220 29240 <9EF2BB86-DC9D-4455-A850-EA173995A2E5@gmail.com> article Path: news.gmane.org!.POSTED!not-for-mail From: "Nevin \":-)\" Liber" <"Nevin ":-)" Liber" > Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: pragma once Date: Sat, 29 Oct 2016 14:35:56 -0500 Lines: 28 Approved: news@gmane.org Message-ID: <9EF2BB86-DC9D-4455-A850-EA173995A2E5@gmail.com> References: <2c278558-0dbc-4568-9b6b-7f159c94707e@isocpp.org> <4610802.tOzma7na2T@tjmaciei-mobl1> <3a2b221b-0234-715c-b9d8-1504314c5b87@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 (1.0) Content-Type: text/plain; charset=UTF-8 X-Trace: blaine.gmane.org 1477769771 30974 195.159.176.226 (29 Oct 2016 19:36:11 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sat, 29 Oct 2016 19:36:11 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCE35H5S6IDBBHXU2PAAKGQEYMOXXAY@isocpp.org Sat Oct 29 21:36:06 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-it0-f70.google.com ([209.85.214.70]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1c0ZQ6-0006Qo-HY for gclcip-std-proposals@m.gmane.org; Sat, 29 Oct 2016 21:35:58 +0200 Original-Received: by mail-it0-f70.google.com with SMTP id q75sf65507386itc.4 for ; Sat, 29 Oct 2016 12:36:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=from:mime-version:date:subject:message-id:references:in-reply-to:to :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:x-spam-checked-in-group:list-post :list-help:list-archive:list-subscribe:list-unsubscribe; bh=IAupTqykzGTs4TaGrts6n16lIMNdNZ2kUmmqVffrNqc=; b=oLIuSIlPgoFV6/ibGvZ3yeqsEgi+g2cRBt4nrXQ8OjIoZEpLVKHIzJMzHiuybQVJAY YnD9PyYziALB9vzejW3DYL8SEztqwf+6pLygysJzslT759O6TwPJYrqEzWPgs3XiuFMG oJTSgJpqnazrxKaCQMK1R0xqgFYHTRo7C68uScP6FS4QG0KXX94zRks5BJ3+EZMXs7Cy UPIE6/+x+4mRbeny1zjZei9+GxBSLm3rMKnHTsOqMHRdMIKVepTvbo+/1ik9Ikmo6Xwd uP2rFs8RluLVXFmxkodZwEIkzE9/3ubI3G0APFzJm5w9Yx72GVqAhNG9JKwjvgY5+rrB qApg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:mime-version:date:subject:message-id :references:in-reply-to:to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=IAupTqykzGTs4TaGrts6n16lIMNdNZ2kUmmqVffrNqc=; b=YyImOU00V/lCaOAlIEdnGfuQ8DZX3g0RclVvJPH6uqWnXI0CB1Jt5QghkH8WGeZFw1 /3t4vr64Y3+9OTehA/Geps6stgfI6l9s73JxTYLYmpmZYi1Pes3cT+RH4ZfSJkepI+ol PKpj8jt2S5kPudLgZV6IhBQWGiFMf40XzLov5snYvEhb0cC+Ylt4mK0qzAf0L2uRF6nW ktee+PAjB5Al443MbWFqdC6HCptZVu0tqFXmo+9zp5uHaKDmV8t6kaObpyKGdVQfC98j uqxu6nXtHylbGgOgD/YxngUu9L6/RkJmHwF8pkcgykMLEm2LayTbwycmtro0tDDEaVjJ 0IbA== X-Gm-Message-State: ABUngvcbtZdZtkbGQ1lUT+i8blX3j5cgCcsPDaitKhNOWmc3NuVUYbn87JprOv5036MBNg== X-Received: by 10.107.52.149 with SMTP id b143mr6583333ioa.1.1477769760890; Sat, 29 Oct 2016 12:36:00 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.134.168 with SMTP id q40ls2084239ioi.23.gmail; Sat, 29 Oct 2016 12:35:57 -0700 (PDT) X-Received: by 10.107.47.3 with SMTP id j3mr4609255ioo.32.1477769757971; Sat, 29 Oct 2016 12:35:57 -0700 (PDT) Original-Received: from mail-it0-f67.google.com (mail-it0-f67.google.com. [209.85.214.67]) by mx.google.com with ESMTPS id u127si6176553itd.112.2016.10.29.12.35.57 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 29 Oct 2016 12:35:57 -0700 (PDT) Received-SPF: pass (google.com: domain of nliber@gmail.com designates 209.85.214.67 as permitted sender) client-ip=209.85.214.67; Original-Received: by mail-it0-f67.google.com with SMTP id m138so2149983itm.3 for ; Sat, 29 Oct 2016 12:35:57 -0700 (PDT) X-Received: by 10.107.182.193 with SMTP id g184mr4636522iof.215.1477769757447; Sat, 29 Oct 2016 12:35:57 -0700 (PDT) Original-Received: from [10.12.179.251] (V-Gateway.d128.net. [50.205.11.242]) by smtp.gmail.com with ESMTPSA id x69sm5505643ite.10.2016.10.29.12.35.56 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 29 Oct 2016 12:35:56 -0700 (PDT) In-Reply-To: <3a2b221b-0234-715c-b9d8-1504314c5b87@gmail.com> X-Mailer: iPhone Mail (14B72c) X-Original-Sender: nliber@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of nliber@gmail.com designates 209.85.214.67 as permitted sender) smtp.mailfrom=nliber@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:29240 Archived-At: On Oct 29, 2016, at 1:50 PM, Andrey Semashev wrote: > >> On 10/29/16 21:08, Nevin Liber wrote: >> On Thu, Oct 27, 2016 at 6:06 PM, Andrey Semashev >> > wrote: >> >> On Fri, Oct 28, 2016 at 1:17 AM, Nevin Liber > > wrote: >> > >> > There are three possibilities: >> > >> > 1. It is the same file according to the OS (e.g.: inode and device >> match). >> > 2. It must have different contents according to the OS (e.g. the >> size doesn't >> > match). >> >> I think, the above two bullets cannot be implemented reliably. Event >> the size may not be available if the source is read from a pipe. What makes you believe that include guards work correctly with files that are pipes? -- 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/9EF2BB86-DC9D-4455-A850-EA173995A2E5%40gmail.com. .