I'm using Boost.Python to wrap Box2D, a 2D physics engine written in C++. The user of Box2D starts by constructing an instance of class b2World. The b2World class has member functions for creating and destroying bodies and joints (for constraining the movement of the bodies). The b2Body class has member functions for creating and destroying fixtures (for attaching collisions shapes to the body). The created instances are returned as raw pointers.
Is there a safe and efficient way of associating a Python wrapper instance with a wrapped C++ instance, where the Python instance doesn't manage the lifecycle of the C++ instance? I was thinking of adding a member variable to the C++ class that tracks the Python wrapper instance if any has been created, and do something intelligent on destruction of the C++ instance, i.e. marking the Python instance as invalid. I would like to throw an exception if the user attempts to access the destructed C++ instance through the invalid Python instance. Is the above a good approach? If it is, has anyone got any best practices or recommendations for the implementation? -- Mikael Lind http://elemel.se/ _______________________________________________ Cplusplus-sig mailing list Cplusplus-sig@python.org http://mail.python.org/mailman/listinfo/cplusplus-sig
