220 33531 article Path: news.gmane.org!.POSTED!not-for-mail From: Barry Revzin Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Catch block for multiple exceptions Date: Wed, 2 Aug 2017 05:47:38 -0700 (PDT) Lines: 97 Approved: news@gmane.org Message-ID: References: <4126837.jZlGhgVnua@tjmaciei-mobl1> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_1426_1562684480.1501678058997" X-Trace: blaine.gmane.org 1501678069 6990 195.159.176.226 (2 Aug 2017 12:47:49 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 2 Aug 2017 12:47:49 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCJJTG7CS4ARB24TQ7GAKGQEHU7RG6A@isocpp.org Wed Aug 02 14:47:45 2017 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 1dct3n-00013g-Ed for gclcip-std-proposals@m.gmane.org; Wed, 02 Aug 2017 14:47:35 +0200 Original-Received: by mail-it0-f70.google.com with SMTP id o19sf39723650ito.5 for ; Wed, 02 Aug 2017 05:47:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; 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; bh=+IjPP4usLvKrnjw/VzypPfRrMkd1VxxAzoPhJq+/fK0=; b=P3kTNRjRa0RGvleGdjYIBK3dmnHoCdoAMvDzqsuPAnsjxgbFRofimtBDRXpJVDwQR+ rBMmtkWh7KWri5mrym/9vCHaov5vFOC23J1dsrqeZxKnnPa+Aww17b00JaJ176sjqPsp soyEDLbS7Nr8rWh+DkKlWB9Cnk4TK1BTrtkVVmsFNudTf9gzhx68Xm0TMasSbllFZhCA 5neSPbMgo23M7CUkK/DQzLXD8SPw4SCW1oxNgJ3Dy0daB3PlEPyn5pnTfCsT/3WN3irO K6BDNhuCPIOd0bgFtYWPFTcspokrbRGVgvzVYE5opfhf/LyiCRmp/07gYOKb67EHjXZj x5GQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; 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; bh=+IjPP4usLvKrnjw/VzypPfRrMkd1VxxAzoPhJq+/fK0=; b=DE9QE8vIugRZP1Wbp3TYCfoRG2y/COcHVRGZUueSyMgxZ/g2KZaTirNo0SEvSW/P+c t1RWMdjwCWL+3a4tSjcxbGmcuhr6fwf1nbZIjGXeMMLih7MJvWYpbSVPUUGxDMKRadRx 7S5YSNGDoCM7tUuXaAHt40izhiP8QkwAYcRqVUtD10exronMY/AarYbwdBQ+XGSNgpEM q5hYwFgFdzgoaZYAwTGvKJvV2fPACHmD6fTee41y5ZrO+E7ZCpLtoxSdaTYCB8DagoKN JIMuAM9ujTI4crDUwoNEGqXBzaupQ9i72lrvE5ex4pzA+4Kzu+SFdWvPxPA4Idj3BMHF Z10Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; 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:x-spam-checked-in-group:list-post:list-help :list-archive:list-subscribe:list-unsubscribe; bh=+IjPP4usLvKrnjw/VzypPfRrMkd1VxxAzoPhJq+/fK0=; b=MCWOExCvfJjJYF0srqx8R8EEUonPkkbp1LNZGVuV5fxdqg+yb0gAdi6kDSUJenJA7t wEaO1F0X7ReUucMGHc6n5O5+XsAEn1ZYs/Tq0waB7WpjVBnN5RbjZ795efJG2Hcb1F9s eZYDgywZv555f2L9XSBQpIQ2YTdiHIWqWESHVxP1ohnbnT8s0/SqVsse9TI3okqmBOLH 70HHew0o4mK7/TP2dzg31Z7BXWmI15mYT1xVEaPoIhwJKQs3VK3Yy7V5s5CDrBQJu0BC YoqIxIIizst2UdNVXU1kkC/et70CbrAF5rRTCFqgkYZPOaYJMgM4Uqr7T9haxL97BdbA EY+g== X-Gm-Message-State: AIVw111R5HTXF5qPbZoJRZNvDsDkJg8DEKerI30KkkeSizdPKAvM0LT6 HIHxxSijjrWWhp3P X-Received: by 10.107.13.148 with SMTP id 142mr15894241ion.44.1501678061000; Wed, 02 Aug 2017 05:47:41 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.21.2 with SMTP id 2ls11991501iov.21.gmail; Wed, 02 Aug 2017 05:47:39 -0700 (PDT) X-Received: by 10.31.142.14 with SMTP id q14mr63935vkd.19.1501678059512; Wed, 02 Aug 2017 05:47:39 -0700 (PDT) In-Reply-To: <4126837.jZlGhgVnua@tjmaciei-mobl1> X-Original-Sender: Barry.Revzin@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:33531 Archived-At: ------=_Part_1426_1562684480.1501678058997 Content-Type: multipart/alternative; boundary="----=_Part_1427_272495081.1501678058997" ------=_Part_1427_272495081.1501678058997 Content-Type: text/plain; charset="UTF-8" > > And how to know which one invoked? You don't. If you wanted to know if it > was > exceptionA, you'd add a catch block for it. > You'd almost want something like: catch (variant e) { visit([](auto& e){ f(e); }, e); } Granted that's a fairly large change to how the catch mechanics currently work... -- 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/d14636de-fb57-47b3-8666-7976ccdb6fe8%40isocpp.org. ------=_Part_1427_272495081.1501678058997 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
And how to kn= ow which one invoked? You don't. If you wanted to know if it was=20
exceptionA, you'd add a catch block for it. =C2=A0
=C2=A0

You'd almost want something like:

catch (variant= <exceptionA&, exceptionB&, exceptionC&> e) {
=C2=A0 =C2=A0 visit([](auto& e= ){ f(e); }, e);=
}

Granted that's a fairly large change to= how the catch mechanics currently work...=C2=A0

--
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