Hi Python-Experts :-)
i am starting to get really frustrated trying to expose a simple C++
polymorphism to python with boost::python.
I do have the following structure in C++:
struct Base {
int typeID;
};
struct Derived : public Base {
int derivedProperty;
}
//and some more from base derived types....
Base *returnSomethingDerivedFromBase(...) {
Derived *ret = new Derived;
ret->derivedProperty = 1234;
return ret;
}
BOOST_PYTHON_MODULE(foo)
{
class_<Base>("Base")
.add_property("baseProperty", &Base::baseProperty);
class_<Derived, bases<Base> >("Derived")
.add_property("derivedProperty", &Derived::derivedProperty);
def("returnSomethingDerivedFromBase",
returnSomethingDerivedFromBase);
}
And in Python i just want to have the following:
object = returnSomethingFromDerived() #object is of type Base
if object.typeID = 1:
#here i want to cast to Derived and access "derivedProperty"
#but this is not working :-( :
object.__class__ = Derived
Is there a way to accomplish this at all? Or isn´t this possible as it
would be in C++ ?
Thanks a lot for your help!!
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