On 05.07 Helge Hafting wrote:
> Tobias Ringstrom wrote:
> >
> > On Sun, 6 May 2001, David S. Miller wrote:
> > > It is the most straightforward way to make a '1' or '0'
> > > integer from the NULL state of a pointer.
> >
> > But is it really specified in the C "standards" to be exctly zero or one,
> > and not zero and non-zero?
>
> !0 is 1. !(anything else) is 0. It is zero and one, not
> zero and "non-zero". So a !! construction gives zero if you have
> zero, and one if you had anything else. There's no doubt about it.
> >
Isn't this asking for trouble with the optimizer ? It could kill both
!!. Using that is like trusting on a certain struct padding-alignment.
-- J.A. Magallon # Let the source be with you... mailto:jamagallon@able.es Linux Mandrake release 8.1 (Cooker) for i586 Linux werewolf 2.4.4-ac5 #1 SMP Sat May 5 01:17:07 CEST 2001 i686- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Mon May 07 2001 - 21:00:25 EST