From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Keith David Bershatsky Newsgroups: gmane.emacs.devel Subject: Re: buffer.c/buffer.h: How to add new buffer-local variables? Date: Mon, 01 Apr 2019 00:43:42 -0700 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="198742"; mail-complaints-to="usenet@blaine.gmane.org" Cc: Alan Mackenzie , Eli Zaretskii , Andreas Schwab , emacs-devel@gnu.org To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Apr 01 09:44:18 2019 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1hArc9-000pb2-OP for ged-emacs-devel@m.gmane.org; Mon, 01 Apr 2019 09:44:18 +0200 Original-Received: from localhost ([127.0.0.1]:55947 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hArc8-0006eX-Oo for ged-emacs-devel@m.gmane.org; Mon, 01 Apr 2019 03:44:16 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:50367) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hArbp-0006Vh-54 for emacs-devel@gnu.org; Mon, 01 Apr 2019 03:43:58 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hArbo-0005Dp-3t for emacs-devel@gnu.org; Mon, 01 Apr 2019 03:43:57 -0400 Original-Received: from gateway24.websitewelcome.com ([192.185.51.172]:35193) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hArbn-00058B-OV for emacs-devel@gnu.org; Mon, 01 Apr 2019 03:43:56 -0400 Original-Received: from cm13.websitewelcome.com (cm13.websitewelcome.com [100.42.49.6]) by gateway24.websitewelcome.com (Postfix) with ESMTP id 148043133 for ; Mon, 1 Apr 2019 02:43:44 -0500 (CDT) Original-Received: from gator3053.hostgator.com ([50.87.144.69]) by cmsmtp with SMTP id ArbbhMZGzYTGMArbbhX4eu; Mon, 01 Apr 2019 02:43:44 -0500 X-Authority-Reason: nr=8 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lawlist.com ; s=default; h=Content-Type:MIME-Version:Subject:Cc:To:From:Message-ID:Date: Sender:Reply-To:Content-Transfer-Encoding:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: In-Reply-To:References:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=oRr+SJDpkCH6RF1UNlQI/l9TfaWNrsiOB0UC1zvNQkA=; b=B4jUTGEkMAS46pvrx2poVXyy0W X/N3qT7iNM/vU+PIpqjo0iPNB9sQ3j/MwS9INTPyZFFSc1fmwmDDP/RQwoVpLcPlUOoLForPUoo80 HI84VIhTYacPSF1boryC9SAA3bXsrGAl9SNAHYRmQHSUnF3GpnYU1BM5xNgsymID8kSDCrj7+3kB/ kzZTtkP7AsTdbpd1bpVluciw2nXbJnhpPu/funzEGtZJ3fnKfevBEaMhn6GdKGq0WJne+XgU4RgW+ fwQMAln98u0KpoJmLbD6f9DLZs+HAWEgvDPV+T6TcDP2ejWRqClM/uCQP3YYy0N3yRJMD+0Cj0VNn qnMCp/Xw==; Original-Received: from cpe-45-48-239-195.socal.res.rr.com ([45.48.239.195]:53043 helo=server.local) by gator3053.hostgator.com with esmtpsa (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.91) (envelope-from ) id 1hArbb-0006Wv-56; Mon, 01 Apr 2019 02:43:43 -0500 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator3053.hostgator.com X-AntiAbuse: Original Domain - gnu.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - lawlist.com X-BWhitelist: no X-Source-IP: 45.48.239.195 X-Source-L: No X-Exim-ID: 1hArbb-0006Wv-56 X-Source-Sender: cpe-45-48-239-195.socal.res.rr.com (server.local) [45.48.239.195]:53043 X-Source-Auth: lawlist X-Email-Count: 4 X-Source-Cap: bGF3bGlzdDtsYXdsaXN0O2dhdG9yMzA1My5ob3N0Z2F0b3IuY29t X-Local-Domain: yes X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 192.185.51.172 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:234847 Archived-At: Thank you, Stefan, for the insight regarding how to handle this particular issue. Greatly appreciated! Keith ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; > From: Stefan Monnier > Subject: Re: buffer.c/buffer.h: How to add new buffer-local variables? > Date: Sun, 31 Mar 2019 16:02:49 -0400 > >> if (!NILP (BVAR (XBUFFER (w->contents), crosshairs))) ... > > Buffer-local variables are appropriate in the `struct buffer` when it's > likely that most buffers will have their own setting for it. > > For variables that are likely to be used only in some particular > buffers, or only under some particular circumstances, it can make a lot > more sense to declare them as global variables and then rely on the > Elisp side using `make-local-variable` or `make-variable-buffer-local`, > so you don't pay for that slot in every buffer even tho it's almost > never used. > > Stefan