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: lexicographic list comparison Date: Mon, 12 Sep 2022 15:32:03 -0400 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="18335"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Mon Sep 12 21:33:16 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 1oXpBD-0004Yo-UT for ged-emacs-devel@m.gmane-mx.org; Mon, 12 Sep 2022 21:33:16 +0200 Original-Received: from localhost ([::1]:34906 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oXpBC-0002vF-BJ for ged-emacs-devel@m.gmane-mx.org; Mon, 12 Sep 2022 15:33:14 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:57646) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oXpAI-0002Au-DM for emacs-devel@gnu.org; Mon, 12 Sep 2022 15:32:18 -0400 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:13091) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oXpAG-00028k-3V for emacs-devel@gnu.org; Mon, 12 Sep 2022 15:32:17 -0400 Original-Received: from pmg2.iro.umontreal.ca (localhost.localdomain [127.0.0.1]) by pmg2.iro.umontreal.ca (Proxmox) with ESMTP id CAB1A807C3; Mon, 12 Sep 2022 15:32:12 -0400 (EDT) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg2.iro.umontreal.ca (Proxmox) with ESMTP id 79FE280401; Mon, 12 Sep 2022 15:32:11 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1663011131; bh=FBCoa+jAyFvXe6KRL6+e4BkaVEjnVVEDB/0/2MGCrns=; h=From:To:Subject:In-Reply-To:References:Date:From; b=OD1p1Ls2JhHLAcqfB4vIZ90UuSNzFnQx4e0oYcGSCtTC7w7xDhwUz+zC5ygd9hlB8 XD2IzYdbrFkoGubz7OoRw9S/HKNZ6iFvBPtLWnnFVpvHqqhGA0ydgqObkNN6dVKfOF jypkyu9NXJmRga4P7M3koss75GfG6fr9LhhA/z3zUIk2vWJ3C7p5D0cxvp4Dt5/BX7 SQ0t1iPC3CD5oRDdV3tDjPSF4ohpChCIUF8jTDGZ3yROBTv8asKMthOMqGQUzYNfny UaAo+PY9lTnuFsobhPg5mwLVe6ZUx5J6OAO4IJ9kuLhfI0agWbDVovgtgViZbjRErd waQ5JwtZaVkuQ== Original-Received: from pastel (unknown [157.52.9.190]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 5C4531209CD; Mon, 12 Sep 2022 15:32:11 -0400 (EDT) In-Reply-To: (Sam Steingold's message of "Mon, 12 Sep 2022 14:41:47 -0400") 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:295221 Archived-At: Sam Steingold [2022-09-12 14:41:47] wrote: >> * Stefan Monnier [2022-09-12 14:31:33 -0400]: >> [ Tho I suspect you'll want those comparison functions to return >> a -1/0/1 result rather than just a boolean, so you'd need an extra >> combinator to turn such a comparison function into the kind expected >> by `sort`. ] > > The predicate argument to lisp sort returns a boolean. Indeed, but `list-compare` will likely want the other kind, hence the need for combinators that change from kind to the other. Stefan