I will suppose you have access to the module namespace containing the derived class. I'll call this "module_namespace". So, you can retrieve the class using Boost.Python very simply : boost::python::object cls = module_namespace["DerivedClass"] And now, you can create the object with : boost::python::object obj = cls(); And to get a pointer to the underlying C++ object : MyClass* cpp_obj = extract<MyClass*>(obj); It should work ... Pierre Peter a écrit :

Another question, and I really hope this doesn't get emailed four idnetical times like my last question. My sincere apologies in advance if it does.

I have a C++ class with a virtual function that I want overridden in Python. I expose it to Python in the normal way:

class_<MyClass>("CPP_Class", no_init) .def("vfunc", &MyClass::func);

And in Python the user derives from this class overrides the virtual method, e.g.:

class DerivedClass(CPP_Class): def vfunc(self): #do stuff in Python

I want to create an instance of "DerivedClass" from C++ and assign it to the base class ptr and then call the overridden Python function via the virtual fn defined in the C++ base class. So my question is; how do I, from C++, create this instance of DerivedClass (assuming I know that the user called it DerivedClass)?

Thank you very much for any help, Peter

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-- Pierre Barbier de Reuille INRA - UMR Cirad/Inra/Cnrs/Univ.MontpellierII AMAP Botanique et Bio-informatique de l'Architecture des Plantes TA40/PSII, Boulevard de la Lironde 34398 MONTPELLIER CEDEX 5, France tel : (33) 4 67 61 65 77 fax : (33) 4 67 61 56 68