220 27941 article Path: news.gmane.org!.POSTED!not-for-mail From: Larry Evans Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Make (strongly typed) enums castable to char const * const Date: Thu, 25 Aug 2016 10:41:15 -0500 Lines: 36 Approved: news@gmane.org Message-ID: References: <1472132849.17129.9.camel@bsdforen.de> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed X-Trace: blaine.gmane.org 1472139696 11061 195.159.176.226 (25 Aug 2016 15:41:36 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 25 Aug 2016 15:41:36 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDAYTI72VMGRBJVD7S6QKGQEHEUQJHA@isocpp.org Thu Aug 25 17:41:30 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lf0-f71.google.com ([209.85.215.71]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bcwmV-000241-9n for gclcip-std-proposals@m.gmane.org; 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Thu, 25 Aug 2016 08:41:26 -0700 (PDT) X-Received: by 10.25.212.212 with SMTP id l203mr2257074lfg.2.1472139686372; Thu, 25 Aug 2016 08:41:26 -0700 (PDT) Original-Received: from blaine.gmane.org ([195.159.176.226]) by mx.google.com with ESMTPS id j195si6405790lfj.140.2016.08.25.08.41.26 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 25 Aug 2016 08:41:26 -0700 (PDT) Received-SPF: neutral (google.com: 195.159.176.226 is neither permitted nor denied by best guess record for domain of gclcip-std-proposals@m.gmane.org) client-ip=195.159.176.226; Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1bcwmP-0001X6-FE for std-proposals@isocpp.org; Thu, 25 Aug 2016 17:41:21 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 29 Original-X-Complaints-To: usenet@blaine.gmane.org In-Reply-To: X-Original-Sender: cppljevans@suddenlink.net X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 195.159.176.226 is neither permitted nor denied by best guess record for domain of gclcip-std-proposals@m.gmane.org) smtp.mailfrom=gclcip-std-proposals@m.gmane.org 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:27941 Archived-At: On 08/25/2016 09:12 AM, Ville Voutilainen wrote: > On 25 August 2016 at 16:47, Dominic Fandrey wrote: >> I searched this list for similar suggestions, but of course I may >> have overlooked something. >> >> I frequently use the following pattern: >> >> enum class FooBar { KEKS, DOSE }; >> char const * const FooBarStr[]{"KEKS", "DOSE"}; >> >> I use the strings to in error messages, verbose output, etc. >> >> FooBarStr[static_cast(FooBar::KEKS)] // "KEKS" >> >> This has some disadvantages, e.g. enums with explicitly stated values >> may have gaps, negative values and may be defined out of order. >> Also, changing the enum also means changing the strings manually. >> >> What I'd like to see: >> >> static_cast(FooBar::KEKS) // "KEKS" > > > See http://open-std.org/JTC1/SC22/WG21/docs/papers/2016/p0194r1.html > Could you be more specific. I grepped for enumName, for char const*, and scanned briefly for other strings that might show where conversion from enum to char const* might be, without success :( -- 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/npn3iq%244ah%241%40blaine.gmane.org. .