From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.devel Subject: Re: Generators (iterators) for Gnu Emacs Date: Fri, 05 Dec 2014 20:06:36 +0100 Message-ID: <87tx19q5kz.fsf@web.de> References: <877fy77zhp.fsf@web.de> <874mtato99.fsf@fencepost.gnu.org> <87iohqrpex.fsf@web.de> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1417806447 27928 80.91.229.3 (5 Dec 2014 19:07:27 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 5 Dec 2014 19:07:27 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri Dec 05 20:07:20 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 1XwyDn-0004h9-Qu for ged-emacs-devel@m.gmane.org; Fri, 05 Dec 2014 20:07:19 +0100 Original-Received: from localhost ([::1]:52129 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XwyDn-0001u1-A1 for ged-emacs-devel@m.gmane.org; Fri, 05 Dec 2014 14:07:19 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:40271) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XwyDT-0001sa-7w for emacs-devel@gnu.org; Fri, 05 Dec 2014 14:07:05 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XwyDN-0006po-8T for emacs-devel@gnu.org; Fri, 05 Dec 2014 14:06:59 -0500 Original-Received: from plane.gmane.org ([80.91.229.3]:57422) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XwyDN-0006pe-1f for emacs-devel@gnu.org; Fri, 05 Dec 2014 14:06:53 -0500 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1XwyDJ-0004Qp-Qu for emacs-devel@gnu.org; Fri, 05 Dec 2014 20:06:49 +0100 Original-Received: from ip-90-186-215-205.web.vodafone.de ([90.186.215.205]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 05 Dec 2014 20:06:49 +0100 Original-Received: from michael_heerdegen by ip-90-186-215-205.web.vodafone.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 05 Dec 2014 20:06:49 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 26 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: ip-90-186-215-205.web.vodafone.de User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) Cancel-Lock: sha1:wQqRId6r1OXXNoY78ydbBHqEpVg= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 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:178989 Archived-At: Stefan Monnier writes: > > Yes, that had been the intention. To make it work with dynamic callers, > > I would have to defvar the uninterned symbol. > > Not only that, you'd have to build the lambda at run-time (i.e. make > the closures "by hand"). Would this version fix the issue? --8<---------------cut here---------------start------------->8--- (defmacro gen-make (&rest body) `(gen-make-1 (lambda () ,@body))) (defun gen-make-1 (fun) (let (this-element) (lambda () (if (eq this-element 'gen-done) 'gen-done (setq this-element (funcall fun)))))) --8<---------------cut here---------------end--------------->8--- Though, this `gen-make' is still inferior without lexical binding, but at least should avoid the error. Michael.