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diff --git a/boost/python/ptr.hpp b/boost/python/ptr.hpp
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+#ifndef PTR_DWA20020601_HPP
+# define PTR_DWA20020601_HPP
+
+# include <boost/python/detail/prefix.hpp>
+// Copyright David Abrahams 2002.
+// 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)
+//
+// Based on boost/ref.hpp, thus:
+//  Copyright (C) 1999, 2000 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
+//  Copyright (C) 2001 Peter Dimov
+
+# if _MSC_VER+0 >= 1020
+#  pragma once
+# endif
+
+# include <boost/config.hpp>
+# include <boost/mpl/bool.hpp>
+
+namespace boost { namespace python {
+
+template<class Ptr> class pointer_wrapper
+{ 
+ public:
+    typedef Ptr type;
+    
+    explicit pointer_wrapper(Ptr x): p_(x) {}
+    operator Ptr() const { return p_; }
+    Ptr get() const { return p_; }
+ private:
+    Ptr p_;
+};
+
+template<class T>
+inline pointer_wrapper<T> ptr(T t)
+{ 
+    return pointer_wrapper<T>(t);
+}
+
+# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+template<typename T>
+class is_pointer_wrapper
+    : public mpl::false_
+{
+};
+
+template<typename T>
+class is_pointer_wrapper<pointer_wrapper<T> >
+    : public mpl::true_
+{
+};
+
+template<typename T>
+class unwrap_pointer
+{
+ public:
+    typedef T type;
+};
+
+template<typename T>
+class unwrap_pointer<pointer_wrapper<T> >
+{
+ public:
+    typedef T type;
+};
+# else // no partial specialization
+
+}} // namespace boost::python
+
+#include <boost/type.hpp>
+
+namespace boost { namespace python {
+
+namespace detail
+{
+  typedef char (&yes_pointer_wrapper_t)[1];
+  typedef char (&no_pointer_wrapper_t)[2];
+      
+  no_pointer_wrapper_t is_pointer_wrapper_test(...);
+
+  template<typename T>
+  yes_pointer_wrapper_t is_pointer_wrapper_test(boost::type< pointer_wrapper<T> >);
+
+  template<bool wrapped>
+  struct pointer_unwrapper
+  {
+      template <class T>
+      struct apply
+      {
+          typedef T type;
+      };
+  };
+
+  template<>
+  struct pointer_unwrapper<true>
+  {
+      template <class T>
+      struct apply
+      {
+          typedef typename T::type type;
+      };
+  };
+}
+
+template<typename T>
+class is_pointer_wrapper
+{
+ public:
+    BOOST_STATIC_CONSTANT(
+        bool, value = (
+        sizeof(detail::is_pointer_wrapper_test(boost::type<T>()))
+            == sizeof(detail::yes_pointer_wrapper_t)));
+    typedef mpl::bool_<value> type;
+};
+
+template <typename T>
+class unwrap_pointer
+    : public detail::pointer_unwrapper<
+        is_pointer_wrapper<T>::value
+      >::template apply<T>
+{};
+
+# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+}} // namespace boost::python
+
+#endif // #ifndef PTR_DWA20020601_HPP