220 17910 <23FDBD1B-F790-4516-86BE-CF803B574239@mac.com> article Path: news.gmane.org!not-for-mail From: David Krauss Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: noexcept on a non per-function basis Date: Sat, 16 May 2015 23:46:15 +0800 Lines: 84 Approved: news@gmane.org Message-ID: <23FDBD1B-F790-4516-86BE-CF803B574239@mac.com> References: <2e801af3-ded3-4527-beb2-8767d393a077@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2098\)) Content-Type: multipart/alternative; boundary="Apple-Mail=_664725D6-B86A-4E4F-A36C-86116E66F111" X-Trace: ger.gmane.org 1431791206 1448 80.91.229.3 (16 May 2015 15:46:46 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 16 May 2015 15:46:46 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBAABBWWM3WVAKGQEZSTLAKI@isocpp.org Sat May 16 17:46:37 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pd0-f200.google.com ([209.85.192.200]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1YteIO-0001FS-LE for gclcip-std-proposals@m.gmane.org; Sat, 16 May 2015 17:46:36 +0200 Original-Received: by pdbqb6 with SMTP id qb6sf274452901pdb.3 for ; Sat, 16 May 2015 08:46:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:content-type:message-id:mime-version :subject:date:references:to:in-reply-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; bh=4V3S3t/uLZfY92v+kzNT+vacyGg3YjTcWD1TxS5UV5k=; b=egYH9Ddxta+297GtRGEqfhkQE6lbn4P8ic7hZSfDnaT4Ldhpjz5jR+M0PW2Ia79ymX ISYMFjko5RZEJuXduCPmrhvz/HDlhbQ9A995KuEPvUWJrZZNz2E8TgkYfWv4XVNepaDy RzwX8Td8RRDaQWwOirdhM4idUIY51ShnpcVvia15kbwpIZDx7pGyrQCcKNAMd3RiXVc8 p2XznOX9GKyO5KiIRhoM/fXgRKS/tuApZFhON14nCzP0efssqOMGzc3IbfT4H6ogSSYO bjB5lKkkVoZrybyLyleMghyctR6FKHAzYSN7oXbdODjohx71LFzLaAwoFQTdspNlUAsl v08A== X-Gm-Message-State: ALoCoQnOVZbeTdorP6NDNB36XI9a2zQFYBkksus45PZoH7IOuhPKwBQQaIKi0WpZCgSnhaRbMMjd X-Received: by 10.68.173.3 with SMTP id bg3mr20434521pbc.14.1431791195551; Sat, 16 May 2015 08:46:35 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.14.70 with SMTP id 67ls1486233ioo.38.gmail; Sat, 16 May 2015 08:46:34 -0700 (PDT) X-Received: by 10.69.31.106 with SMTP id kl10mr28322710pbd.155.1431791194542; Sat, 16 May 2015 08:46:34 -0700 (PDT) Original-Received: from nk11p04mm-asmtp002.mac.com (nk11p04mm-asmtpout002.mac.com. [17.158.236.237]) by mx.google.com with ESMTPS id ac1si7751860pad.97.2015.05.16.08.46.34 for (version=TLSv1.2 cipher=AES128-GCM-SHA256 bits=128/128); Sat, 16 May 2015 08:46:34 -0700 (PDT) Received-SPF: pass (google.com: domain of potswa@mac.com designates 17.158.236.237 as permitted sender) client-ip=17.158.236.237; Original-Received: from [172.20.10.2] (unknown [121.54.44.91]) by nk11p04mm-asmtp002.mac.com (Oracle Communications Messaging Server 7.0.5.35.0 64bit (built Dec 4 2014)) with ESMTPSA id <0NOG00JQ5953H640@nk11p04mm-asmtp002.mac.com> for std-proposals@isocpp.org; Sat, 16 May 2015 15:46:18 +0000 (GMT) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.14.151,1.0.33,0.0.0000 definitions=2015-05-16_01:2015-05-15,2015-05-16,1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=1 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=7.0.1-1412110000 definitions=main-1505160222 In-reply-to: <2e801af3-ded3-4527-beb2-8767d393a077@isocpp.org> X-Mailer: Apple Mail (2.2098) X-Original-Sender: potswa@mac.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of potswa@mac.com designates 17.158.236.237 as permitted sender) smtp.mail=potswa@mac.com; dmarc=pass (p=NONE dis=NONE) header.from=mac.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:17910 Archived-At: --Apple-Mail=_664725D6-B86A-4E4F-A36C-86116E66F111 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 > On 2015=E2=80=9305=E2=80=9316, at 11:25 PM, Viktor Kirilov wrote: >=20 > All functions by default are noexcept(false) (except for destructors sinc= e c++11?). Implicitly-defined functions get computed noexcept specifications. > Is there a reason noexcept cannot be applied to a class like __declspec(d= llexport) or to a scope - like extern "C"? extern "C++ noexcept" can fill this role. Those strings can be anything, an= d modify the interpretation of the enclosed scope in any way. They=E2=80=99= re mainly intended to modify the ABI in effect. It=E2=80=99s not too much o= f a stretch to say that forbidding any function to propagate an exception i= s just an alternate ABI. Only problem is, it can only appear at namespace scope. However, it might b= e more reasonable and better justified to mark an entire interface as noexc= ept (or even constexpr) as opposed to just part of a class. --=20 ---=20 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 e= mail 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-proposa= ls/. --Apple-Mail=_664725D6-B86A-4E4F-A36C-86116E66F111 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=UTF-8
On 2015=E2=80=9305= =E2=80=9316, at 11:25 PM, Viktor Kirilov <vik.kirilov@gmail.com> wrote:

=
All functions by default are noexcept(false) (except for de= structors since c++11?).

=
Implicitly-defined functions get computed noexcept specifications.

Is th= ere a reason noexcept cannot be applied to a class like __declspec(dllexpor= t) or to a scope - like extern "C"?

extern "C++ noexcep= t" can fill this role. Those strings can be anything, and modif= y the interpretation of the enclosed scope in any way. They=E2=80=99re main= ly intended to modify the ABI in effect. It=E2=80=99s not too much of a str= etch to say that forbidding any function to propagate an exception is just = an alternate ABI.

Only problem is, it c= an only appear at namespace scope. However, it might be more reasonable and= better justified to mark an entire interface as noexcept (or even constexp= r) as opposed to just part of a class.

--

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Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposals/<= /a>.
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