220 14117 article Path: news.gmane.org!not-for-mail From: Peter Koch Larsen Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: #pragma once Date: Wed, 22 Oct 2014 12:39:15 +0200 Lines: 29 Approved: news@gmane.org Message-ID: References: <3d0ab5b0-73d9-434a-9ae4-cd47d8275590@isocpp.org> <202c5550-8669-4b45-aa39-9a8d26c37015@isocpp.org> <93885a74-f1c7-4c85-9309-7bd878f08670@isocpp.org> <11313423.lvzWu67DM3@tjmaciei-mobl4> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Trace: ger.gmane.org 1413974371 20142 80.91.229.3 (22 Oct 2014 10:39:31 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 22 Oct 2014 10:39:31 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDRIBXXKZQERBVEST2RAKGQEJDVL3PI@isocpp.org Wed Oct 22 12:39:20 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lb0-f199.google.com ([209.85.217.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XgtK2-0005yU-AI for gclcip-std-proposals@m.gmane.org; Wed, 22 Oct 2014 12:39:18 +0200 Original-Received: by mail-lb0-f199.google.com with SMTP id w7sf1831699lbi.10 for ; Wed, 22 Oct 2014 03:39:18 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe:content-type; bh=kP8joELbTBeLwA6QMuRunQy/vCaGYER9Yo6bzlMBnis=; b=iQxX0dPMJnlfg6aMc+DDgZMNxzgod9NkgXeqnfBreEZ4CCdm3g+ujdM570k/J75j2C mBSTCjsf8667sJY1MJJ6DghZhVYyUxAkwGcjU0usAht65aNFmnlhM0lYpacipTvPWNQe HedRM3gVzp42yf/jE/3UbGhHUerdK2gSIuiCgsC/U7tB9Jzs9YT8UqX2hr9P2bITS12z 4V6WFIt09ZoQxbEtAEs9blvM+BzmXvslXw8FanI4QuA4a+lW+PUstDBhcYv6T1CbghDw HP2KMpyED0/kWzko89zxXtO4epBdvnSnPoi3/fsNDrgCLMG1EjyW8QIkR6cQoPxI8P7G bugg== X-Gm-Message-State: ALoCoQmmYYKmeojLr2aLh232eDWJLUeiYWWkM+yq3zISaDaEpknrO8o2uEgbKMftKsAnBd1ne3hX X-Received: by 10.180.75.83 with SMTP id a19mr4712671wiw.2.1413974358024; Wed, 22 Oct 2014 03:39:18 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.152.10.2 with SMTP id e2ls158610lab.88.gmail; Wed, 22 Oct 2014 03:39:15 -0700 (PDT) X-Received: by 10.112.198.73 with SMTP id ja9mr40246385lbc.19.1413974355824; Wed, 22 Oct 2014 03:39:15 -0700 (PDT) Original-Received: from mail-la0-x229.google.com (mail-la0-x229.google.com. [2a00:1450:4010:c03::229]) by mx.google.com with ESMTPS id k1si22747989lam.96.2014.10.22.03.39.15 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 22 Oct 2014 03:39:15 -0700 (PDT) Received-SPF: pass (google.com: domain of peter.koch.larsen@gmail.com designates 2a00:1450:4010:c03::229 as permitted sender) client-ip=2a00:1450:4010:c03::229; Original-Received: by mail-la0-f41.google.com with SMTP id pn19so2676601lab.0 for ; Wed, 22 Oct 2014 03:39:15 -0700 (PDT) X-Received: by 10.112.125.106 with SMTP id mp10mr41513409lbb.50.1413974355358; Wed, 22 Oct 2014 03:39:15 -0700 (PDT) Original-Received: by 10.152.162.104 with HTTP; Wed, 22 Oct 2014 03:39:15 -0700 (PDT) In-Reply-To: <11313423.lvzWu67DM3@tjmaciei-mobl4> X-Original-Sender: peter.koch.larsen@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of peter.koch.larsen@gmail.com designates 2a00:1450:4010:c03::229 as permitted sender) smtp.mail=peter.koch.larsen@gmail.com; dkim=pass header.i=@gmail.com; dmarc=pass (p=NONE dis=NONE) header.from=gmail.com 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:14117 Archived-At: On 10/22/14, Thiago Macieira wrote: > On Tuesday 21 October 2014 19:01:36 Myriachan wrote: >> Sure, but that's years off if ever, and there are billions of lines of >> code >> in projects using #pragma once now. > So why do we need to change anything? If that code is already working, it's > working. If it's not working, then it won't magically begin working tomorrow > -- at best, it would become valid from next year on and projects wishing > compatibility would then begin using it in 2016 or 2017. > They may as well simply use include guards if they need compatibility. I agree with Thiago. Even if both my compilers support the once pragma I stick to include guards. They work if you provide a meaningful name (I include my initials and the date of construction so something like .... _PKL_2014_10_22). I believe it would save me sixty seconds to write #pragma instead. If include guards make your compilation slow, you should complain to your vendor. /Peter -- --- 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. 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