On 15 January 2017 at 11:56, Ian Lepore <i...@freebsd.org> wrote:
>
> What is the point of the !! in these macros? The expressions already
> have boolean type (even in C++ where it matters) due to the ==.
> Removing the !! would also make one level of parens redundant.
It's just a habit i picked up from linux-land. That way it really is
only 1 or 0, so things like debugging output and such make easier
sense.
It's also fixed a handful of bugs in the past (but I can't think of
exact cases right now) - primarily where other code expected 1 or 0
(for things like shifts into protocol fields) and the macro returns 0
or ${LARGEVAL}.
-adrian
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