BUG

[Martin v. Loewis]

> //  I compile this file and I obtain: 
> //   deivadas.C:27: sorry, not implemented: adjusting pointers for covariant returns
> // The line is the unique // in code.
> // The problem is : NOT COMPILE AND IT SHOULD return ERROR OVERLOADING FUNCTION ...
> // OR anything shuch this.

Thanks for your bug report. Your code is really correct: D::Open()
really overrides D2D::Open. This is called "covariant return types",
and it means that the derived class can return a derived pointer from
the virtual function. As g++ explains, it does not support that
particular case, and it is therefore sorry.

Hope this helps,
Martin