220 33540 article Path: news.gmane.org!.POSTED!not-for-mail From: Ville Voutilainen Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Catch block for multiple exceptions Date: Wed, 2 Aug 2017 21:40:31 +0300 Lines: 62 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: text/plain; charset="UTF-8" X-Trace: blaine.gmane.org 1501699238 24371 195.159.176.226 (2 Aug 2017 18:40:38 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 2 Aug 2017 18:40:38 +0000 (UTC) To: "ISO C++ Standard - Future Proposals" Original-X-From: std-proposals+bncBC5JHI7A7ALRBINZRDGAKGQEP5BZIFQ@isocpp.org Wed Aug 02 20:40:34 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pg0-f69.google.com ([74.125.83.69]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dcyZJ-0005mt-74 for gclcip-std-proposals@m.gmane.org; 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[2607:f8b0:400c:c05::22d]) by mx.google.com with ESMTPS id r45si15341291uai.111.2017.08.02.11.40.33 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 02 Aug 2017 11:40:33 -0700 (PDT) Received-SPF: pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:400c:c05::22d as permitted sender) client-ip=2607:f8b0:400c:c05::22d; Original-Received: by mail-vk0-x22d.google.com with SMTP id d124so21287988vkf.2 for ; Wed, 02 Aug 2017 11:40:33 -0700 (PDT) X-Received: by 10.31.134.207 with SMTP id i198mr15195093vkd.72.1501699232630; Wed, 02 Aug 2017 11:40:32 -0700 (PDT) Original-Received: by 10.103.103.65 with HTTP; Wed, 2 Aug 2017 11:40:31 -0700 (PDT) In-Reply-To: X-Original-Sender: ville.voutilainen@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.b=WHiNd1BI; spf=pass (google.com: domain of ville.voutilainen@gmail.com designates 2607:f8b0:400c:c05::22d as permitted sender) smtp.mailfrom=ville.voutilainen@gmail.com; dmarc=pass (p=NONE sp=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:33540 Archived-At: On 2 August 2017 at 21:05, Ricardo Fabiano de Andrade wrote: > Hum, a template... bikeshedding an alternate syntax: > > catch(auto& e) { > ... do something > } Boo hiss. Let's just write a solution with the toys C++17 gives us. Put handler_helper into a local library of yours and use it like I use it in main: #include #include struct ExcA { void common() const {std::cout << "common in ExcA" << std::endl;} }; struct ExcB { void common() const {std::cout << "common in ExcB" << std::endl;} }; struct ExcC { void common() const {std::cout << "common in ExcC" << std::endl;} }; template void handler_helper(Handler h) { ([&](auto&& a) { try { throw; } catch (const decltype(*a)& exc) { h(exc); } catch (...) { } }(std::add_pointer_t()),...); } int main() { try { //throw ExcA(); //throw ExcB(); throw ExcC(); } catch (...) { handler_helper([](auto&& c) { c.common(); }); } } -- 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. 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