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: problems of everyday life Date: Wed, 16 Nov 2022 22:04:18 -0500 Message-ID: References: <87r0y4w8hy.fsf@dataswamp.org> <86v8nfuyl6.fsf@mail.linkov.net> <87sfijf6b5.fsf@disroot.org> 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="18898"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:T5hHKpNil4m+PzY7j9u1HeqIeMk= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Nov 17 04:05:18 2022 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 1ovVDJ-0004fW-Uy for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 17 Nov 2022 04:05:17 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ovVCb-00075H-FJ; Wed, 16 Nov 2022 22:04:33 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ovVCX-00074z-4T for help-gnu-emacs@gnu.org; Wed, 16 Nov 2022 22:04:29 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ovVCV-0008Vt-HW for help-gnu-emacs@gnu.org; Wed, 16 Nov 2022 22:04:28 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1ovVCS-0003O1-Sz for help-gnu-emacs@gnu.org; Thu, 17 Nov 2022 04:04:24 +0100 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: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, 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: 2.1.29 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-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:141028 Archived-At: Reminds me of those analog logic circuits which use "standard" digital gates but represent analog values as durations during which a signal is asserted, so you can implement the `max` and `min` functions with `or` and `and` gates respectively. Stefan Akib Azmain Turja [2022-11-16 18:10:54] wrote: > Juri Linkov writes: > >>> or maybe >>> >>> (apply #'+ '(5 7 10)) >>> >>> or ... well, what do you prefer? >> >> This reminds the implementation of sleep sort: >> >> (dolist (i '(3 1 4 1 5 92 65 3 5 89 79 3)) >> (run-with-timer (* i 0.001) nil 'message "%d" i)) >> >> The sorted output printed in the *Messages* buffer: >> >> 1 [2 times] >> 3 [3 times] >> 4 >> 5 [2 times] >> 65 >> 79 >> 89 >> 92 >> > > Someone implemented addition using sleep. Now I have implemented > subtraction: > > --8<---------------cut here---------------start------------->8--- > (defun subtract (x y) > (when (< y x) > (let ((tmp x)) > (setq x y) > (setq y tmp))) > (let ((time-a (current-time))) > (sleep-for x) > (let ((time-b (current-time))) > (while (< (float-time (time-subtract nil time-a)) y) > (sleep-for 0.9)) > (floor (float-time (time-subtract nil time-b)))))) > > (subtract 0 1) ; => 1 > (subtract 3 5) ; => 2 > --8<---------------cut here---------------end--------------->8---