Messages in this thread | | | Date | Fri, 28 Jul 2006 03:29:55 +0200 | From | ricknu-0@student ... | Subject | Re: [RFC][PATCH] A generic boolean (version 6) |
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Citerar Nicholas Miell <nmiell@comcast.net>:
> On Thu, 2006-07-27 at 21:55 +0200, ricknu-0@student.ltu.se wrote: > > Citerar Nicholas Miell <nmiell@comcast.net>: > > > > > 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.
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