From mboxrd@z Thu Jan 1 00:00:00 1970 Path: main.gmane.org!not-for-mail From: Lars Brinkhoff Newsgroups: gmane.emacs.help Subject: Re: Object identity Date: 21 Oct 2003 22:13:20 +0200 Organization: nocrew Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Message-ID: <85wuay8i3j.fsf@junk.nocrew.org> References: NNTP-Posting-Host: deer.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: sea.gmane.org 1066767384 23338 80.91.224.253 (21 Oct 2003 20:16:24 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Tue, 21 Oct 2003 20:16:24 +0000 (UTC) Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Tue Oct 21 22:16:19 2003 Return-path: Original-Received: from monty-python.gnu.org ([199.232.76.173]) by deer.gmane.org with esmtp (Exim 3.35 #1 (Debian)) id 1AC2vS-0007bw-01 for ; Tue, 21 Oct 2003 22:16:18 +0200 Original-Received: from localhost ([127.0.0.1] helo=monty-python.gnu.org) by monty-python.gnu.org with esmtp (Exim 4.24) id 1AC2tS-0000qX-Gx for geh-help-gnu-emacs@m.gmane.org; Tue, 21 Oct 2003 16:14:14 -0400 Original-Received: from list by monty-python.gnu.org with tmda-scanned (Exim 4.24) id 1AC2t9-0000q6-82 for help-gnu-emacs@gnu.org; Tue, 21 Oct 2003 16:13:55 -0400 Original-Received: from mail by monty-python.gnu.org with spam-scanned (Exim 4.24) id 1AC2sd-0000Ma-3g for help-gnu-emacs@gnu.org; Tue, 21 Oct 2003 16:13:54 -0400 Original-Received: from [80.91.224.249] (helo=main.gmane.org) by monty-python.gnu.org with esmtp (Exim 4.24) id 1AC2sc-0000LV-Ae for help-gnu-emacs@gnu.org; Tue, 21 Oct 2003 16:13:22 -0400 Original-Received: from list by main.gmane.org with local (Exim 3.35 #1 (Debian)) id 1AC2sb-0004sL-00 for ; Tue, 21 Oct 2003 22:13:21 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-To: help-gnu-emacs@gnu.org Original-Received: from sea.gmane.org ([80.91.224.252]) by main.gmane.org with esmtp (Exim 3.35 #1 (Debian)) id 1AC2sa-0004sD-00 for ; Tue, 21 Oct 2003 22:13:20 +0200 Original-Received: from news by sea.gmane.org with local (Exim 3.35 #1 (Debian)) id 1AC2sa-0005xu-00 for ; Tue, 21 Oct 2003 22:13:20 +0200 Original-Lines: 18 Original-X-Complaints-To: usenet@sea.gmane.org User-Agent: Gnus/5.0808 (Gnus v5.8.8) Emacs/20.7 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.2 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: main.gmane.org gmane.emacs.help:13439 X-Report-Spam: http://spam.gmane.org/gmane.emacs.help:13439 Stefan Monnier writes: > > Well, either I need weak hash tables, or a different implementation > > of object-identity. > Given your particular situation, you can just flush your hash-table at the > end of print-unreadable-object, so it does not even need to be weak. Yes, but that would print eq objects differently between two subsequent calls to print-unreadable-object, which probably would confuse the user. I might almost as well print "0" for all object identities. Flushing somewhat less often (for some value of "less") would be good enough, I think. It's not like all objects are in the hash table, so the memory overhead isn't large. -- Lars Brinkhoff, Services for Unix, Linux, GCC, HTTP Brinkhoff Consulting http://www.brinkhoff.se/