220 27984 article Path: news.gmane.org!.POSTED!not-for-mail From: szollosi.lorand@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Make (strongly typed) enums castable to char const * const Date: Fri, 26 Aug 2016 16:30:56 -0700 (PDT) Lines: 139 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: multipart/mixed; boundary="----=_Part_2302_750984371.1472254257014" X-Trace: blaine.gmane.org 1472254263 4839 195.159.176.226 (26 Aug 2016 23:31:03 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 26 Aug 2016 23:31:03 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDR7PROGSALRBMVCQO7AKGQEZ7DTTYQ@isocpp.org Sat Aug 27 01:30:59 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pf0-f198.google.com ([209.85.192.198]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bdQaQ-0000ku-My for gclcip-std-proposals@m.gmane.org; Sat, 27 Aug 2016 01:30:58 +0200 Original-Received: by mail-pf0-f198.google.com with SMTP id 63sf175866768pfx.0 for ; Fri, 26 Aug 2016 16:30:59 -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 :x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=ajsfFO/DGH+41Z0V1OX8yQZknoUzJ4Wngpa2H/cB0aI=; b=HKY/KEVvaKEQKbZovTCme/xMWKQNVQj2qMukZ5zf1AehAzh+TPAqzw2VeIVjcmnyqj Fchv6B6ik8i9Yh9/GPhs3PEylU/iK4mmqd2Q7Ntze3jxe6TDBrityQ5o656039WlSTBr oxfQ9BEF8a88725tM3CBud0Rjb7VBqvlZFwcqkrBzHmUP/Ee0eQm47P6p7y4s/+YycNg uo8pFp3VRGICw0ft11NAi46fQiyr6usKGXUD+gvWo+XUBDJEdX11ljSFJKHo4ybwpgS6 PMQaTqcvtVbencgAxN/cJej3Wb4/R4t+v3m3VLnXDd0Y60QWZR6pfwkW41dikvNLEtId h1iw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=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=ajsfFO/DGH+41Z0V1OX8yQZknoUzJ4Wngpa2H/cB0aI=; b=1B6a1LAfmPVqhfHwzLbIq1nxVPpdChjuO25hFeaaCGhIXZe1CoxFiDZ+hpQOSThetg VgLbejJ9/Q5Pj3r4/i2W4v5oqqVI+htgAIYVRmXHHXeTr4N+egQDQt/u9ZAI9y815OPX PSzut1RhaHkWAO0cNj7h42ckWhEkKG0CIPBo+2oQuhEQ8KPLT5NyVNp3zT+gjj1jWqpa mX8lX3LbVnCPFybqZF1D9s2MbXxhD28ikie7ypabVlL0ich5zDzoY8EFFSCEB5d7VsW2 w7DLqO9M7tPzw3UAlQviXIi6Bu2wDPeA6jGyf0QPKW4dAeggxqtPH9BpDCl0MxsRczAo 7GKg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; 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=ajsfFO/DGH+41Z0V1OX8yQZknoUzJ4Wngpa2H/cB0aI=; b=KHuU97h+H/c2YTHY9Wno/fzIyFh5OcW/l4c+6lyjbHoZT08G05thGRGEDjmPRu8SNu RGiaamJtYpePpD6cr8+19XRrPLOyyCdTp74AOWYJlw3hwhxPaZWiKGGLUWgLvHoYH4cP N/FQo1nGACL9wcZxApp9j9bbdmzYcreHOlYpKkO2xnq2wk8IdW8TUZbGnpmWhvuoBT7q /dHqXahTAdrdX6SQ//X1jJl7GoaElSNAIzDqi/tb2BYUFyiuTeAmxdb/z3QHX3LWwoQD ioQENfIzgXoUA2ZJJ7Wa50boI6IY5BHRLVri3QK3Q1VRHzTlVPBbNFjxjLsd0WQKgnAP wTDg== X-Gm-Message-State: AE9vXwNGhVx0T6wMMVyn9iZm93/B4bw9R3451MKt6Z8tRSzM6Ah37S+jg2WNur7cBeKS+w== X-Received: by 10.66.170.208 with SMTP id ao16mr4611048pac.9.1472254259169; Fri, 26 Aug 2016 16:30:59 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.200.85 with SMTP id y82ls1710766iof.24.gmail; Fri, 26 Aug 2016 16:30:58 -0700 (PDT) X-Received: by 10.36.239.3 with SMTP id i3mr103048ith.2.1472254258001; Fri, 26 Aug 2016 16:30:58 -0700 (PDT) In-Reply-To: <1472132849.17129.9.camel@bsdforen.de> X-Original-Sender: szollosi.lorand@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:27984 Archived-At: ------=_Part_2302_750984371.1472254257014 Content-Type: multipart/alternative; boundary="----=_Part_2303_989579670.1472254257014" ------=_Part_2303_989579670.1472254257014 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi, I hate to troll in (esp. since I'm top-posting :) ), but you know that you= =20 can achieve this using macro-metaprogrammed FOREACH(); or, if you're okay= =20 with uintptr_t values and don't care about enum values, you can use string= =20 addresses (when you put strings in a struct using a macro), which is way=20 more readable? Regards, -lorro 2016. augusztus 25., cs=C3=BCt=C3=B6rt=C3=B6k 15:47:34 UTC+2 id=C5=91pontba= n Kamikaze Dominic=20 Fandrey a k=C3=B6vetkez=C5=91t =C3=ADrta: > > I searched this list for similar suggestions, but of course I may=20 > have overlooked something.=20 > > I frequently use the following pattern:=20 > > enum class FooBar { KEKS, DOSE };=20 > char const * const FooBarStr[]{"KEKS", "DOSE"};=20 > > I use the strings to in error messages, verbose output, etc.=20 > > FooBarStr[static_cast(FooBar::KEKS)] // "KEKS"=20 > > This has some disadvantages, e.g. enums with explicitly stated values=20 > may have gaps, negative values and may be defined out of order.=20 > Also, changing the enum also means changing the strings manually.=20 > > What I'd like to see:=20 > > static_cast(FooBar::KEKS) // "KEKS"=20 > > I think this would be simple to add to an existing compiler and it's=20 > very unlikely to clash with existing code, because you have to jump=20 > through some hoops to cast a strongly typed enum to a pointer type.=20 > > --=20 > A: Because it fouls the order in which people normally read text.=20 > Q: Why is top-posting such a bad thing?=20 > A: Top-posting.=20 > Q: What is the most annoying thing on usenet and in e-mail?=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. To view this discussion on the web visit https://groups.google.com/a/isocpp= ..org/d/msgid/std-proposals/a057117d-4d32-4f39-ac2b-ada996a75ec3%40isocpp.or= g. ------=_Part_2303_989579670.1472254257014 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi,

I hate to troll in (esp. since I'm top-post= ing :) ), but you know that you can achieve this using macro-metaprogrammed= FOREACH(); or, if you're okay with uintptr_t values and don't care= about enum values, you can use string addresses (when you put strings in a= struct using a macro), which is way more readable?

Regards,
-lor= ro

2016. augusztus 25., cs=C3=BCt=C3=B6rt=C3=B6k 15:47:34 UTC+2 id= =C5=91pontban Kamikaze Dominic Fandrey a k=C3=B6vetkez=C5=91t =C3=ADrta:I searched this list for similar = suggestions, but of course I may
have overlooked something.

I frequently use the following pattern:

=C2=A0 =C2=A0 enum class FooBar { KEKS, DOSE };
=C2=A0 =C2=A0 char const * const FooBarStr[]{"KEKS", "DO= SE"};

I use the strings to in error messages, verbose output, etc.

=C2=A0 =C2=A0 FooBarStr[static_cast<int>(FooBar::KEKS)] // &= quot;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:

=C2=A0 =C2=A0 static_cast<char const *>(FooBar::KEKS) // "KE= KS"

I think this would be simple to add to an existing compiler and it'= s
very unlikely to clash with existing code, because you have to jump
through some hoops to cast a strongly typed enum to a pointer type.

--=20
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?


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