From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Neil Jerram Newsgroups: gmane.lisp.guile.devel Subject: Re: truth of %nil Date: Tue, 01 Sep 2009 22:50:14 +0100 Message-ID: <87vdk2nxm1.fsf@arudy.ossau.uklinux.net> References: <87k52uvhnt.fsf@arudy.ossau.uklinux.net> <20090702142823.GA1401@fibril.netris.org> <877hyqk8bx.fsf@arudy.ossau.uklinux.net> <20090703153218.GA1382@fibril.netris.org> <20090705024135.GA2363@fibril.netris.org> <20090707111406.GA1388@fibril.netris.org> <87iqg5y2o8.fsf@arudy.ossau.uklinux.net> <20090830141519.GB2255@fibril.netris.org> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1251841937 9744 80.91.229.12 (1 Sep 2009 21:52:17 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 1 Sep 2009 21:52:17 +0000 (UTC) Cc: Andy Wingo , guile-devel To: Mark H Weaver Original-X-From: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Tue Sep 01 23:52:10 2009 Return-path: Envelope-to: guile-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1MibGr-0005aF-DW for guile-devel@m.gmane.org; Tue, 01 Sep 2009 23:52:09 +0200 Original-Received: from localhost ([127.0.0.1]:40283 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1MibGq-0008Mt-7V for guile-devel@m.gmane.org; Tue, 01 Sep 2009 17:52:08 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1MibF9-0007bQ-C3 for guile-devel@gnu.org; Tue, 01 Sep 2009 17:50:23 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1MibF4-0007Z9-M8 for guile-devel@gnu.org; Tue, 01 Sep 2009 17:50:22 -0400 Original-Received: from [199.232.76.173] (port=44458 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1MibF4-0007Z6-4P for guile-devel@gnu.org; Tue, 01 Sep 2009 17:50:18 -0400 Original-Received: from mail3.uklinux.net ([80.84.72.33]:35666) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1MibF3-0007gu-6L for guile-devel@gnu.org; Tue, 01 Sep 2009 17:50:17 -0400 Original-Received: from arudy (host86-152-99-133.range86-152.btcentralplus.com [86.152.99.133]) by mail3.uklinux.net (Postfix) with ESMTP id 0C1A81F676C; Tue, 1 Sep 2009 22:50:16 +0100 (BST) Original-Received: from arudy.ossau.uklinux.net (arudy [127.0.0.1]) by arudy (Postfix) with ESMTP id 0D9D738021; Tue, 1 Sep 2009 22:50:15 +0100 (BST) In-Reply-To: <20090830141519.GB2255@fibril.netris.org> (Mark H. Weaver's message of "Sun\, 30 Aug 2009 10\:15\:19 -0400") User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.2 (gnu/linux) X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.4-2.6 X-BeenThere: guile-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Developers list for Guile, the GNU extensibility library" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Errors-To: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.devel:9240 Archived-At: Mark H Weaver writes: > On Sun, Aug 30, 2009 at 12:13:59PM +0100, Neil Jerram wrote: >> Mark H Weaver writes: >> >> > This numbering has the nice properties that 0 is #f. >> >> Just to be clear: will this mean that (SCM_BOOL_F == 0) ? As things >> stand I don't think it will, because SCM_MAKIFLAG shifts and adds >> 0x04. > > Yes, that's correct. SCM_BOOL_F is 4. What I should have said above > is that #f is IFLAG number 0. Thanks for clarifying that. (And from other threads it seems clear now that SCM_BOOL_F == 0 would actually be a problem!) Neil