From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Zhu Zihao Newsgroups: gmane.emacs.devel Subject: Weak reference facility in Emacs. Date: Wed, 22 Jan 2020 22:11:02 +0800 Message-ID: <877e1jlgy1.wl-all_but_last@163.com> Mime-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="117796"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM/1.14.9 (=?ISO-8859-4?Q?Goj=F2?=) APEL/10.8 EasyPG/1.0.0 Emacs/28.0 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Jan 22 15:28:30 2020 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 1iuGzd-000UcD-Em for ged-emacs-devel@m.gmane-mx.org; Wed, 22 Jan 2020 15:28:29 +0100 Original-Received: from localhost ([::1]:42982 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iuGzc-0006q0-Eq for ged-emacs-devel@m.gmane-mx.org; Wed, 22 Jan 2020 09:28:28 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:59740) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iuGxs-00049k-Bg for emacs-devel@gnu.org; Wed, 22 Jan 2020 09:26:41 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iuGxn-0002HU-5P for emacs-devel@gnu.org; Wed, 22 Jan 2020 09:26:36 -0500 Original-Received: from m12-15.163.com ([220.181.12.15]:56482) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iuGxl-0001v2-Rr for emacs-devel@gnu.org; Wed, 22 Jan 2020 09:26:35 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=Date:Message-ID:From:Subject:MIME-Version; bh=dvmZ2 plLs8dx7H7m+FodAT35C3PxBk1hVMt/oeL91E8=; b=OWCIE1ZtT0ci9xpVIpzVA c0uw5digt0lUp2ZwrE4CvUuCfAwZSI040ZuCleonxCwFWzf6KsqpV6YndmmywEjD RlUSzysbnlsgyt3P7DKd3+4yFPJxjIhbS4icbDDM3xChKqxEZzQun83N1VJMFitL MKUA5ykelPb9SFu/fDOzew= Original-Received: from archlinux.163.com (unknown [14.121.133.181]) by smtp11 (Coremail) with SMTP id D8CowABH1k72VyheJQkIAA--.1463S2; Wed, 22 Jan 2020 22:11:10 +0800 (CST) X-Face: :]]%@R1{oDt0%iKgI@Kga#OZ; ogt+%OOne&J4#E*O,TIlI)yEFw--I\:3s~EV97GI$1.1!}8inmF9UgtUBB@#8>'8NWNC8qg/v*OLfQB; Z:@G3HeNf3u& ,&HpBGv%?p{bzsl'|5T";1&X X-CM-TRANSID: D8CowABH1k72VyheJQkIAA--.1463S2 X-Coremail-Antispam: 1Uf129KBjDUn29KB7ZKAUJUUUUU529EdanIXcx71UUUUU7v73 VFW2AGmfu7bjvjm3AaLaJ3UbIYCTnIWIevJa73UjIFyTuYvjxUIFApUUUUU X-Originating-IP: [14.121.133.181] X-CM-SenderInfo: pdoosuxxwbztlvw6il2tof0z/xtbBZh6yr1aD5JfBPQAAs- X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 220.181.12.15 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:244500 Archived-At: Weak reference is good idea to deal with cycle reference. Though Emacs has GC, but weak reference is also useful when I want to use RAII pattern in Emacs (via finalizer). hash table has option to make reference in it become weak. But it's not so convenience if user just want a weak reference of *ONE* lisp object. Would you interest in some lisp library to wrap a weak table to provide weak referenece utils. Or it's better to implement it in alloc.c?