ContactCreator abstract class
abstract class ContactCreator { Contact contactCreateFcn(DefaultWorldPool argPool, Fixture fixtureA, Fixture fixtureB); void contactDestroyFcn(DefaultWorldPool argPool, Contact contact); }
abstract class ContactCreator { Contact contactCreateFcn(DefaultWorldPool argPool, Fixture fixtureA, Fixture fixtureB); void contactDestroyFcn(DefaultWorldPool argPool, Contact contact); }