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From: "Drew Adams" <drew.adams@oracle.com>
To: "'Mike Mattie'" <codermattie@gmail.com>, <help-gnu-emacs@gnu.org>
Subject: RE: is there an existing negate function ?
Date: Mon, 9 Mar 2009 23:36:54 -0700	[thread overview]
Message-ID: <005701c9a14a$9a8614a0$0200a8c0@us.oracle.com> (raw)
In-Reply-To: <20090309233840.GA8194@reforged>

> 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





      parent reply	other threads:[~2009-03-10  6:36 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
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 [this message]

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