From mboxrd@z Thu Jan 1 00:00:00 1970 Path: main.gmane.org!not-for-mail From: Barry Margolin Newsgroups: gmane.emacs.help Subject: Re: Object identity Date: Tue, 21 Oct 2003 21:39:51 GMT Organization: Level(3) Communications, Woburn, MA Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Message-ID: References: NNTP-Posting-Host: deer.gmane.org X-Trace: sea.gmane.org 1066772805 6401 80.91.224.253 (21 Oct 2003 21:46:45 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Tue, 21 Oct 2003 21:46:45 +0000 (UTC) Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Tue Oct 21 23:46:42 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 1AC4Kw-0005Og-00 for ; Tue, 21 Oct 2003 23:46:42 +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 1AC4KY-0004K4-Dv for geh-help-gnu-emacs@m.gmane.org; Tue, 21 Oct 2003 17:46:18 -0400 Original-Path: shelby.stanford.edu!newsfeed.stanford.edu!bloom-beacon.mit.edu!nycmny1-snh1.gtei.net!crtntx1-snh1.gtei.net!news.gtei.net!news.level3.com.POSTED!53ab2750!not-for-mail Original-Newsgroups: gnu.emacs.help Mail-Copies-To: never X-Newsreader: trn 4.0-test72 (19 April 1999) Originator: barmar@genuity.net (Barry Margolin) Original-Lines: 23 Original-NNTP-Posting-Host: 171.78.176.30 Original-X-Trace: news.level3.com 1066772391 171.78.176.30 (Tue, 21 Oct 2003 21:39:51 GMT) Original-NNTP-Posting-Date: Tue, 21 Oct 2003 21:39:51 GMT Original-Xref: shelby.stanford.edu gnu.emacs.help:117515 Original-To: help-gnu-emacs@gnu.org 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:13446 X-Report-Spam: http://spam.gmane.org/gmane.emacs.help:13446 In article , Stefan Monnier wrote: >>> > 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. > >Might be confusing, but after all, it's a behavior that can appear >even with a "real" implementation of print-unreadable-object. The point of the hash table is to remember the ID between calls to print-unreadable-object, so that the same object will usually be printed the same way. If you flush it at the end of each call, it will never contain anything! -- Barry Margolin, barry.margolin@level3.com Level(3), Woburn, MA *** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups. Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.