From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: [OFFTOPIC] Re: Appending lists Date: Thu, 17 Jun 2021 08:41:08 -0400 Message-ID: References: <87zgvs2bup.fsf@zoho.eu> <87y2bby1kr.fsf@zoho.eu> <20210615091834.GB24886@tuxteam.de> <87im2ewr3k.fsf@zoho.eu> <20210616072819.GB17919@tuxteam.de> <87r1h1vk0q.fsf@zoho.eu> <87tulxu4bc.fsf@zoho.eu> <877dits73y.fsf@zoho.eu> <20210617075433.GA19264@tuxteam.de> Reply-To: Stefan Monnier Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="11512"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:9TGQcg596ZZnvPtb09Ql85jGtMA= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Jun 17 15:02:26 2021 Return-path: Envelope-to: geh-help-gnu-emacs@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 1ltrf8-0002pe-Ic for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 17 Jun 2021 15:02:26 +0200 Original-Received: from localhost ([::1]:53446 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ltrf7-0002qa-IF for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 17 Jun 2021 09:02:25 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:38386) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ltrKf-0007lH-A8 for help-gnu-emacs@gnu.org; Thu, 17 Jun 2021 08:41:18 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:47468) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ltrKd-0007l3-N7 for help-gnu-emacs@gnu.org; Thu, 17 Jun 2021 08:41:17 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1ltrKb-0006ol-7r for help-gnu-emacs@gnu.org; Thu, 17 Jun 2021 14:41:13 +0200 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:130964 Archived-At: tomas@tuxteam.de [2021-06-17 09:54:33] wrote: > On Thu, Jun 17, 2021 at 01:49:21AM +0200, Emanuel Berg via Users list for > the GNU Emacs text editor wrote: >> Drew Adams wrote: >> >> >> What's a "deep copy"? > > [...] > >> deep copy = actual copy >> >> shallow copy = copy of references? > > Assignment = copy at depth 0 > Shallow copy = copy at depth 1 > ... > 42 copy = copy at depth 42 > ... > Deep copy = copy at depth infinite In the wonderful world of Haskell, of course, we have assignment is not allowed copy at depth 0 == copy at depth N == deep copy == no-op -- Stefan