From: Mario Lang <mlang@blind.guru>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: EIEIO default constructor function
Date: Sun, 04 Apr 2021 10:39:42 +0200 [thread overview]
Message-ID: <87k0pi30kx.fsf@blind.guru> (raw)
In-Reply-To: <jwv7dliwxsx.fsf-monnier+emacs@gnu.org> (Stefan Monnier's message of "Sat, 03 Apr 2021 23:10:27 -0400")
Stefan Monnier <monnier@iro.umontreal.ca> writes:
>>> You might also consider using `cl-defstruct`, which
>>> doesn't suffer from such problems and is lighter weight.
>> I was actually trying that at first, but it turned out I need
>> inheritance based dynamic dispatch.
>
> I don't understand: cl-defmethod does inheritance-based dynamic
> dispatch for defstructs just as it does for defclasses.
Maybe I was using sloppy terminology, but as far as I can see, `cl-defstruct'
can not have a parent relationship, so what I call inheritance-based
dispatch isn't really possible with cl-defstruct?
(defclass foo () ())
(cl-defmethod val ((foo foo)) 0)
(defclass bar (foo) ())
(cl-defmethod val ((bar bar)) 1)
--
CYa,
⡍⠁⠗⠊⠕
next prev parent reply other threads:[~2021-04-04 8:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-03 3:50 EIEIO default constructor function Mario Lang
2021-04-03 13:48 ` Stefan Monnier
2021-04-04 2:42 ` Mario Lang
2021-04-04 3:10 ` Stefan Monnier
2021-04-04 8:39 ` Mario Lang [this message]
2021-04-04 14:12 ` Stefan Monnier
2021-04-08 3:37 ` Mario Lang
2021-04-08 4:44 ` Stefan Monnier
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