Piro: can we make the observers follow some inheritance chain?

[bartgol]

Enhancement

RIght now, the three classes ObserverBase, ROL_ObserverBase, and SolutionObserverBase are unrelated. In my app, I want to write a single observer class that covers all needs, since there is a lot of overlap here. However, these classes often declare a method with the same name and similar (sometime same) signature, making it confusing and possibly bug prone.

Can we do away with some observers and have just one, or at the very least make them inherit from each other? Is there a reason why we have these 3 completely unrelated classes?

@mperego

[mperego]

Good question. I think we can merge them or derive them from a base class.
@kliegeois @jewatkins, do you see any issues with that?

[kliegeois]

I do not see any issues of doing that as of now.

[jewatkins]

single base class seems fine.