From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: Faking local dynamic function bindings Date: Wed, 29 Jan 2014 08:16:55 -0500 Message-ID: References: NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1391001472 18296 80.91.229.3 (29 Jan 2014 13:17:52 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 29 Jan 2014 13:17:52 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Wed Jan 29 14:17:59 2014 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1W8V1c-0007kY-0G for geh-help-gnu-emacs@m.gmane.org; Wed, 29 Jan 2014 14:17:52 +0100 Original-Received: from localhost ([::1]:42180 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1W8V1b-0006Bg-I5 for geh-help-gnu-emacs@m.gmane.org; Wed, 29 Jan 2014 08:17:51 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:43150) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1W8V12-0005i0-2e for help-gnu-emacs@gnu.org; Wed, 29 Jan 2014 08:17:23 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1W8V0u-0001Pv-OT for help-gnu-emacs@gnu.org; Wed, 29 Jan 2014 08:17:15 -0500 Original-Received: from plane.gmane.org ([80.91.229.3]:34091) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1W8V0u-0001Pr-I5 for help-gnu-emacs@gnu.org; Wed, 29 Jan 2014 08:17:08 -0500 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1W8V0s-0007Nn-Dx for help-gnu-emacs@gnu.org; Wed, 29 Jan 2014 14:17:06 +0100 Original-Received: from 69-165-152-57.dsl.teksavvy.com ([69.165.152.57]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 29 Jan 2014 14:17:06 +0100 Original-Received: from monnier by 69-165-152-57.dsl.teksavvy.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 29 Jan 2014 14:17:06 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 23 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 69-165-152-57.dsl.teksavvy.com User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux) Cancel-Lock: sha1:r1+t/OYV5t/FqihouJceXMeoKZM= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 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 Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:95750 Archived-At: > This resembles an earlier version of my code, but AFAIU it has the > disadvantage that the local macro binding is created and destroyed every > time the anonymous function is executed, which I guess creates extra > overhead and makes the function slower. If that turns out to be a problem, you can do it as follows: (defun foo (sexpr) (let ((macroenv `((contains . ,(lambda (regexp) `(string-match ,regexp ,string)))))) (sort (delq nil (mapcar (lambda (item) (let ((string (assq item strings-alist))) (when (eval (macroexpand-all sexpr macroenv)) string)) items-alist))) #'string<))) -- Stefan