Re: Mixing OO and DB

On Feb 14, 8:59 pm, David BL <davi..._at_iinet.net.au> wrote:
>
> ... variables can be read (as
> well as written), which means it isn't true that a pointer to an
> ellipse variable is a pointer to a circle variable.

The problem arises when you have all of:

1) mutability
2) first-class variables
3) subtyping

You can't pin the problem on any one of these; the problem is in the combination.

Marshall Received on Fri Feb 15 2008 - 10:27:16 CST