From: "Drew Adams" <drew.adams@oracle.com>
To: "'Decebal'" <CLDWesterhof@gmail.com>, <help-gnu-emacs@gnu.org>
Subject: RE: Working with constansts
Date: Sun, 10 May 2009 09:31:07 -0700 [thread overview]
Message-ID: <000701c9d18c$b905c700$0200a8c0@us.oracle.com> (raw)
In-Reply-To: <a7eb61a0-63aa-4168-a193-1669663f8aa6@r34g2000vbi.googlegroups.com>
> I would like to work with constants in my elisp code. I thought that I
> could do this with defconst, but that doen not work.
> After: (defconst dummy "testing")
> The variable dummy has the value "testing".
> But after: (setq dummy "changed")
> The variable dummy has the value "changed".
> What am I doing wrong.
From the Elisp manual:
"The difference between `defconst' and `defvar' is primarily a matter
of intent, serving to inform human readers of whether the value should
ever change. Emacs Lisp does not restrict the ways in which a variable
can be used based on `defconst' or `defvar' declarations. However, it
does make a difference for initialization: `defconst' unconditionally
initializes the variable, while `defvar' initializes it only if it is
void."
Nothing prevents a user or program from changing the value of a `defconst'
variable. Unless you somehow cripple Emacs Lisp, you can always find a way to
modify something. That's about the only constant. ;-)
prev parent reply other threads:[~2009-05-10 16:31 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-10 15:25 Working with constansts Decebal
2009-05-10 16:19 ` Pascal J. Bourguignon
2009-05-10 16:20 ` Richard Riley
2009-05-10 16:33 ` Pascal J. Bourguignon
2009-05-12 10:34 ` Nikolaj Schumacher
2009-05-10 17:02 ` Drew Adams
2009-05-10 17:28 ` Richard Riley
2009-05-11 7:39 ` Tassilo Horn
[not found] ` <mailman.6953.1241976532.31690.help-gnu-emacs@gnu.org>
2009-05-10 18:17 ` Pascal J. Bourguignon
2009-05-11 1:36 ` Richard Riley
2009-05-11 6:29 ` Pascal J. Bourguignon
2009-05-12 10:06 ` Nikolaj Schumacher
[not found] ` <mailman.7056.1242122790.31690.help-gnu-emacs@gnu.org>
2009-05-12 11:54 ` Pascal J. Bourguignon
2009-05-18 10:55 ` Nikolaj Schumacher
[not found] ` <7ceiuuczad.fsf@pbourguignon.informatimago.com>
[not found] ` <mailman.7379.1242644154.31690.help-gnu-emacs@gnu.org>
2009-05-18 12:20 ` Pascal J. Bourguignon
2009-05-18 19:19 ` Nikolaj Schumacher
2009-05-10 18:59 ` Barry Margolin
2009-05-11 1:38 ` Richard Riley
2009-05-12 9:44 ` Nikolaj Schumacher
[not found] ` <mailman.7052.1242121473.31690.help-gnu-emacs@gnu.org>
2009-05-12 11:43 ` Pascal J. Bourguignon
2009-05-13 4:59 ` Barry Margolin
2009-05-13 13:41 ` Ralf Wachinger
2009-05-13 21:23 ` Barry Margolin
2009-05-11 9:58 ` Thien-Thi Nguyen
[not found] ` <mailman.6988.1242036217.31690.help-gnu-emacs@gnu.org>
2009-05-12 1:31 ` Barry Margolin
2009-05-11 8:27 ` Decebal
2009-05-12 9:46 ` Nikolaj Schumacher
2009-05-10 16:31 ` Drew Adams [this message]
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