On Fri, Jun 08, 2001 at 03:01:03AM -0700, Joaquin Cuenca Abela wrote:
>
> --- "R. Reucher" <[EMAIL PROTECTED]> wrote:
> > Andrew James Richardson wrote:
> >
> > > Brian,
> > >
> > > I thought that in the C specs you can't be
> > guarenteed the order of
> > > evaluation in an if brace. Surely a safer bet is
> > >
> > > if(!image){
> > > if(!image->Data){
> > > ...
> > > }
> > > }
> > You're right here. But as as long as you only READ
> > it should make no
> > difference (IMHO)...
>
> if it's right, it makes a big difference. If you try:
>
> if (!image->Data || !image)
>
> the program will segfault trying to access the member
> Data of a null pointer.
Exactly.
>
> Though I think that the order evaluation IS specified
> in the standard.
>
If it were C++ and you had overloaded those operators ...
it might change some of that picture. but even in this case,
with overload !, || operators C++ standard says that
that each operator must be evaluated.
> Cheers,
>
> --
> Joaquin Cuenca Abela
> [EMAIL PROTECTED]
>
>
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--
Zilvinas Valinskas
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