From: Tassilo Horn <tsdh@gnu.org>
To: Oleh <ohwoeowho@gmail.com>
Cc: help-gnu-emacs@gnu.org
Subject: Re: Any disadvantages of using put/get instead of defvar?
Date: Thu, 20 Feb 2014 23:24:33 +0100 [thread overview]
Message-ID: <87ob218lsu.fsf@thinkpad-t61.fritz.box> (raw)
In-Reply-To: <CAA01p3piw+0YGXqdACS4-u7FVe=GGmf=EtY5jC0=CU04i7zD7w@mail.gmail.com> (Oleh's message of "Thu, 20 Feb 2014 18:04:52 +0100")
Oleh <ohwoeowho@gmail.com> writes:
> The situation is that I have a function that uses one global variable.
> It's for sure that no other function will want this variable. In an
> effort to have all code in one place I want to move from:
>
> (defvar bar-foo 1)
> (defun bar ()
> ;; use bar-foo here
> )
>
> to:
>
> (defun bar ()
> (let ((foo (or (get 'bar 'foo) 1)))
> ;; use foo here
> ))
>
> So the advantage is that I can move and rename the function without
> worry that the function/variable coupling will break, because now
> everything is inside one function.
You could also define the variable inside the function, i.e., that's a
buffer-local counter:
(defun counter ()
(defvar counter-var 1)
(setq-local counter-var (1+ counter-var)))
Bye,
Tassilo
next prev parent reply other threads:[~2014-02-20 22:24 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-20 17:04 Any disadvantages of using put/get instead of defvar? Oleh
2014-02-20 22:24 ` Tassilo Horn [this message]
2014-02-21 1:40 ` Stefan Monnier
2014-02-21 10:29 ` Nicolas Richard
2014-02-21 13:57 ` Stefan Monnier
2014-02-21 11:49 ` Tassilo Horn
2014-02-21 14:41 ` Stefan Monnier
2014-02-21 9:12 ` Oleh
2014-02-21 9:39 ` Tassilo Horn
2014-02-21 9:44 ` Oleh
2014-02-21 9:51 ` Andreas Röhler
2014-02-21 9:56 ` Sebastian Wiesner
2014-02-21 11:56 ` Tassilo Horn
[not found] ` <mailman.15678.1392983787.10748.help-gnu-emacs@gnu.org>
2014-02-21 13:45 ` Helmut Eller
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