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: Comparing hash table objects Date: Sat, 11 Jun 2022 12:04:46 -0400 Message-ID: References: <871qvz4kdw.fsf@localhost> <87leu7tsyc.fsf@localhost> <878rq3d9wm.fsf@localhost> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="25586"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) Cc: rms@gnu.org, schwab@suse.de, emacs-devel@gnu.org To: Ihor Radchenko Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Jun 11 18:11:38 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 1o03i4-0006TW-BU for ged-emacs-devel@m.gmane-mx.org; Sat, 11 Jun 2022 18:11:36 +0200 Original-Received: from localhost ([::1]:45472 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1o03i3-0004Xe-AQ for ged-emacs-devel@m.gmane-mx.org; Sat, 11 Jun 2022 12:11:35 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:37164) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o03bd-0004Zh-JB for emacs-devel@gnu.org; Sat, 11 Jun 2022 12:05:00 -0400 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:23494) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o03ba-0007IV-UG; Sat, 11 Jun 2022 12:04:56 -0400 Original-Received: from pmg3.iro.umontreal.ca (localhost [127.0.0.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id C137744034C; Sat, 11 Jun 2022 12:04:52 -0400 (EDT) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 79D71441228; Sat, 11 Jun 2022 12:04:47 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1654963487; bh=rTNMj3tl8BE6VZv+UW+ZvrLp+Iir8cP13nTigIFJFjs=; h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=VOXklgv4rmKB0ayzt6t+TBGlCgU1gR6mQ6txPh/0C+ZT3y8G5owGDO0QgJppPiLrc ONvFWszhEmjZfPjosJwjiHI+IoKzDabkZBNZ72+jmKcURilADo3OigcQXwJ/fks9RU 7XkodNIdVY58JQbj8Rtr4ssfNX77xLNQPgGFgXjUahUSsJvYpB4Y+AK1W8ijuCLEVh wFGNJH5kEpy5PoYgLt/DYD2fG0Cbo27XhIyYUnxd67wiziiTQG4jhdI7N4XuuhZDuF 5EY+7iv1+RdssZBLZCz51N6zfTGdFz+lAWGqLeKZebC+mul1V24/a69yiQksCuBEgn dffn/Xunu4DsQ== Original-Received: from pastel (unknown [45.72.221.51]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 344451204E5; Sat, 11 Jun 2022 12:04:47 -0400 (EDT) In-Reply-To: <878rq3d9wm.fsf@localhost> (Ihor Radchenko's message of "Sat, 11 Jun 2022 13:52:25 +0800") 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, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham 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:291038 Archived-At: > However, it will not help with the problem of comparing objects > containing hash tables. Unless those obejcts also define special > comparison function (which is inconvenient). This is an instance of a fairly general problem with Lisp's equality tests (and it's not really specific to Lisp, admittedly). Maybe a half-sane way to solve this problem is to provide a generic "equality driver" which takes an argument specifying which objects to compare for structural equality (i.e. where to keep recursing). Stefan