From: Stefan Monnier via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
To: help-gnu-emacs@gnu.org
Subject: Re: Generic functions: Specializers like `or' or `memq'?
Date: Sat, 06 Nov 2021 19:29:02 -0400 [thread overview]
Message-ID: <jwvv914amqi.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: 87ilx6qo86.fsf@zoho.eu
Emanuel Berg via Users list for the GNU Emacs text editor [2021-11-05 22:36:25] wrote:
> Stefan Monnier via Users list for the GNU Emacs text editor wrote:
>>> My earliest confusion began when I decided that if I could
>>> find the part of the code that runs the `eql' specializer
>>> (or do we call it the `eql' generalizer?) and then worked
>>> back from there, I would be able to make sense of
>>> everything. But I couldn't even find the bit of code that
>>> looks like (eql <val> <tag>)! And still can't.
>>
>> Nah, that would be too easy. Instead it happens implicitly
>> via a lookup in a hash-table.
>>
>> I suspect that the code for cl-defstruct specializer might
>> be easier to understand in this respect.
>
> What's the typical use case for this?
Not sure what "this" refers to. If you're talking about the use case
for adding new specializers/generalizers, it's quite rare.
It's mostly a detail of `cl-generic.el` used internally.
Stefan
next prev parent reply other threads:[~2021-11-06 23:29 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-04 17:31 Generic functions: Specializers like `or' or `memq'? 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 [this message]
2021-11-06 23:52 ` Emanuel Berg via Users list for the GNU Emacs text editor
-- strict thread matches above, loose matches on Subject: below --
2021-11-03 17:17 Michael Heerdegen
2021-11-03 18:21 ` Philip Kaludercic
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
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