Messages in this thread | | | Date | Sat, 17 Nov 2012 15:38:41 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH v5 6/9] bug.h: Prevent double evaulation of in BUILD_BUG_ON |
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On Thu, Nov 15, 2012 at 01:11:15PM -0600, Daniel Santos wrote: > Ah yes. I did notice that at one point, but I think it slipped > my mind. Also, the kernel has introduced me to the usage of the > !! construct, of which I'm well versed in its affects in various > situations and how gcc's optimizer ends up treating its usage, so > probably another reason I didn't change it immediately. But it's > basically shorthand for the expression (condition ? 1 : 0), correct?
I don't think so: "!!" is simply a double negation which turns the whatever wild construct you have into either 0 or 1, depending on what it evaluates to.
But I don't know what the standard says so you'll have to check :-)
Thanks.
-- Regards/Gruss, Boris.
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