220 34630 <59D5DB4C.90403@gmx.net> article Path: news.gmane.org!.POSTED!not-for-mail From: Jens Maurer Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: D0779R0: Proposing operator try() draft 1 paper Date: Thu, 05 Oct 2017 09:12:12 +0200 Lines: 38 Approved: news@gmane.org Message-ID: <59D5DB4C.90403@gmx.net> References: <13df2242-f7dd-405d-b8b9-23b47981c56e@isocpp.org> <59D4D462.9040106@gmx.net> <602e9e20-1d2f-4545-be32-d0234639985c@isocpp.org> <229b9108-ece9-28a1-dbf5-c845e338f557@wanadoo.fr> <32606f9f-1525-43c5-b6f3-50e789b7d234@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" Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1507187537 29674 195.159.176.226 (5 Oct 2017 07:12:17 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 5 Oct 2017 07:12:17 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux i686; rv:6.0.1) Gecko/20110830 Thunderbird/6.0.1 To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDPMTYGK64JRBUFW27HAKGQEOBC5UXA@isocpp.org Thu Oct 05 09:12:13 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wr0-f200.google.com ([209.85.128.200]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e00KH-00070N-DU for gclcip-std-proposals@m.gmane.org; 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[212.227.15.19]) by mx.google.com with ESMTPS id o40si3830933wrf.300.2017.10.05.00.12.16 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 05 Oct 2017 00:12:16 -0700 (PDT) Received-SPF: pass (google.com: domain of jens.maurer@gmx.net designates 212.227.15.19 as permitted sender) client-ip=212.227.15.19; Original-Received: from [192.168.2.100] ([178.7.78.77]) by mail.gmx.com (mrgmx003 [212.227.17.190]) with ESMTPSA (Nemesis) id 0LbMF8-1dcF6K2mKY-00kvSO for ; Thu, 05 Oct 2017 09:12:15 +0200 In-Reply-To: X-Provags-ID: V03:K0:Au50P6ibPeLCANQDDEqcw8OtAXw9hi3zRTBgZV3lzvW1AJwMIQY mqNCRzk+RB8CgFfgWOx8+rAfpvR+DaXnjSGF3iehzEaZH9LoqcRf3OjLewzVmKJCLLW954R hbSeAjOvM5nnYoXkJxb/9seFFcL0O0D3XdCpwIzygXF9X5l3RSFs2STQIAB6Kg7ZmiQgOc/ G38RXdaR/WTDSibma4DJA== X-UI-Out-Filterresults: notjunk:1;V01:K0:InbUo46ipDs=:lRtCAuZyPeCNCdChBHWi8W 8eYeHd96tTnXx95NxaBir9vKReC+jfth8R0HaYU/A6/0D8iAqBddsrP17ua/vgW5/Uc/DdZuJ AibKdhP0KJA2jONTSbxofRzN9gfsmvC9yOQL1kC2ZPDPgHIlAXcE7RXKiBKc3XTeoMQOi5FAf CTsPsMfGGiRSz4aB1t0dEd5T10bKo/b7vhQ2cktbtjg4pmJXfEE8ifSTP0oSVPb3eH05dPXvl syBDoCDiBCCEmgA3dZKy4sptcL4pJmcFmJlKfBoASbEJdvYvKHzB/NCpBvu7NuXOHt/h4Vwiv 0w50rf4IJvmPIxxKp8qdSmqAFcVvWrKj16GrRqMeH8LFtP2VkdD/yyyuM7o8mCDJ6fxPj9BJB DKzK1MIe4gDePbUcb3/oanLf+LtGUFbM2Md3TYJya3HW2u72osQT4t8u3CttOpcX8f11m/cUB zMs9428fCEV+z6L7965E61T9fMaUE04mQxYQsyAYOslmnhcSb1gIGyd3yFkJYXWZO65tidZKC k8Rh1/WXvhhZXSq5pP12SmsD6DADeMko28Z12PMEacwDpoSa8xtCKtjveJ4PPDrJgHPthTwDa xFd2zZh2tXJr6U0qvtja3dK5ud/e1IsRDU3bvcYKOwrWiJLXIobNLpFui3mIl6IkzaNNEXg0p R3nvJ0fm7qcrYtSiq0YUjh8VPEgEFpgpCXj2RxUsh5DCDXrnZClVgHcTL565WuqUpzurC7RrO z8zetcDSVuAkos58lXj5H9WA+SWvgIQthTv7Xa62NOVPxK1P8hFUW5mL7z9qC4GXxLOM8WiB X-Original-Sender: Jens.Maurer@gmx.net X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of jens.maurer@gmx.net designates 212.227.15.19 as permitted sender) smtp.mailfrom=Jens.Maurer@gmx.net 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:34630 Archived-At: On 10/05/2017 12:26 AM, Niall Douglas wrote: >=20 > Let me remind you all that we have a feature that does what you desir= e without any new keywords or chaining of operations. It is called exceptio= ns. To me it seems that the longer this debate runs the closer we get to ex= ception throwing/catching. I know exception unwinding mechanisms have a bad= reputation for both performance and code size, but who has really done the= measurements to prove this? >=20 >=20 > Actually a lot of people have. SG14 invested lots of effort into this, an= d found no statistically measurable difference if failure was not common. >=20 > However iff failure is anything but rare, then exception throws on table = based handling systems are expensive, about 2000 CPU cycles per frame unwou= nd /minimum/. Table searching is pipeline unfriendly. Could you please give a pointer to a specific paper(s) (URLs)? > This was done during the Boost.Outcome peer review, and people came away = impressed. You might also watch any of my conference videos on this topic e= ..g. the ACCU 2017 one. Could you please give specific pointers (URLs)? And please put those pointers in any upcoming WG21 paper, too. Jens --=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. To view this discussion on the web visit https://groups.google.com/a/isocpp= ..org/d/msgid/std-proposals/59D5DB4C.90403%40gmx.net. .