From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: Edit a cl-struct by copy, or, slot-value for cl-structs Date: Fri, 29 Oct 2021 15:15:45 -0400 Message-ID: References: <06C2AE7C-C3E9-4E34-9394-B431173639E9@gmail.com> Reply-To: Stefan Monnier Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="39433"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:Pz+mQLwJz91DGhSSh16yClSnjHM= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Oct 29 21:30:24 2021 Return-path: Envelope-to: geh-help-gnu-emacs@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 1mgXa3-000A6e-M4 for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 29 Oct 2021 21:30:23 +0200 Original-Received: from localhost ([::1]:45772 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mgXa2-0007F5-LN for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 29 Oct 2021 15:30:22 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:53924) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mgXM4-00061l-3b for help-gnu-emacs@gnu.org; Fri, 29 Oct 2021 15:15:59 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:49358) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mgXM2-0005Xr-3l for help-gnu-emacs@gnu.org; Fri, 29 Oct 2021 15:15:55 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1mgXLy-00017q-FB for help-gnu-emacs@gnu.org; Fri, 29 Oct 2021 21:15:50 +0200 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:134268 Archived-At: > (mapcar #'cl--slot-descriptor-name > (cl--struct-class-slots (get (type-of obj) 'cl--class))) > > But I can’t get any further as I can’t find any generic getter and > setter for cl-struct’s. Something like slot-value. So close! The position of the slot descriptor in `cl--struct-class-slots` mirrors the position of the slot in the actual objet, so you just need `aref/aset`. It would also make a lot of sense to replace/extend the useless `:copier` thingy of `cl-defstruct` with something like the `:constructor`, so you could say (cl-defstruct (my-foo (:copier my-foo-with) (:copier my-foo-with-a (b a))) a b c) and then use (my-foo-with foo :c 42) and (my-foo-with-a foo 153 "42") Stefan