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: Re: cl-lib questions Date: Wed, 21 Jul 2021 17:59:52 -0400 Message-ID: References: <87sg1dgbbk.fsf@omarpolo.com> <87pmwhg843.fsf@omarpolo.com> <8735t96mxj.fsf@omarpolo.com> <87pmw961ox.fsf@zoho.eu> <874kcpxln9.fsf@logand.com> <87pmvcdgqg.fsf@t14.reltub.ca> <87a6mgwz17.fsf@logand.com> <87tukno4s8.fsf@t14.reltub.ca> <87mtqfuysy.fsf_-_@zoho.eu> 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="25911"; 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:rXMI39L1elQn9zyHpdp9iBI7MIs= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Jul 22 00:01:16 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 1m6KHE-0006gR-7D for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 22 Jul 2021 00:01:16 +0200 Original-Received: from localhost ([::1]:49660 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m6KHD-0002wZ-7y for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 21 Jul 2021 18:01:15 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:37512) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m6KG1-0002wP-Jm for help-gnu-emacs@gnu.org; Wed, 21 Jul 2021 18:00:01 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:34660) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m6KG0-0003jA-02 for help-gnu-emacs@gnu.org; Wed, 21 Jul 2021 18:00:01 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1m6KFx-00051Z-9T for help-gnu-emacs@gnu.org; Wed, 21 Jul 2021 23:59:57 +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=0.248, 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:131980 Archived-At: > Can you perhaps say a couple of words on the intended use for > `setf', I get it it is a generic function (macro) but is there > in your mind say one or two typical use cases or something > like that to exemplify? A typical example for me is when you want to modify the field of a struct: (cl-defstruct my-foo a b c) then you can set the field `b` of a my-foo struct X to value V with: (setf (my-foo-b X) V) I also like to (ab)use it for things like (push (make-new-element) (if (something) x y)) > Also, what is the difference between setf and `setq' with > respect to setting `let'/`let*' variables? None. > Another cl-lib question is the type of clause usable with > `cl-loop' that are described like this in the docstring: I wouldn't know, I never use `cl-loop`. Stefan