kent-...@simula.no 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.

Garth

It would prevent some
> debugging, I think.
> 
> Kent
> 
> 
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