Finally fixed polymorphism issues

[SVN r16435]

test/polymorphism.cpp

@@ -0,0 +1,62 @@
+// Copyright David Abrahams 2002. Permission to copy, use,
+// modify, sell and distribute this software is granted provided this
+// copyright notice appears in all copies. This software is provided
+// "as is" without express or implied warranty, and with no claim as
+// to its suitability for any purpose.
+#include <boost/python.hpp>
+
+using namespace boost::python;
+
+struct Callback
+{
+    Callback(PyObject* o) : mSelf(o) {}
+    PyObject* mSelf;
+};
+
+struct A
+{
+    virtual ~A(){}
+    virtual std::string f() { return "A::f()"; }
+};
+
+struct ACallback :  A,  Callback
+{
+    ACallback (PyObject* self) : Callback(self) {}
+    
+    
+    std::string f()
+    {
+        return call_method<std::string>(mSelf, "f");
+    }
+    
+    std::string default_f()
+    {
+        return A::f();
+    }
+};
+
+struct B : A
+{
+    virtual std::string f() { return "B::f()"; }
+};
+
+A& getBCppObj ()
+{
+    static B b;
+    return b;
+}
+
+std::string call_f(A& a) { return a.f(); }
+
+BOOST_PYTHON_MODULE_INIT(polymorphism_ext)
+{
+    class_<A,boost::noncopyable,ACallback>("A")
+        .def("f", &A::f, &ACallback::default_f)
+        ;
+    
+    def("getBCppObj", getBCppObj, return_value_policy<reference_existing_object>());
+
+    def("call_f", call_f);
+}
+
+//#include "module_tail.cpp"