From: Philip Kaludercic <philipk@posteo.net>
To: Michael Heerdegen <michael_heerdegen@web.de>
Cc: Emacs mailing list <help-gnu-emacs@gnu.org>
Subject: Re: Generic functions: Specializers like `or' or `memq'?
Date: Wed, 03 Nov 2021 18:21:43 +0000 [thread overview]
Message-ID: <87y265aymg.fsf@posteo.net> (raw)
In-Reply-To: <87r1bxcg6g.fsf@web.de> (Michael Heerdegen's message of "Wed, 03 Nov 2021 18:17:11 +0100")
Michael Heerdegen <michael_heerdegen@web.de> writes:
> Hello,
>
> I come back to this question again and again, so it's time to just ask:
>
> Often I want to use a certain method implementation for several very
> similar cases and want to avoid code duplication, but I don't know how
> to express this using the existing method specializers.
>
> For example, I want the `head' spec to match one of several symbols who
> are synonymous. Or instead of (eql SYM) I would rather want
> (memq (SYMS...)). Or I want to combine several SPECS using `or' because
> the implementation is the same.
>
> Am I'm missing something or - this is not possible currently, right?
> Would it be possible to implement such stuff then?
I haven't tried it myself, but it seems like you would have to use
cl-generic-generalizers (see cl-generic.el) to do so.
--
Philip Kaludercic
next prev parent reply other threads:[~2021-11-03 18:21 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-03 17:17 Generic functions: Specializers like `or' or `memq'? Michael Heerdegen
2021-11-03 18:21 ` Philip Kaludercic [this message]
2021-11-03 21:10 ` Michael Heerdegen
2021-11-03 21:32 ` Eric Abrahamsen
2021-11-03 23:19 ` Michael Heerdegen
2021-11-03 23:38 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-11-04 0:26 ` Michael Heerdegen
2021-11-04 1:31 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-11-04 2:34 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-11-04 4:01 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-11-06 22:32 ` Michael Heerdegen
2021-11-06 23:36 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-11-07 1:48 ` Michael Heerdegen
2021-11-21 19:43 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-11-23 8:16 ` Michael Heerdegen
-- strict thread matches above, loose matches on Subject: below --
2021-11-04 17:31 Eric Abrahamsen
2021-11-05 21:17 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-11-05 21:36 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-11-06 23:29 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-11-06 23:52 ` Emanuel Berg via Users list for the GNU Emacs text editor
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