InvalidMemoryOperationError when calling functions from destructors

[Volfram]

Further inspection suggests that the BetaClass object I was 
accessing was already finalized by the time the AlphaClass object 
got around to trying to mess with it.  Conclusion is that whether 
it's the in-destructor access or not, it's simply not safe to try 
to clean things up this way.  I think I have a safer alternative.

What was interesting is that even after the BetaClass object has 
been cleaned up, I can access any variables it may have 
contained.  If, for example, it has an integer value that's 
publicly visible, I can still read that.(haven't tried writing.)