class/subclass ivars

[Riccardo Mottola]

Hi,

I have a simple question and I am unsure about the answer.

Suppose we have class A with an ivar _var.

Now, I subclass A with B. Since I don't know the declaration of A, I 
also need an ivar and call it _var and they probably have the same type.

What happens? Do I get a compiler error? Does the compiler smartly 
renames the two variables like _var_A and _var_B? Does the second 
declaration get ignored and the code refers to the same variable? I 
would expect the  renaming behaviour, but the latter also makes

I wonder if there is risk calling vars like "_size" or "width" "height" 
which have common names enough to be declared up in the hierarchy.
I am debugging code that works on Mac and not on GS, so I got the doubt.

Riccardo