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From: Matthias Schabel (boost_at_[hidden])
Date: 2007-04-05 15:37:14

> I think you would need to write the equivalent of a computer algebra
> system to track what variables are "independent", and you would
> have to
> do so across programming boundaries in a non-trivial way.


Thanks for the thorough synopsis - clearly, the covariance issue is
the least of the challenges here. You're probably right that it is
basically impossible to implement in full generality without huge
runtime overhead since you would need to track the complete history
of operations for every variable...


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