On 04/29/11 09:14, zeb wrote:
mb.free_fun('createWorker').call_policies =
call_policies.return_value_policy(call_policies.return_pointee_value)
you do not want to have *value* of an abstract class.
I found that if the IWorker class is not abstract, for example:
class IWorker {
public:
virtual int getData() { return 0; }
};
Python doesn't report that error, but the result of the following code is
not expected(I think it should be 100).
You expectancy is wrong. If you keep IWorker by value there will be no dynamic
dispatch.
This is not related to py++, python or boost::python. Its just the same as in
c++. If you wrote a c++ function that takes IWorker parameter by value you'd get
the same behavior.
Basic rule of thumb: if you're dealing with inheritance, do not pass object by
value.
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