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diff --git a/boost/python/def_visitor.hpp b/boost/python/def_visitor.hpp
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+// Copyright David Abrahams 2003.
+// 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)
+#ifndef DEF_VISITOR_DWA2003810_HPP
+# define DEF_VISITOR_DWA2003810_HPP
+
+# include <boost/python/detail/prefix.hpp>
+# include <boost/detail/workaround.hpp>
+
+namespace boost { namespace python { 
+
+template <class DerivedVisitor> class def_visitor;
+template <class T, class X1, class X2, class X3> class class_;
+
+class def_visitor_access
+{
+# if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)                  \
+    || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
+    // Tasteless as this may seem, making all members public allows member templates
+    // to work in the absence of member template friends.
+ public:
+# else      
+    template <class Derived> friend class def_visitor;
+# endif
+    
+    // unnamed visit, c.f. init<...>, container suites
+    template <class V, class classT>
+    static void visit(V const& v, classT& c)
+    {
+        v.derived_visitor().visit(c);
+    }
+
+    // named visit, c.f. object, pure_virtual
+    template <class V, class classT, class OptionalArgs>
+    static void visit(
+        V const& v
+      , classT& c
+      , char const* name
+      , OptionalArgs const& options
+    ) 
+    {
+        v.derived_visitor().visit(c, name, options);
+    }
+    
+};
+
+
+template <class DerivedVisitor>
+class def_visitor
+{
+    friend class def_visitor_access;
+    
+# if defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)                  \
+    || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
+    // Tasteless as this may seem, making all members public allows member templates
+    // to work in the absence of member template friends.
+ public:
+# else      
+    template <class T, class X1, class X2, class X3> friend class class_;
+# endif
+    
+    // unnamed visit, c.f. init<...>, container suites
+    template <class classT>
+    void visit(classT& c) const
+    {
+        def_visitor_access::visit(*this, c);
+    }
+
+    // named visit, c.f. object, pure_virtual
+    template <class classT, class OptionalArgs>
+    void visit(classT& c, char const* name, OptionalArgs const& options) const
+    {
+        def_visitor_access::visit(*this, c, name, options);
+    }
+    
+ protected:
+    DerivedVisitor const& derived_visitor() const
+    {
+        return static_cast<DerivedVisitor const&>(*this);
+    }
+};
+
+}} // namespace boost::python
+
+#endif // DEF_VISITOR_DWA2003810_HPP