[C++-sig] Polymorphism between Python and C++

[Patrick Hartling]

I'm doing some experimenting with Boost.Python v2, and I have run into a 
problem I just can't seem to solve.  I want to define an abstract base 
class in C++, derive a Python class from that base, and then use the 
derived Python class polymorphically where the abstract C++ class can be 
used.  I have attached the simplest code I could come up with that 
demonstrates the problem.  When I run test.py, I get the following output:

I'm Derived1!
Traceback (most recent call last):
   File "./test.py", line 18, in ?
     handler.setObj(derived2)
TypeError: bad argument type for built-in operation

I have been over the documentation (both on boost.org and on the 
PythonInfo Wiki), but I can't figure out what I am doing wrong.  It seems 
like I am close, but there must be some detail I'm missing.

  -Patrick


-- 
Patrick L. Hartling                     | Research Assistant, VRAC
patrick at vrac.iastate.edu                | 2624 Howe Hall: 1.515.294.4916
http://www.137.org/patrick/             | http://www.vrac.iastate.edu/
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