220 35656 article Path: news.gmane.org!.POSTED!not-for-mail From: Bo Persson Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: pragma once Date: Thu, 30 Nov 2017 15:51:30 +0100 Lines: 28 Approved: news@gmane.org Message-ID: References: <3d275c24-dc31-4fa7-a6db-e235ab2e00f1@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8"; format=flowed X-Trace: blaine.gmane.org 1512053514 22672 195.159.176.226 (30 Nov 2017 14:51:54 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 30 Nov 2017 14:51:54 +0000 (UTC) User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCZ6RLW3UIKBBAFWQDIQKGQEIVCTW4Y@isocpp.org Thu Nov 30 15:51:45 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lf0-f69.google.com ([209.85.215.69]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eKQBe-000533-O2 for gclcip-std-proposals@m.gmane.org; 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Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1eKQBX-0004cP-9a for std-proposals@isocpp.org; Thu, 30 Nov 2017 15:51:31 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 21 Original-X-Complaints-To: usenet@blaine.gmane.org In-Reply-To: <3d275c24-dc31-4fa7-a6db-e235ab2e00f1@isocpp.org> Content-Language: sv X-Original-Sender: gclcip-std-proposals@m.gmane.org X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 195.159.176.226 is neither permitted nor denied by best guess record for domain of gclcip-std-proposals@m.gmane.org) smtp.mailfrom=gclcip-std-proposals@m.gmane.org Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:35656 Archived-At: On 2017-11-30 15:33, kiruahxh@gmail.com wrote: > +1 : #pragma once should be standardized. > When working on projects with many classes, it's common to copy paste a > module (header/cpp) and to forget modifying the include guard. > Then you have strange errors because the same include guard is defined > by different files. > Pragra once doesn't have this problem. > Pragma once has other problems, like nobody has cared to specify what it means on systems other than Linux and Windows. And should the compiler writer be required to test the feature on every other file system that can possibly be mounted on your development system? The copy-paste error with the include guard has the advantage that you can fix it yourself. Bo Persson -- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an email to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/ovp5tc%24g28%241%40blaine.gmane.org. .