From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: "Stephen J. Turnbull" Newsgroups: gmane.emacs.devel Subject: Re: Generators (iterators) for Gnu Emacs Date: Sat, 06 Dec 2014 18:38:51 +0900 Message-ID: <87sigtjexg.fsf@uwakimon.sk.tsukuba.ac.jp> References: <877fy77zhp.fsf@web.de> <87lhmm24x9.fsf@gmail.com> <54812545.6030008@dancol.org> <87d27y22lp.fsf@gmail.com> <87lhmmiim7.fsf@gmail.com> <5481D080.7000206@dancol.org> <54822CD9.1000708@dancol.org> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1417858766 9982 80.91.229.3 (6 Dec 2014 09:39:26 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 6 Dec 2014 09:39:26 +0000 (UTC) Cc: emacs-devel@gnu.org, Stefan Monnier , Leo Liu To: Daniel Colascione Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sat Dec 06 10:39:18 2014 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XxBpd-0004k5-RM for ged-emacs-devel@m.gmane.org; Sat, 06 Dec 2014 10:39:18 +0100 Original-Received: from localhost ([::1]:53877 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XxBpd-0004yG-9n for ged-emacs-devel@m.gmane.org; Sat, 06 Dec 2014 04:39:17 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:59661) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XxBpU-0004y5-2U for emacs-devel@gnu.org; Sat, 06 Dec 2014 04:39:15 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XxBpM-0000Lb-JW for emacs-devel@gnu.org; Sat, 06 Dec 2014 04:39:08 -0500 Original-Received: from shako.sk.tsukuba.ac.jp ([130.158.97.161]:47719) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XxBpM-0000HM-A0 for emacs-devel@gnu.org; Sat, 06 Dec 2014 04:39:00 -0500 Original-Received: from uwakimon.sk.tsukuba.ac.jp (uwakimon.sk.tsukuba.ac.jp [130.158.99.156]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by shako.sk.tsukuba.ac.jp (Postfix) with ESMTPS id 2AF001C38C5; Sat, 6 Dec 2014 18:38:52 +0900 (JST) Original-Received: by uwakimon.sk.tsukuba.ac.jp (Postfix, from userid 1000) id 05D6B1A2CFC; Sat, 6 Dec 2014 18:38:51 +0900 (JST) In-Reply-To: <54822CD9.1000708@dancol.org> X-Mailer: VM undefined under 21.5 (beta34) "kale" acf1c26e3019 XEmacs Lucid (x86_64-unknown-linux) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 130.158.97.161 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 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-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:179124 Archived-At: Daniel Colascione writes: > On 12/05/2014 01:32 PM, Stefan Monnier wrote: > > The alternative I was thinking was to return a unique value, as in: > >=20 > > (defvar gen-eog (make-symbol "=C2=A1end-of-generator!")) > > (defun gen-eog-p (x) (eq x gen-oeg)) > >=20 >=20 > Right. That's the approach I don't like: now there's a value you > can't enumerate. What if you wanted to enumerate, say, the values > of all symbols? The existence of `make-symbol' already means you can't do that.