[C++-sig] Re: Making copy of function derived from C++ pure virtual function

[Paul F. Kunz]

>>>>> On Sun, 12 Dec 2004 22:26:21 -0500, David Abrahams <dave at boost-consulting.com> said:

> This means some Python exception is being thrown.  You might set a
> breakpoint on boost::python::detail::throw_error_already_set (I
> think I have the namespace right) and look just up the stack to see
> what the actual error being reported is.

   It appears that Python is creating the null pointer in type_call()
after these lines...

		type = obj->ob_type;
		if (PyType_HasFeature(type, Py_TPFLAGS_HAVE_CLASS) &&
		    type->tp_init != NULL &&
		    type->tp_init(obj, args, kwds) < 0) {
			Py_DECREF(obj);
			obj = NULL;