Closest Common Type

BCS ao at
Fri May 16 09:47:19 PDT 2008

I have a tuple of types, I want a template that evaluates to the most specialized 
base type of all of them. I'll be using it for classes but for other cases 
it just needs to do something sane (erroring out would do). 

No point in reinventing the wheel so, anyone have such a template laying 

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