From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Lars Brinkhoff Newsgroups: gmane.emacs.devel Subject: What is a "sequence"? Date: Fri, 07 Apr 2017 15:07:54 +0200 Organization: nocrew Message-ID: <86r3142wnp.fsf_-_@molnjunk.nocrew.org> References: <86pogo4vty.fsf@molnjunk.nocrew.org> <8360igof0k.fsf@gnu.org> <867f2w4qdk.fsf@molnjunk.nocrew.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1491570536 21811 195.159.176.226 (7 Apr 2017 13:08:56 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 7 Apr 2017 13:08:56 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri Apr 07 15:08:50 2017 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cwTd5-0004aN-BS for ged-emacs-devel@m.gmane.org; Fri, 07 Apr 2017 15:08:43 +0200 Original-Received: from localhost ([::1]:50811 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cwTdB-0007Ka-6v for ged-emacs-devel@m.gmane.org; Fri, 07 Apr 2017 09:08:49 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:59240) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cwTcd-0007KS-6w for emacs-devel@gnu.org; Fri, 07 Apr 2017 09:08:16 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cwTcZ-0002Mf-6p for emacs-devel@gnu.org; Fri, 07 Apr 2017 09:08:15 -0400 Original-Received: from [195.159.176.226] (port=52467 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1cwTcZ-0002MP-0F for emacs-devel@gnu.org; Fri, 07 Apr 2017 09:08:11 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1cwTcH-0000Im-Px for emacs-devel@gnu.org; Fri, 07 Apr 2017 15:07:53 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 17 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:lTonHuAhVzb9zjOWDg3FLVkUbzQ= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 195.159.176.226 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 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.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:213744 Archived-At: Stefan Monnier wrote: >> I think there are only a few functions that wants a sequence but not a >> record: elt, copy-sequence, concat, reverse, and sort. In the context >> of structure operations, the most likely function would be copy-sequence. > > BTW, why not make copy-sequence and elt work on records? After all, > they are "sequences" (of fixed length and of heterogeneous values, but > still). Sure. I did consider copy-sequence, but then you added copy-record. I don't see a great need for elt, but it wouldn't hurt. Maybe it would be good for backward compatibility. In a similar vein, there are also some restrictions on what you can to to byte-code objects. You can do aref and concat and even mapcar, but not aset, and there's no function to make a copy. I guess a similar argument could be made that they're "sequences".