Time to standardize "true" and "false"

[Norman Diamond]

>From article <12070 at cit-vax.Caltech.Edu>, by wen-king at cit-vax.Caltech.Edu (King Su):

>> #define bool(a) (!!(a))
>> Then just use bool(X) whenever you wanted to use (bool)X.

In article <8862 at etana.tut.fi> pl at etana.tut.fi (Lehtinen Pertti) writes:

>	Then suddenly just behind the corner comes C-compiler from
>	ACME-corporation and realizes '!!a' -> negation of negation is
>	same as original -> we can optimize it away.

Actually no.  If the optimizer reduces this to a no-op without knowing
that "a" must already be 0 or 1, then the optimizer is broken.  "!"
was required to produce a result of 0 or 1 even before K&R-1.

-- 
Norman Diamond, Sony Corporation (diamond at ws.sony.junet)
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