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: emacs-25 2460cfa: * doc/lispref/lists.texi (Association Lists): Document 'alist-get'. Date: Thu, 21 Jan 2016 18:44:25 +0100 Message-ID: <878u3in7ye.fsf@web.de> References: <20160116143238.27391.97533@vcs.savannah.gnu.org> <8737ttx5dm.fsf@web.de> <83oachbgz0.fsf@gnu.org> <87vb6pih39.fsf@web.de> <83h9i9besq.fsf@gnu.org> <87mvs1ieql.fsf@web.de> <83bn8hbcpp.fsf@gnu.org> <87a8o1ics6.fsf@web.de> <838u3lbbe8.fsf@gnu.org> <87vb6osb0o.fsf@web.de> <87h9i86tke.fsf@web.de> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1453398301 3010 80.91.229.3 (21 Jan 2016 17:45:01 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 21 Jan 2016 17:45:01 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Thu Jan 21 18:44:52 2016 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 1aMJHv-0006Oa-QG for ged-emacs-devel@m.gmane.org; Thu, 21 Jan 2016 18:44:51 +0100 Original-Received: from localhost ([::1]:49177 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aMJHv-0006HM-Am for ged-emacs-devel@m.gmane.org; Thu, 21 Jan 2016 12:44:51 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:59805) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aMJHj-0006HF-4M for emacs-devel@gnu.org; Thu, 21 Jan 2016 12:44:39 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aMJHf-0004nc-VZ for emacs-devel@gnu.org; Thu, 21 Jan 2016 12:44:39 -0500 Original-Received: from plane.gmane.org ([80.91.229.3]:53389) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aMJHf-0004n6-PG for emacs-devel@gnu.org; Thu, 21 Jan 2016 12:44:35 -0500 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1aMJHe-0006IG-8v for emacs-devel@gnu.org; Thu, 21 Jan 2016 18:44:34 +0100 Original-Received: from dslb-092-077-162-209.092.077.pools.vodafone-ip.de ([92.77.162.209]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 21 Jan 2016 18:44:34 +0100 Original-Received: from michael_heerdegen by dslb-092-077-162-209.092.077.pools.vodafone-ip.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 21 Jan 2016 18:44:34 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 27 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: dslb-092-077-162-209.092.077.pools.vodafone-ip.de User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) Cancel-Lock: sha1:ruTxtMBfSERRgKINDxNYL+fDOFw= 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:198510 Archived-At: Stefan Monnier writes: > >> > @Stefan: can you enlighten us why you didn't initially do this? > >> 'Cause I don't know how. > > I don't understand...what don't you know? > > How to provide a function that does the core work of (setf (alist-get > ..) ...), such that it can be used in the expanded code and ideally > even independently. I see. I think if we add an `alist-put', it should ideally be a macro (in analogy to `push' that adds to a plain list), and the signature should be analogous to `alist-get' OTOH. So we would end up with something like --8<---------------cut here---------------start------------->8--- (defmacro alist-put (key value place &optional default remove) (gv-letplace (_ setter) `(alist-get ,key ,place ,default ,remove) (funcall setter value))) --8<---------------cut here---------------end--------------->8--- Would it make sense to add something like this? Michael.