From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Sebastian Tennant Newsgroups: gmane.lisp.guile.user Subject: Re: Dynamic variable binding Date: Fri, 19 Dec 2008 15:46:43 +0000 Message-ID: References: <8wro202o.fsf@vps203.linuxvps.org> <200811130051.mAD0pReg006490@fcs13.keithdiane.us> <877i5w71vu.fsf@gnu.org> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: ger.gmane.org 1229701614 9636 80.91.229.12 (19 Dec 2008 15:46:54 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 19 Dec 2008 15:46:54 +0000 (UTC) To: guile-user@gnu.org Original-X-From: guile-user-bounces+guile-user=m.gmane.org@gnu.org Fri Dec 19 16:48:00 2008 Return-path: Envelope-to: guile-user@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1LDhZr-0000SA-8Y for guile-user@m.gmane.org; Fri, 19 Dec 2008 16:47:47 +0100 Original-Received: from localhost ([127.0.0.1]:38138 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1LDhYe-0006Oo-T2 for guile-user@m.gmane.org; Fri, 19 Dec 2008 10:46:32 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1LDhYb-0006Mz-47 for guile-user@gnu.org; Fri, 19 Dec 2008 10:46:29 -0500 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1LDhYZ-0006LC-Jd for guile-user@gnu.org; Fri, 19 Dec 2008 10:46:28 -0500 Original-Received: from [199.232.76.173] (port=54824 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1LDhYZ-0006Kx-EC for guile-user@gnu.org; Fri, 19 Dec 2008 10:46:27 -0500 Original-Received: from main.gmane.org ([80.91.229.2]:42311 helo=ciao.gmane.org) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1LDhYY-0005g7-V0 for guile-user@gnu.org; Fri, 19 Dec 2008 10:46:27 -0500 Original-Received: from list by ciao.gmane.org with local (Exim 4.43) id 1LDhYX-0004Mz-Dd for guile-user@gnu.org; Fri, 19 Dec 2008 15:46:25 +0000 Original-Received: from vps203.linuxvps.org ([91.186.7.203]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 19 Dec 2008 15:46:25 +0000 Original-Received: from sebyte by vps203.linuxvps.org with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 19 Dec 2008 15:46:25 +0000 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 29 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: vps203.linuxvps.org User-Agent: Gnus/5.110011 (No Gnus v0.11) Emacs/22.2 (gnu/linux) Cancel-Lock: sha1:JZUADweqFpHY5XiavNxDDxMOjNk= X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-BeenThere: guile-user@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General Guile related discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: guile-user-bounces+guile-user=m.gmane.org@gnu.org Errors-To: guile-user-bounces+guile-user=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.user:7025 Archived-At: Quoth ludo@gnu.org (Ludovic Courtès): > Hi, > > Sebastian Tennant writes: > >> My semantic point is that the first argument to definer (above) is not a >> symbol and it's not a variable (an unbound variable error would be >> thrown if it was), so in the context of the first agument to define >> there is a third data type; 'variable name'. > > Beware: the term "variable" can refer to an object as returned by > `make-variable', `module-variable', etc., in Guile parlance (info > "(guile) Variables"). Noted. > What happens with your `definer' macro is that the first argument of the > macro is a symbol (that is, during the *macro expansion* phase). The > result of `definer' (an sexp) is then itself evaluated, so that symbol > becomes a reference to a variable (during the evaluation phase). Thanks for your input Ludo. I can't say I've fully grokked it yet but I'm spending _far_ too much time on this, so I'm going to let it go for now :) Seb