From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Dmitry Gutov Newsgroups: gmane.emacs.devel Subject: Re: Opaque objects and Emacs documentation Date: Tue, 21 Jul 2020 23:56:41 +0300 Message-ID: References: <20200712184908.13140.5739@vcs0.savannah.gnu.org> <20200712184909.BBC61209B1@vcs0.savannah.gnu.org> <7bf4d6ef-c0ec-43dc-ad5d-f6e81422ad90@yandex.ru> <83zh84m5ws.fsf@gnu.org> <3dd1c224-69b2-40af-5b2e-43a310253632@yandex.ru> <83tuybmtxs.fsf@gnu.org> <859f594b-1343-6d26-e1ac-7157c44eb56c@yandex.ru> <83a6zyk4tt.fsf@gnu.org> <6edffb7d-7708-534f-93ad-bf9180f5e0ed@yandex.ru> <835zamjsvk.fsf@gnu.org> <831rlajock.fsf@gnu.org> <1fcdc463-b3ab-2d32-31d7-904783ae0d81@yandex.ru> <83y2nii6sk.fsf@gnu.org> <750ecd90-0f89-5040-f737-2d8c1b8f01c9@yandex.ru> <83tuy3h87j.fsf@gnu.org> <412b0e60-7ccb-ee72-b361-566710156365@yandex.ru> <83v9igfyo1.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="20614"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 Cc: rms@gnu.org, emacs-devel@gnu.org To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Tue Jul 21 22:57:30 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 1jxzKM-0005H0-H0 for ged-emacs-devel@m.gmane-mx.org; Tue, 21 Jul 2020 22:57:30 +0200 Original-Received: from localhost ([::1]:60884 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jxzKL-0002mW-Da for ged-emacs-devel@m.gmane-mx.org; Tue, 21 Jul 2020 16:57:29 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:47866) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jxzJh-0002Jx-VO for emacs-devel@gnu.org; Tue, 21 Jul 2020 16:56:50 -0400 Original-Received: from mail-wm1-x329.google.com ([2a00:1450:4864:20::329]:55280) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jxzJg-0003DL-65; Tue, 21 Jul 2020 16:56:49 -0400 Original-Received: by mail-wm1-x329.google.com with SMTP id o8so4109843wmh.4; Tue, 21 Jul 2020 13:56:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=06WOw+xEC+/jmI3LkS1gXVLJOKF+SDDsuy9gOl4+SjQ=; b=ELU6uEgQre1tEbU40TJ/uAmxMlgxN6OB+C5+SxfqtzyHRdAERpl5OefOoB9tVKWf8w fN3zpe8Lf5y2GJTXmrVkVrLAbOSlJwac9xtjBjV19uUJlxRXsdUtFW1gkipSZ7kZoem7 moiIiv/Bvhb4mxlmyIvAkW736SSXAvtAVXvoEpVp2fiQIQiMG6txvgTO/r2njOz+0sRC HLfNhZOtdZZ7QBbAZbvy+CsWo5aELQjbeWJ07K3FLdzt367y+4gtO/rbIRBplw6HUP+A ZZQym1QL71GJyb2Hu0oTEkqFWx0ENrx6a5jaMy/hRPG8wWN3XIaBRoKBFv82KMHW7vdS gw7g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:subject:to:cc:references:from:message-id :date:user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=06WOw+xEC+/jmI3LkS1gXVLJOKF+SDDsuy9gOl4+SjQ=; b=jL2+GZsVfhNrodfZliyMgxmIbhTkdqxfaPSWAo0IIDzXSynhfzjRHGodqo9HdmLpt+ P7280537y0gWUMt2TXc1hruw3pWJAO2p/aug81CNnHar55xUwJgW0adR1eTvddSWV6P9 J/z+TeJxHaqeTL3EIVtZyWLIVLN5NjvmbhK7rA/r6L48jpCwCY/gmN81IdArLWbrG2/H /CrxLgcVZdIwYWQOZi5R344LqEEH9PHtKOrijYI87xkZgFm7uIdJzUzUWVfrW9iKmeyo djXaT2r7xgRuen8Ie7BCqLQTlbKCEyW0Kz1XHjUVrwPZ0ugq5VyDnEOFEisuOXemiw2l 1Hkg== X-Gm-Message-State: AOAM533lc4zeBC2nlnvAerAMknascWa2XhRTclrAudVn37EyOPkKl5YV jfIW6rnTFS/VcxiRNfyWOVy7fd8a X-Google-Smtp-Source: ABdhPJz2dRq3WaVjKH1RaFZNZQ55KT96M+6QeYg/30Pd0tH228CSW6BPYK7QBCVLjO3oUnUTTSQT1g== X-Received: by 2002:a1c:6706:: with SMTP id b6mr5314742wmc.167.1595365005459; Tue, 21 Jul 2020 13:56:45 -0700 (PDT) Original-Received: from [192.168.0.3] ([66.205.73.129]) by smtp.googlemail.com with ESMTPSA id r8sm38552686wrp.40.2020.07.21.13.56.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 21 Jul 2020 13:56:43 -0700 (PDT) In-Reply-To: <83v9igfyo1.fsf@gnu.org> Content-Language: en-US Received-SPF: pass client-ip=2a00:1450:4864:20::329; envelope-from=raaahh@gmail.com; helo=mail-wm1-x329.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: 0 X-Spam_score: 0.0 X-Spam_bar: / X-Spam_report: (0.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=1, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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:253144 Archived-At: On 21.07.2020 22:36, Eli Zaretskii wrote: >> A predicate would look like: >> >> (defun project-instance-p (pr) >> (condition-case nil >> (progn >> (project-roots pr) >> t) >> (error >> nil))) > > I actually thought about cl-defgeneric etc., since obviously each type > of project should have its own implementation. There's no point. If it implements project-root, it's a project. >> But I don't see how it's going to help you write documentation. > > It makes the object system more complete. Suppose some application > would like to check it gets a valid object, before dispatching? I can imagine some marginal utility in that, but not enough to mandate every backend to implement a project-instance-p method which simply returns t. >>> . a function to compare two objects of this type >> >> As discussed, it's a little function called 'equal'. > > Again, I envisioned a cl-defgeneric here. Using 'equal' only works > for simple forms, Lists, cl-structs, eieio classes, etc, can also be equal.