AT(0x840))
+
+namespace boost { namespace mpl { namespace aux {
+template< typename T > struct nested_type_wknd
+    : T::type
+{
+};
+}}}
+
+#if BOOST_WORKAROUND(__DMC__, BOOST_TESTED_AT(0x840))
+#   define BOOST_MPL_AUX_NESTED_TYPE_WKND(T) \
+    aux::nested_type_wknd<T> \
+/**/
+#else
+#   define BOOST_MPL_AUX_NESTED_TYPE_WKND(T) \
+    ::boost::mpl::aux::nested_type_wknd<T> \
+/**/
+#endif
+
+#else // !BOOST_MPL_CFG_GCC et al.
+
+#   define BOOST_MPL_AUX_NESTED_TYPE_WKND(T) T::type
+
+#endif 
+
+#endif // BOOST_MPL_AUX_NESTED_TYPE_WKND_HPP_INCLUDED