220 14101 <202c5550-8669-4b45-aa39-9a8d26c37015@isocpp.org> article Path: news.gmane.org!not-for-mail From: Chet Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: #pragma once Date: Tue, 21 Oct 2014 13:32:00 -0700 (PDT) Lines: 81 Approved: news@gmane.org Message-ID: <202c5550-8669-4b45-aa39-9a8d26c37015@isocpp.org> References: <3d0ab5b0-73d9-434a-9ae4-cd47d8275590@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_4950_322201839.1413923520392" X-Trace: ger.gmane.org 1413923528 29953 80.91.229.3 (21 Oct 2014 20:32:08 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 21 Oct 2014 20:32:08 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCSONVVQUEDRBQEFTORAKGQEZ5IJE4I@isocpp.org Tue Oct 21 22:32:04 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pd0-f199.google.com ([209.85.192.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Xgg66-0006qz-Hu for gclcip-std-proposals@m.gmane.org; Tue, 21 Oct 2014 22:32:02 +0200 Original-Received: by mail-pd0-f199.google.com with SMTP id g10sf9776095pdj.6 for ; Tue, 21 Oct 2014 13:32:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe :content-type; bh=ps8bP8JvpETOFs54sxkT+AmhZdgLa4AcBu7gr4lJ798=; b=DQoBZgaevq8gNFvxdElAapTrMSPw2lWHLQ0PvrWeSKdJQmYltOv9q1QrSwrGENM4Lh vIzSJQDE3PcyGf6td8P1ho9UZLpU4j2kLDfiujtMsAwvRAmE2OLWx6m5iE29aS3fL3m8 PfYsHERE1tud7k73ySC9Vd4eQjlwKbLa69LZLLqfhxXEAPVhyTEaY/elK0SXyBTkgHuu HPGRr5pp/nPnoZtYRuxIVhoWDob0fKUrjbzreaeHZbsImJOswW1ZsyMVdyHnsbScchjv YaPLnEvEoJcUaeohtdhm3fuB+G/ndz92YQ/JvFRyYbzqPwOtITUWI6+A3Z7YpIS6/bbB X/Kg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:message-id:in-reply-to:references :subject:mime-version:x-original-sender:reply-to:precedence :mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=ps8bP8JvpETOFs54sxkT+AmhZdgLa4AcBu7gr4lJ798=; b=O1TxnZr+QoKqQiEZ28j3U3TawV9+a6lR2wIPuAf1n8fksJD29mN7pjVkd0CpF8s1uk xGbbmU9n3RVaqBa8cgY7AKWI9gV6WeKeLtmpiznu+cPoCNHRI3OFcDDTfOc3RO+6U//k QcEKbBqaQOZyzijLR4LbYfQ+ZQ2Kkz4qF7HLHDPUn9aLPektDmtVFSZz12tx32/gqJwY CDq9lS1SkBpJVgwNDpOHh25LKUVPn0Iu0PVxTwWdyLcEmMx5GLG5n89zhTCAweIycV5E bLx96qEnJ6xuV3sfmjIxeYb2wxLmVKlTXb1hsLUUiTe3D/dbUT4u2UfEqzPBP5fdRi20 57Yg== X-Gm-Message-State: ALoCoQndqpGuu6BR5Z2Tw2YQy8kdmV5MeiTch1rBIDg51BlJRhySjd6b9uXJ/3MDNExHuD/pEqr2 X-Received: by 10.66.66.196 with SMTP id h4mr783590pat.26.1413923521474; Tue, 21 Oct 2014 13:32:01 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.96.197 with SMTP id k63ls397872qge.69.gmail; Tue, 21 Oct 2014 13:32:00 -0700 (PDT) X-Received: by 10.140.21.49 with SMTP id 46mr35659qgk.30.1413923520683; Tue, 21 Oct 2014 13:32:00 -0700 (PDT) In-Reply-To: X-Original-Sender: chet.skolos@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:14101 Archived-At: ------=_Part_4950_322201839.1413923520392 Content-Type: text/plain; charset=UTF-8 It has been determined that it is more difficult to implement than you would think: http://stackoverflow.com/questions/23696115/is-pragma-once-part-of-the-c11-standard http://stackoverflow.com/questions/1695807/why-isnt-c-cs-pragma-once-an-iso-standard The Modules proposal aims to solve the problems of include files in a better way: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4047.pdf --Chet On Tuesday, 21 October 2014 13:15:51 UTC-7, Vittorio Romeo wrote: > > +1. It's superior to header guards in terms of maintainability, > readability and (sometimes) performance. Why isn't it standard? > > Vittorio Romeo > http://vittorioromeo.info > > -- --- 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. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposals/. ------=_Part_4950_322201839.1413923520392 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
It has been determined that it is more difficult to i= mplement than you would think:
http://stackoverflow.com/questions/2369= 6115/is-pragma-once-part-of-the-c11-standard
http://stackoverflow.com/q= uestions/1695807/why-isnt-c-cs-pragma-once-an-iso-standard

The Modules proposal aims to solve the problems of= include files in a better way:
http://www.open-std.org/jtc1/sc22/wg21/docs/pap= ers/2014/n4047.pdf

--Chet
<= div>
On Tuesday, 21 October 2014 13:15:51 UTC-7, Vittorio Rom= eo wrote:
+1. It's superior to header guards in terms of mainta= inability, readability and (sometimes) performance. Why isn't it standard?<= br>
Vittorio Romeo

--

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