Citerar Nicholas Miell <[email protected]>:
> On Thu, 2006-07-27 at 21:55 +0200, [email protected] wrote:
> > Citerar Nicholas Miell <[email protected]>:
> >
> > > 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
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