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+#ifndef BOOST_SERIALIZATION_TYPE_INFO_IMPLEMENTATION_HPP
+#define BOOST_SERIALIZATION_TYPE_INFO_IMPLEMENTATION_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// type_info_implementation.hpp: interface for portable version of type_info
+
+// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . 
+// Use, modification and distribution is subject to 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 for updates, documentation, and revision history.
+
+
+#include <boost/config.hpp>
+#include <boost/detail/workaround.hpp>
+
+#include <boost/static_assert.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/identity.hpp>
+#include <boost/type_traits/is_base_and_derived.hpp>
+#include <boost/serialization/traits.hpp>
+
+namespace boost {
+namespace serialization {
+
+// note that T and const T are folded into const T so that
+// there is only one table entry per type
+template<class T>
+struct type_info_implementation {
+    template<class U>
+    struct traits_class_typeinfo_implementation {
+      typedef typename U::type_info_implementation::type type;
+    };
+    // note: at least one compiler complained w/o the full qualification
+    // on basic traits below
+    typedef 
+        typename mpl::eval_if<
+            is_base_and_derived<boost::serialization::basic_traits, T>,
+            traits_class_typeinfo_implementation< T >,
+        //else
+            mpl::identity<
+                typename extended_type_info_impl< T >::type
+            >
+        >::type type;
+};
+
+} // namespace serialization
+} // namespace boost
+
+// define a macro to assign a particular derivation of extended_type_info
+// to a specified a class. 
+#define BOOST_CLASS_TYPE_INFO(T, ETI)              \
+namespace boost {                                  \
+namespace serialization {                          \
+template<>                                         \
+struct type_info_implementation< T > {             \
+    typedef ETI type;                              \
+};                                                 \
+template<>                                         \
+struct type_info_implementation< const T > {       \
+    typedef ETI type;                              \
+};                                                 \
+}                                                  \
+}                                                  \
+/**/
+
+#endif /// BOOST_SERIALIZATION_TYPE_INFO_IMPLEMENTATION_HPP