220 27946 article Path: news.gmane.org!.POSTED!not-for-mail From: "D. B." Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Make (strongly typed) enums castable to char const * const Date: Thu, 25 Aug 2016 19:21:52 +0100 Lines: 105 Approved: news@gmane.org Message-ID: References: <1472132849.17129.9.camel@bsdforen.de> <1472148645.17129.15.camel@bsdforen.de> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a1146a0dcde811f053ae978e2 X-Trace: blaine.gmane.org 1472149325 15221 195.159.176.226 (25 Aug 2016 18:22:05 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 25 Aug 2016 18:22:05 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCWNZ4ECS4GBBQXO7S6QKGQETB2UTIA@isocpp.org Thu Aug 25 20:21:59 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-lf0-f70.google.com ([209.85.215.70]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bczHm-00036s-3s for gclcip-std-proposals@m.gmane.org; Thu, 25 Aug 2016 20:21:54 +0200 Original-Received: by mail-lf0-f70.google.com with SMTP id e7sf37503903lfe.0 for ; Thu, 25 Aug 2016 11:21:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:x-spam-checked-in-group:list-post :list-help:list-archive:list-subscribe:list-unsubscribe; bh=JCzieGSAFhp85oyqpXJeIadn8NVNr97njUBdOiTvV1U=; b=n12QXTLG40lmyOLDc1zt5xA5dhH1nGfuyyr0uDYZ1kIFGOLaC5NMKTdeRY5gry9q0h ig5s5Ru0TZoxYjACaPzJ43Ald9Sfad60m9O/MVKvq2VplWoV9u008CqwhhrXs9Al3F9/ RXX8i+oPI3z1PZWYjKUHghgiGp8B7ChYXjzrQ3kIx4OJjXwa8LR6QxmGPFruzCS5f6TT wi5nv1vXbfjE5Syf4yIhjZTLReB5v6IsjEgV6RLjEuH94epHARF5eT9S8N7MMeXSBThb Q6XUY/2eN2BkwFoXSpcHndqnmOQJ4t4aWbU4rs4v2jvGMowCIZVOElYvLySM9hsbJd3T EowA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=JCzieGSAFhp85oyqpXJeIadn8NVNr97njUBdOiTvV1U=; b=FDoEP6QeAEy8AbqhZm4oQNann02w+bpQ3u51ZQBDzK8yDPOFm0s42tS8HcVYYzIgFx zBCn5MLtKoH1Jj5Sm0pAIIq0onli1PcPaoSUDM6hM/3RCk5/Bogl664C7p6HH2+0C4iv If7zKTsHF4iipbIn/WT0UH1sp2sKCdyG47syKz1gEXZxvB+vaqQNoqlIhvFbV9tyWoDu DNA9hcE+Wc0WPJ/Z7kN8Sta+Ikltpz98Lrijrbtx/f72YiE6DzoF6W00UoKRdl+SEF8B Y7kPt34LLCvqM4oCL3veMX2x+eInNC1PEAKNA3XvbK8mFjUSm5b719L47hT9DZypnqh0 kbUQ== X-Gm-Message-State: AE9vXwMTf5peBJSLx6qKzPP7zR7XMfuben/MNKc9QGinBk+gJFzKjQ6b5j/T9ClOIA42GA== X-Received: by 10.25.33.198 with SMTP id h189mr1495369lfh.5.1472149315038; Thu, 25 Aug 2016 11:21:55 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.28.66.80 with SMTP id p77ls155960wma.26.canary; Thu, 25 Aug 2016 11:21:53 -0700 (PDT) X-Received: by 10.194.15.130 with SMTP id x2mr8800110wjc.122.1472149313606; Thu, 25 Aug 2016 11:21:53 -0700 (PDT) Original-Received: from mail-wm0-x231.google.com (mail-wm0-x231.google.com. [2a00:1450:400c:c09::231]) by mx.google.com with ESMTPS id bx5si15036937wjc.22.2016.08.25.11.21.53 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 25 Aug 2016 11:21:53 -0700 (PDT) Received-SPF: pass (google.com: domain of db0451@gmail.com designates 2a00:1450:400c:c09::231 as permitted sender) client-ip=2a00:1450:400c:c09::231; Original-Received: by mail-wm0-x231.google.com with SMTP id f65so249178415wmi.0 for ; Thu, 25 Aug 2016 11:21:53 -0700 (PDT) X-Received: by 10.28.111.4 with SMTP id k4mr9833728wmc.94.1472149313186; Thu, 25 Aug 2016 11:21:53 -0700 (PDT) Original-Received: by 10.28.15.15 with HTTP; Thu, 25 Aug 2016 11:21:52 -0700 (PDT) In-Reply-To: <1472148645.17129.15.camel@bsdforen.de> X-Original-Sender: db0451@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com; spf=pass (google.com: domain of db0451@gmail.com designates 2a00:1450:400c:c09::231 as permitted sender) smtp.mailfrom=db0451@gmail.com; dmarc=pass (p=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:27946 Archived-At: --001a1146a0dcde811f053ae978e2 Content-Type: text/plain; charset=UTF-8 On Thu, Aug 25, 2016 at 7:10 PM, Dominic Fandrey wrote: > On Thu, 2016-08-25 at 16:55 +0100, D. B. wrote: > > On Thu, Aug 25, 2016 at 4:17 PM, Derek Ross > wrote: > > > > > > > > Note that enums can have duplicate values, which throws a wrench into > the > > > reflection works. E.g.: > > > > > > enum class FooBar { KEKS = 2, DOSE = 2 }; > > > > > > What will the result be for: > > > > > > FooBar fb = FooBar::KEKS; > > > cout << static_cast(fb) ; > > > > > that only "throws a wrench into the reflection works" as proposed by the > > OP, by no means generally. the WG proposal linked (A) would not support > > this because it is static and (B) has presumably already accounted for > such > > possibilities and effortlessly gets around them with compile-time > > wizardry... again, *presumably.* > > > > It's not really useful for what I'm doing if it's not runtime capable. > Then I am not an 'insider' and might well be wrong... but based on how static C++ is, I would not expect such a feature to arrive, or really any other dynamic features, beyond the 'necessary evils' of dynamic_cast/typeinfo. -- 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/CACGiwhGBkjL_dw%2BfMx_GgYwZmg6O-gKLTVJVanerYU8AZN-kLA%40mail.gmail.com. --001a1146a0dcde811f053ae978e2 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On T= hu, Aug 25, 2016 at 7:10 PM, Dominic Fandrey <kamikaze@bsdforen.de= > wrote:
On Th= u, 2016-08-25 at 16:55 +0100, D. B. wrote:
> On Thu, Aug 25, 2016 at 4:17 PM, Derek Ross <antiquarktv@gmail.com> wrote:
>
> >
> > Note that enums can have duplicate values, which throws a wrench = into the
> > reflection works.=C2=A0=C2=A0E.g.:
> >
> > enum class FooBar { KEKS =3D 2, DOSE =3D 2 };
> >
> > What will the result be for:
> >
> > FooBar fb =3D FooBar::KEKS;
> > cout << static_cast<char const*>(fb) ;
> >
> that only "throws a wrench into the reflection works" as pro= posed by the
> OP, by no means generally. the WG proposal linked (A) would not suppor= t
> this because it is static and (B) has presumably already accounted for= such
> possibilities and effortlessly gets around them with compile-time
> wizardry... again, *presumably.*
>

It's not really useful for what I'm doing if it's not runtime c= apable.


Then I am not an 'insid= er' and might well be wrong... but based on how static C++ is, I would = not expect such a feature to arrive, or really any other dynamic features, = beyond the 'necessary evils' of dynamic_cast/typeinfo.=C2=A0

--
You received this message because you are subscribed to the Google Groups &= quot;ISO C++ Standard - Future Proposals" group.
To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposa= ls+unsubscribe@isocpp.org.
To post to this group, send email to std-proposals@isocpp.org.
To view this discussion on the web visit h= ttps://groups.google.com/a/isocpp.org/d/msgid/std-proposals/CACGiwhGBkjL_dw= %2BfMx_GgYwZmg6O-gKLTVJVanerYU8AZN-kLA%40mail.gmail.com.
--001a1146a0dcde811f053ae978e2-- .