From: Lars Ingebrigtsen <larsi@gnus.org>
To: Michael Heerdegen <michael_heerdegen@web.de>
Cc: Phil Sainty <psainty@orcon.net.nz>,
52290@debbugs.gnu.org, Stefan Monnier <monnier@iro.umontreal.ca>
Subject: bug#52290: 28.0.90; Undocumented generalized variables
Date: Sun, 05 Dec 2021 03:52:43 +0100 [thread overview]
Message-ID: <87ilw3u5j8.fsf@gnus.org> (raw)
In-Reply-To: <87ee6rbxfb.fsf@web.de> (Michael Heerdegen's message of "Sun, 05 Dec 2021 03:25:12 +0100")
Michael Heerdegen <michael_heerdegen@web.de> writes:
> I only wanted to note that some generalized vars might be more useful
> with `cl-letf' than with plain setf, you get some extra kinds of
> excursions gratis (sometimes doesn't work as expected though). Example:
>
> #+begin_src emacs-lisp
> (cl-letf (((cons (point-min) (point-max))
> (cons (line-beginning-position) (line-end-position))))
> (recursive-edit))
> #+end_src
That's... quote obscure. 😀
Being able to say `(decf (point))' seems kinda nice, but I think even
that is a bit on the obscure side. I.e., all the generalised variables
that are used for side effect (as opposed to mutating an explicit
object) are liable to cause confusion.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
next prev parent reply other threads:[~2021-12-05 2:52 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-05 1:25 bug#52290: 28.0.90; Undocumented generalized variables Phil Sainty
2021-12-05 1:35 ` Lars Ingebrigtsen
2021-12-05 1:55 ` Michael Heerdegen
2021-12-05 2:00 ` Lars Ingebrigtsen
2021-12-05 2:25 ` Michael Heerdegen
2021-12-05 2:52 ` Lars Ingebrigtsen [this message]
2021-12-05 16:17 ` Michael Heerdegen
2021-12-05 20:43 ` Lars Ingebrigtsen
2021-12-05 2:09 ` Phil Sainty
2021-12-05 2:46 ` Lars Ingebrigtsen
2022-08-21 22:36 ` Lars Ingebrigtsen
2022-08-23 0:07 ` Michael Heerdegen
2022-08-23 10:41 ` Lars Ingebrigtsen
2022-08-31 2:10 ` Michael Heerdegen
2022-08-31 9:58 ` Lars Ingebrigtsen
2022-10-04 11:58 ` Lars Ingebrigtsen
2021-12-06 4:33 ` Richard Stallman
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