Re: void * vs. T *

[Ark Khasin]

Eric Sosman wrote:
> > I mean a use of compile-time assert, like
> > extern int foo[(e)?1:-1];
> > e being the expression above. It's not for an #if.
>
>     For a compile-time "assert" you still need a constant
> expression.  In C90 you can't use a non-constant as an
> array dimension at all.  You can in C99 (in some contexts),
> but then you get a variable-length array and undefined
> behavior -- at run time, not compile time.

Please note that it's constant (1) or invalid (-1).