I'm using a class inherited from G4VSteppingVerbose in Athena, the ATLAS software framework. When I'm using this class outside of Athena, I can make it work. But inside Athena, in which I cannot call G4VSteppingVerbose::SetInstance() before the G4RunManager is initialized, I'm having enormous problems getting the class to work. While tracing through elaborate debug procedures, I discovered the reason for my difficulty: Although G4VSteppingVerbose is supposed to be a singleton class, almost all of the "protected" and "private" variables are _not_ declared static. This means that if I somehow manage to instantiate a second class that inherits from G4VSteppingVerbose, I'm probably going to get segmentation faults and uninitialized variables all over the place. As you can guess, this is exactly what happens when I try to run my code within Athena. I know you're not responsible for Athena, but since G4VSteppingVerbose is supposed to be singleton anyway, would it be possible to declare _all_ of its variables to be static? That would re-inforce the OO design of the class -- and incidentally make my life much easier. Thanks.
The class will be changed to be truely singleton. When the second object is instantiated, G4Eception will be called without core dumps. This implementation may differ from the user's wish, but the desired behavior for the class designed as singleton.
