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["Garth N. Wells" <gnw20@xxxxxxxxx>]

It would be useful if Coefficient had the eval member functions which 
are common to Expression and Function. Coefficient may no longer be the 
best name, but are there any objections?

Here's an example of how I would like to use it: I have a Surface class 
which has a function for representing the surface. This can be a 
user-defined or a fe function (it cannot change from one to the other). 
I would like to store it as Coefficient with an eval interface like

Coefficient::evaluate(double* values,
                      const double* coordinates,
                      const ufc::cell& cell) const;

Garth