From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: EIEIO default constructor function Date: Sun, 04 Apr 2021 10:12:48 -0400 Message-ID: References: <87y2e0rppp.fsf@blind.guru> <87ft06bwip.fsf@blind.guru> <87k0pi30kx.fsf@blind.guru> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="5547"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: emacs-devel@gnu.org To: Mario Lang Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sun Apr 04 16:13:43 2021 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lT3VX-0001Mr-Ke for ged-emacs-devel@m.gmane-mx.org; Sun, 04 Apr 2021 16:13:43 +0200 Original-Received: from localhost ([::1]:53142 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lT3VW-0005g7-Jk for ged-emacs-devel@m.gmane-mx.org; Sun, 04 Apr 2021 10:13:42 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:48066) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lT3Us-0005DX-Du for emacs-devel@gnu.org; Sun, 04 Apr 2021 10:13:03 -0400 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:9232) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lT3Un-0000Ki-Kf for emacs-devel@gnu.org; Sun, 04 Apr 2021 10:13:01 -0400 Original-Received: from pmg3.iro.umontreal.ca (localhost [127.0.0.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id C3C264409C9; Sun, 4 Apr 2021 10:12:56 -0400 (EDT) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 8CE63440987; Sun, 4 Apr 2021 10:12:55 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1617545575; bh=RfaTKuNs9JE1l9w98ezNLbHIdFRoFxPmVQOmkcsht8E=; h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=E8sJhYNj80EWLpl/vmPplO9z8M1XUeujxtZfFFC4T5OfFKDNvl/PEn7Y1VkFznFpy PBO0rEkc0r+uHBJhqM3TavI7L7vK3Vr/oV3IYBm7Ey9q20zbYY5lRqFGMfvZ2LI9fH bTzcRQNXWsiEuet/Qh7HFHYLYwGhOTZL3L1B88PnwdnhxcH1X6bXqGxkVOltJD7o6B u5rXNgER6KjlTagGN4h96pG+1XWNsBz0VTxLo3Q5GV16Rq9//DJbap/FoJUmgdQejG 3mdhB7o5jQIN711sDpZkmukeU345U/RqU6/jNcS+Q8M5DB5S6keXFopxgTE4x4U3ec S9exMLLv7e4BQ== Original-Received: from alfajor (104-222-126-84.cpe.teksavvy.com [104.222.126.84]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id F04561202BC; Sun, 4 Apr 2021 10:12:54 -0400 (EDT) In-Reply-To: <87k0pi30kx.fsf@blind.guru> (Mario Lang's message of "Sun, 04 Apr 2021 10:39:42 +0200") Received-SPF: pass client-ip=132.204.25.50; envelope-from=monnier@iro.umontreal.ca; helo=mailscanner.iro.umontreal.ca X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:267389 Archived-At: > 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) (cl-defstruct (my-foo) slot1) (cl-defmethod my-val ((x my-foo)) (my-foo-slot1 x)) (cl-defstruct (my-bar (:include my-foo)) slot2) (cl-defmethod my-val ((x my-bar)) (+ (my-bar-slot2 x) (cl-call-next-method))) (my-val (make-my-bar :slot1 4 :slot2 5)) ==> 9 -- Stefan