From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Drew Adams <drew.adams@oracle.com>
Cc: Daniel Mendler <mail@daniel-mendler.de>,
"47992@debbugs.gnu.org" <47992@debbugs.gnu.org>,
"jakanakaevangeli@chiru.no" <jakanakaevangeli@chiru.no>
Subject: bug#47992: [External] : bug#47992: 27; 28; Phase out use of `equal` in `add-hook`, `remove-hook`
Date: Sun, 25 Apr 2021 09:52:45 -0400 [thread overview]
Message-ID: <jwv8s56wka4.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <SA2PR10MB4474E9655EF4531872980181F3439@SA2PR10MB4474.namprd10.prod.outlook.com> (Drew Adams's message of "Sun, 25 Apr 2021 04:57:07 +0000")
> Read what I said about _real_ functions, which is whose
> equality is undecidable.
`add/remove-hook` sadly lives in the real world.
> As contrasted with the equality of Lisp "functions", represented as
> symbols, strings, or lambda forms.
Strings aren't used to represent functions in Lisp, and the case of
lambda-forms is the case that's actually causing real performance
problems in add/remove-hook (both interpreted and compiled).
So, yes, symbols is the only option remaining, to enforce the `eq`
semantics which seems to be at least as often what we want and doesn't
suffer from performance problems.
> The latter is certainly decidable, and it's what we use in
> `remove-hook' to decide.
My comment about decidability was just a side remark that doesn't really
matter for this decision. I now regret mentioning it.
Stefan
next prev parent reply other threads:[~2021-04-25 13:52 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-24 12:11 bug#47992: 27; 28; Phase out use of `equal` in `add-hook`, `remove-hook` Daniel Mendler
2021-04-24 20:12 ` bug#47992: [External] : " Drew Adams
2021-04-24 20:23 ` Daniel Mendler
2021-04-24 21:20 ` Drew Adams
2021-04-24 21:34 ` Daniel Mendler
2021-04-24 22:30 ` Stefan Monnier
2021-04-24 22:38 ` Daniel Mendler
2021-04-24 23:04 ` Stefan Monnier
2021-04-24 23:38 ` Daniel Mendler
2021-04-25 1:16 ` Drew Adams
2021-04-25 3:08 ` Stefan Monnier
2021-04-25 4:57 ` Drew Adams
2021-04-25 13:52 ` Stefan Monnier [this message]
2021-04-25 1:16 ` Drew Adams
2021-04-25 1:23 ` Drew Adams
2021-04-25 3:10 ` Stefan Monnier
2021-04-25 4:57 ` Drew Adams
2021-04-25 10:33 ` Daniel Mendler
2021-04-25 13:56 ` Stefan Monnier
2021-05-02 9:09 ` Lars Ingebrigtsen
2021-05-02 10:37 ` Daniel Mendler
2021-05-03 8:50 ` Lars Ingebrigtsen
2021-07-06 14:44 ` Olivier Certner
[not found] ` <877di6udfy.fsf@web.de>
2021-07-04 1:09 ` Lars Ingebrigtsen
2021-07-04 2:35 ` Michael Heerdegen
2021-07-04 2:56 ` Lars Ingebrigtsen
2021-07-04 4:28 ` Michael Heerdegen
2021-07-04 13:36 ` Lars Ingebrigtsen
2021-07-04 17:08 ` bug#47992: [External] : " Drew Adams
2021-07-04 22:45 ` Michael Heerdegen
2021-07-05 12:39 ` Lars Ingebrigtsen
2021-07-06 1:48 ` Richard Stallman
2021-07-06 2:37 ` bug#47992: [External] : " Drew Adams
2021-07-06 3:21 ` Michael Heerdegen
2021-07-07 23:57 ` Richard Stallman
2021-07-06 9:46 ` Arthur Miller
2021-07-07 23:57 ` Richard Stallman
2021-07-08 2:11 ` Arthur Miller
2021-07-04 23:15 ` Michael Heerdegen
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