dolfin team mailing list archive

[Johan Hake <hake@xxxxxxxxx>]

On Wednesday 04 November 2009 09:37:55 Garth N. Wells wrote:
> kent-and@xxxxxxxxx wrote:
> > Hi, I am very happy with the  Expression, but old code like
> >
> > class Dabla(Function):
> >     def eval(...)
> >
> > still works.
> >
> > The only problem is that the function is zero even though eval is
> > implemented. Is it
> > possible to turn this old code into an error?
> 
> In C++, no. There is no mechanism in C++ to prevent a user overloading
> or hiding a member function.

In Python, using meta classes, yes. 

This is a nice exercise for those of you who want to get to know meta classes 
in Python. ;) If and when I have time I can fix this. (Heading for the states 
next Tuesday)

Should we allow sub-classing of Function, but not overloading of eval?

Dr. Hake 

> Garth
> 
> It would prevent some
> 
> > debugging, I think.
> >
> > Kent
> >
> >
> > _______________________________________________
> > DOLFIN-dev mailing list
> > DOLFIN-dev@xxxxxxxxxx
> > http://www.fenics.org/mailman/listinfo/dolfin-dev
> 
> _______________________________________________
> DOLFIN-dev mailing list
> DOLFIN-dev@xxxxxxxxxx
> http://www.fenics.org/mailman/listinfo/dolfin-dev
>