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diff --git a/boost/python/object/class_wrapper.hpp b/boost/python/object/class_wrapper.hpp
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+// Copyright David Abrahams 2001.
+// 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 CLASS_WRAPPER_DWA20011221_HPP
+# define CLASS_WRAPPER_DWA20011221_HPP
+
+# include <boost/python/to_python_converter.hpp>
+#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
+# include <boost/python/converter/pytype_function.hpp>
+#endif
+# include <boost/ref.hpp>
+
+namespace boost { namespace python { namespace objects { 
+
+//
+// These two classes adapt the static execute function of a class
+// MakeInstance execute() function returning a new PyObject*
+// reference. The first one is used for class copy constructors, and
+// the second one is used to handle smart pointers.
+//
+
+template <class Src, class MakeInstance>
+struct class_cref_wrapper
+    : to_python_converter<Src,class_cref_wrapper<Src,MakeInstance> ,true>
+{
+    static PyObject* convert(Src const& x)
+    {
+        return MakeInstance::execute(boost::ref(x));
+    }
+#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
+    static PyTypeObject const *get_pytype() { return converter::registered_pytype_direct<Src>::get_pytype(); }
+#endif
+};
+
+template <class Src, class MakeInstance>
+struct class_value_wrapper
+    : to_python_converter<Src,class_value_wrapper<Src,MakeInstance> ,true>
+{
+    static PyObject* convert(Src x)
+    {
+        return MakeInstance::execute(x);
+    }
+#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
+    static PyTypeObject const *get_pytype() { return MakeInstance::get_pytype(); }
+#endif
+};
+
+}}} // namespace boost::python::objects
+
+#endif // CLASS_WRAPPER_DWA20011221_HPP