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is there an existing negate function ?


From: Mike Mattie
Subject: is there an existing negate function ?
Date: Mon, 9 Mar 2009 16:38:40 -0700
User-agent: Mutt/1.5.16 (2007-06-09)

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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