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: using finalizers Date: Sat, 01 Jan 2022 15:47:24 -0500 Message-ID: References: <878rw1pvcw.fsf@logand.com> <875yr5p9t3.fsf@logand.com> <877dbjkxui.fsf@logand.com> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="19968"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) Cc: LdBeth , emacs-devel@gnu.org To: Tomas Hlavaty Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Jan 01 21:48:21 2022 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 1n3lIa-00050E-Rd for ged-emacs-devel@m.gmane-mx.org; Sat, 01 Jan 2022 21:48:21 +0100 Original-Received: from localhost ([::1]:33262 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1n3lIZ-0002U2-8W for ged-emacs-devel@m.gmane-mx.org; Sat, 01 Jan 2022 15:48:19 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:46748) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n3lHt-0001nk-Pa for emacs-devel@gnu.org; Sat, 01 Jan 2022 15:47:38 -0500 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:42698) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n3lHr-0007m9-41 for emacs-devel@gnu.org; Sat, 01 Jan 2022 15:47:36 -0500 Original-Received: from pmg3.iro.umontreal.ca (localhost [127.0.0.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 573E9441435; Sat, 1 Jan 2022 15:47:33 -0500 (EST) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 28801441431; Sat, 1 Jan 2022 15:47:32 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1641070052; bh=E1g30eimuIBY5f1vLo2OoJrSRHmO10NXAUMvXXcrszA=; h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=ch/EkmXbACRhsEbO6pckM4rzS+UVsVxl9tuF+g5lQLveGtNwE4X3adq65sr8NhQMh dMrTOZqRjZpT3VM4ttnigMnSQtbSNXCnf1huFRmrQ/C9LUmYagrIdvdBbzb2IiIUYQ PqvB7WYBgQljOQA97S85JI4NsknSNSqckFjdB857BcE0hStHRBH0nEUAFp/gQD6qjw FfnHkVZRT7vf5jY0DwyqReM3JVMF7upXONYDuuu3q14t3SZjrJychTsjdijOO/3WV1 FOKCw5cTNmTHRmB7D5SpY4CiOPMJ1zXfaBjMLkES8zt5xfWODicO/RBOuUwIH0+nLE hUw7JL53804Lg== Original-Received: from ceviche (unknown [216.154.30.173]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id F0A311203DD; Sat, 1 Jan 2022 15:47:31 -0500 (EST) In-Reply-To: <877dbjkxui.fsf@logand.com> (Tomas Hlavaty's message of "Sat, 01 Jan 2022 21:25:09 +0100") Received-SPF: pass client-ip=132.204.25.50; envelope-from=monnier@iro.umontreal.ca; helo=mailscanner.iro.umontreal.ca X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 5.0 requ) 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=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 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:283818 Archived-At: > In Emacs Lisp, the semantics is: call this thunk when the returned > finalizer gets collected. So, if I want to finalize my object, I have > too keep the reference to the finalizer. That's right: if you want an object to have a finalizer, you need to save that finalizer somewhere inside the object. IOW the object literally "has a finalizer" somewhere inside. There's no doubt that it's different. Do you have concrete cases where this difference introduces a difficulty? Stefan