cross-project inheritance question

Hi --

I have two projects, A and B. Both are a mix of C++ and Python, with swig4 interfaces.  Project A defines some classes that are used in project B, both by importing python modules and by C++ #includes.   A C++ class in B  (BClass) is derived from a C++ class in A (AClass).  Both classes have swig-generated Python equivalents.  

In Python, I want to pass a wrapped instance of the derived class (in B) to a wrapped function in A that expects an AClass* argument.  But the wrapper for A is rejecting the argument because it doesn't know that BClass is derived from A's AClass.  How can I tell swig about the inheritance?  I've tried declaring AClass as "extern" in B's swig file, and also duplicating AClass in the file, but those don't seem to work.

Should I add a typemap to A so that the function doesn't check its argument type, and just call SWIG_ConvertPtr manually?

Thanks,
   Steve



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