Re: [RFC][PATCH] A generic boolean (version 6)

[ricknu-0]

Citerar Nicholas Miell <nmiell@xxxxxxxxxxx>:

> On Thu, 2006-07-27 at 21:55 +0200, ricknu-0@xxxxxxxxxxxxxx wrote:
> > Citerar Nicholas Miell <nmiell@xxxxxxxxxxx>:
> > 
> > > If _Bool does end up in the user-kernel ABI, be advised that validating
> > > them will be tricky ("b == true || b == false" or "!!b" won't work), and
> > 
> > Why would !!b not work?
> > I don't think it should end up in the ABI (at least, not yet). Just asking
> > because I'm curious. :)
> > 
> 
> The compiler knows that "b = !!b;" is a no-op.

In what gcc version? Using 4.0.2 myself and got that if b equals 12 (using a
pointer to add the value to the boolean) then !!b equals 1.

/Richard Knutsson
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/