* is there an existing negate function ?
@ 2009-03-09 23:38 Mike Mattie
2009-03-10 0:22 ` Juanma Barranquero
2009-03-10 6:36 ` Drew Adams
0 siblings, 2 replies; 3+ messages in thread
From: Mike Mattie @ 2009-03-09 23:38 UTC (permalink / raw)
To: help-gnu-emacs
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is there an existing negate function ? something like this
that I have no found ?
(defun negate ( value )
"negate VALUE
Invert the boolean sense of VALUE
0 -> 1
1 -> 0
"
(if value
nil
t))
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^ permalink raw reply [flat|nested] 3+ messages in thread* Re: is there an existing negate function ? 2009-03-09 23:38 is there an existing negate function ? Mike Mattie @ 2009-03-10 0:22 ` Juanma Barranquero 2009-03-10 6:36 ` Drew Adams 1 sibling, 0 replies; 3+ messages in thread From: Juanma Barranquero @ 2009-03-10 0:22 UTC (permalink / raw) To: Mike Mattie; +Cc: help-gnu-emacs > is there an existing negate function ? something like this > that I have no found ? > > (defun negate ( value ) > (if value > nil > t)) `null' (or its alias, `not'). Juanma ^ permalink raw reply [flat|nested] 3+ messages in thread
* RE: is there an existing negate function ? 2009-03-09 23:38 is there an existing negate function ? Mike Mattie 2009-03-10 0:22 ` Juanma Barranquero @ 2009-03-10 6:36 ` Drew Adams 1 sibling, 0 replies; 3+ messages in thread From: Drew Adams @ 2009-03-10 6:36 UTC (permalink / raw) To: 'Mike Mattie', help-gnu-emacs > is there an existing negate function ? something like this > that I have no found ? > > (defun negate ( value ) > "negate VALUE - Invert the boolean sense of VALUE > 0 -> 1 > 1 -> 0" > (if value nil t)) I'll bite. ;-) Is `not' (aka `null') what you mean? (not nil) -> t (not 'non-nil) -> nil ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2009-03-10 6:36 UTC | newest] Thread overview: 3+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2009-03-09 23:38 is there an existing negate function ? Mike Mattie 2009-03-10 0:22 ` Juanma Barranquero 2009-03-10 6:36 ` Drew Adams
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