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diff --git a/boost/python/detail/borrowed_ptr.hpp b/boost/python/detail/borrowed_ptr.hpp
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+++ b/boost/python/detail/borrowed_ptr.hpp
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+#ifndef BORROWED_PTR_DWA20020601_HPP
+# define BORROWED_PTR_DWA20020601_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)
+
+# include <boost/config.hpp>
+# include <boost/type.hpp>
+# include <boost/mpl/if.hpp>
+# include <boost/type_traits/object_traits.hpp>
+# include <boost/type_traits/cv_traits.hpp>
+# include <boost/python/tag.hpp>
+
+namespace boost { namespace python { namespace detail {
+
+template<class T> class borrowed
+{ 
+    typedef T type;
+};
+
+# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+template<typename T>
+struct is_borrowed_ptr
+{
+    BOOST_STATIC_CONSTANT(bool, value = false); 
+};
+
+#  if !defined(__MWERKS__) || __MWERKS__ > 0x3000
+template<typename T>
+struct is_borrowed_ptr<borrowed<T>*>
+{
+    BOOST_STATIC_CONSTANT(bool, value = true);
+};
+
+template<typename T>
+struct is_borrowed_ptr<borrowed<T> const*>
+{
+    BOOST_STATIC_CONSTANT(bool, value = true);
+};
+
+template<typename T>
+struct is_borrowed_ptr<borrowed<T> volatile*>
+{
+    BOOST_STATIC_CONSTANT(bool, value = true);
+};
+
+template<typename T>
+struct is_borrowed_ptr<borrowed<T> const volatile*>
+{
+    BOOST_STATIC_CONSTANT(bool, value = true);
+};
+#  else
+template<typename T>
+struct is_borrowed
+{
+    BOOST_STATIC_CONSTANT(bool, value = false);
+};
+template<typename T>
+struct is_borrowed<borrowed<T> >
+{
+    BOOST_STATIC_CONSTANT(bool, value = true);
+};
+template<typename T>
+struct is_borrowed_ptr<T*>
+    : is_borrowed<typename remove_cv<T>::type>
+{
+};
+#  endif 
+
+# else // no partial specialization
+
+typedef char (&yes_borrowed_ptr_t)[1];
+typedef char (&no_borrowed_ptr_t)[2];
+
+no_borrowed_ptr_t is_borrowed_ptr_test(...);
+
+template <class T>
+typename mpl::if_c<
+    is_pointer<T>::value
+    , T
+    , int
+    >::type
+is_borrowed_ptr_test1(boost::type<T>);
+
+template<typename T>
+yes_borrowed_ptr_t is_borrowed_ptr_test(borrowed<T> const volatile*);
+
+template<typename T>
+class is_borrowed_ptr
+{
+ public:
+    BOOST_STATIC_CONSTANT(
+        bool, value = (
+            sizeof(detail::is_borrowed_ptr_test(is_borrowed_ptr_test1(boost::type<T>())))
+            == sizeof(detail::yes_borrowed_ptr_t)));
+};
+
+# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+}
+
+template <class T>
+inline T* get_managed_object(detail::borrowed<T> const volatile* p, tag_t)
+{
+    return (T*)p;
+}
+
+}} // namespace boost::python::detail
+
+#endif // #ifndef BORROWED_PTR_DWA20020601_HPP