From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: pjb@informatimago.com (Pascal J. Bourguignon) Newsgroups: gmane.emacs.help Subject: Re: Hash-table elements Date: Tue, 29 Sep 2009 15:17:08 +0200 Organization: Anevia SAS Message-ID: <7c7hvhki0b.fsf@pbourguignon.lefevre.anevia.com> References: <0c37c5b5-6683-4705-a2e4-e0c5ccb34614@e12g2000yqi.googlegroups.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: ger.gmane.org 1254231650 4221 80.91.229.12 (29 Sep 2009 13:40:50 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 29 Sep 2009 13:40:50 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Tue Sep 29 15:40:43 2009 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1Mscwa-0000e8-Dh for geh-help-gnu-emacs@m.gmane.org; Tue, 29 Sep 2009 15:40:40 +0200 Original-Received: from localhost ([127.0.0.1]:41543 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1MscwZ-0002Ic-TH for geh-help-gnu-emacs@m.gmane.org; Tue, 29 Sep 2009 09:40:39 -0400 Original-Path: news.stanford.edu!usenet.stanford.edu!news.tele.dk!news.tele.dk!small.news.tele.dk!proxad.net!feeder1-2.proxad.net!cleanfeed3-b.proxad.net!nnrp20-1.free.fr!not-for-mail Original-Newsgroups: gnu.emacs.help Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwAQMAAABtzGvEAAAABlBMVEUAAAD///+l2Z/dAAAA oElEQVR4nK3OsRHCMAwF0O8YQufUNIQRGIAja9CxSA55AxZgFO4coMgYrEDDQZWPIlNAjwq9 033pbOBPtbXuB6PKNBn5gZkhGa86Z4x2wE67O+06WxGD/HCOGR0deY3f9Ijwwt7rNGNf6Oac l/GuZTF1wFGKiYYHKSFAkjIo1b6sCYS1sVmFhhhahKQssRjRT90ITWUk6vvK3RsPGs+M1RuR mV+hO/VvFAAAAABJRU5ErkJggg== X-Accept-Language: fr, es, en X-Disabled: X-No-Archive: no User-Agent: Gnus/5.101 (Gnus v5.10.10) Emacs/22.2 (gnu/linux) Cancel-Lock: sha1:sLnWL4xe/XyvB7j68KdkMMUCjMU= Original-Lines: 31 Original-NNTP-Posting-Date: 29 Sep 2009 15:17:08 MEST Original-NNTP-Posting-Host: 88.170.236.224 Original-X-Trace: 1254230228 news-1.free.fr 25248 88.170.236.224:38459 Original-X-Complaints-To: abuse@proxad.net Original-Xref: news.stanford.edu gnu.emacs.help:173417 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:68531 Archived-At: Nordl=F6w writes: > Can hash-tables contain references other "global" structures? > > I have a hash-table that maps filenames to their metadata,file-scan- > hits/misses. > I don't want to pull-change-push the whole meta-data value whenever I > change parts of these metadata/hits. > > Is this possible somehow? Yes. Only do not modify the keys! You wouldn't be able to retrieve them, since changing the state of a key would probably change its hash value, and therefore the bucket where the hash-table stored it. But you can do whatever you want on the value. (require 'cl) (let ((h (make-hash-table))) (let ((value (list 1 2 3)) (key :my-list)) (setf (gethash key h) value) (setf (car value) 0 (cdr value) 'z) (gethash key h))) --> (0 . z) =20=20=20=20=20 --=20 __Pascal Bourguignon__