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diff --git a/boost/serialization/base_object.hpp b/boost/serialization/base_object.hpp
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+#ifndef BOOST_SERIALIZATION_BASE_OBJECT_HPP
+#define BOOST_SERIALIZATION_BASE_OBJECT_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// base_object.hpp:
+
+// (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.
+
+// if no archive headers have been included this is a no op
+// this is to permit BOOST_EXPORT etc to be included in a 
+// file declaration header
+
+#include <boost/config.hpp>
+#include <boost/detail/workaround.hpp>
+
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/int.hpp>
+#include <boost/mpl/bool.hpp>
+#include <boost/mpl/identity.hpp>
+
+#include <boost/type_traits/is_base_and_derived.hpp>
+#include <boost/type_traits/is_pointer.hpp>
+#include <boost/type_traits/is_const.hpp>
+#include <boost/type_traits/is_polymorphic.hpp>
+
+#include <boost/static_assert.hpp>
+#include <boost/serialization/access.hpp>
+#include <boost/serialization/force_include.hpp>
+#include <boost/serialization/void_cast_fwd.hpp>
+
+namespace boost {
+namespace serialization {
+
+namespace detail
+{
+    // get the base type for a given derived type
+    // preserving the const-ness
+    template<class B, class D>
+    struct base_cast
+    {
+        typedef BOOST_DEDUCED_TYPENAME
+        mpl::if_<
+            is_const<D>,
+            const B,
+            B
+        >::type type;
+        BOOST_STATIC_ASSERT(is_const<type>::value == is_const<D>::value);
+    };
+
+    // only register void casts if the types are polymorphic
+    template<class Base, class Derived>
+    struct base_register
+    {
+        struct polymorphic {
+            static void const * invoke(){
+                Base const * const b = 0;
+                Derived const * const d = 0;
+                return & void_cast_register(d, b);
+            }
+        };
+        struct non_polymorphic {
+            static void const * invoke(){
+                return 0;
+            }
+        };
+        static void const * invoke(){
+            typedef BOOST_DEDUCED_TYPENAME mpl::eval_if<
+                is_polymorphic<Base>,
+                mpl::identity<polymorphic>,
+                mpl::identity<non_polymorphic>
+            >::type type;
+            return type::invoke();
+        }
+    };
+
+} // namespace detail
+#if defined(__BORLANDC__) && __BORLANDC__ < 0x610
+template<class Base, class Derived>
+const Base & 
+base_object(const Derived & d)
+{
+    BOOST_STATIC_ASSERT(! is_pointer<Derived>::value);
+    detail::base_register<Base, Derived>::invoke();
+    return access::cast_reference<const Base, Derived>(d);
+}
+#else
+template<class Base, class Derived>
+BOOST_DEDUCED_TYPENAME detail::base_cast<Base, Derived>::type & 
+base_object(Derived &d)
+{
+    BOOST_STATIC_ASSERT(( is_base_and_derived<Base,Derived>::value));
+    BOOST_STATIC_ASSERT(! is_pointer<Derived>::value);
+    typedef BOOST_DEDUCED_TYPENAME detail::base_cast<Base, Derived>::type type;
+    detail::base_register<type, Derived>::invoke();
+    return access::cast_reference<type, Derived>(d);
+}
+#endif
+
+} // namespace serialization
+} // namespace boost
+
+#endif // BOOST_SERIALIZATION_BASE_OBJECT_HPP