220 32833 <1dea3831-d801-43ab-9888-40b8364c3f7e@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: Halfdan Ingvarsson Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: std::enum Date: Wed, 21 Jun 2017 05:34:29 -0700 (PDT) Lines: 101 Approved: news@gmane.org Message-ID: <1dea3831-d801-43ab-9888-40b8364c3f7e@isocpp.org> References: <1cdd0fbf-c65d-4034-82d1-a84d4c4f6d1c@isocpp.org> <2426352.kqhfR8YEAN@tjmaciei-mobl1> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_4702_2035059246.1498048469754" X-Trace: blaine.gmane.org 1498048472 1212 195.159.176.226 (21 Jun 2017 12:34:32 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 21 Jun 2017 12:34:32 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBD5MZ4NLUIMRBVWPVHFAKGQEZ2EXLIA@isocpp.org Wed Jun 21 14:34:28 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-io0-f200.google.com ([209.85.223.200]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dNeq3-0008Pw-Kv for gclcip-std-proposals@m.gmane.org; Wed, 21 Jun 2017 14:34:27 +0200 Original-Received: by mail-io0-f200.google.com with SMTP id k93sf2503296ioi.1 for ; Wed, 21 Jun 2017 05:34:31 -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=BeeODbqLPZ3Tn9/cCBvAKKOQrrHMjxB4cteAfCgvemQ=; b=l5JJ17UZmabGcNrS8lHtq7lg0Nea3FmvXA6LljFJbe6YhJ7tIc1dl1O19kvxNLwIhX DWibnovX8fnld9GT6c5xo/dNVzfzJZB6Intq/OJmp5ickSVqGtisl+tyyWouEpDd7WkJ ANgP9+KFgaQtfmnXWXUbyNj+a4/ZGlZrbPaJe9qIskuyArHXR0n0XbN0bSu9LfdSnr82 yX46O8xteWdSa/SvqEWtKYKyjZdhrodqxYa1CKqK+CBrghucMFNJOT58omCn7YqMnIGa ZXygS3drnoNPPzMtGkwRHOdOgRjpblpzRc7jbrXOaOqwWd6YME+6k79wnB/9ob3H+9BA yijg== 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=BeeODbqLPZ3Tn9/cCBvAKKOQrrHMjxB4cteAfCgvemQ=; b=I4wIZisiHmQty/fcQ8KZW8lEC0iPloP5xBVOXmBe3LngUIqBqxeZiAWLIPySmDDKqK /s3SrlVaMJNWmbHwQaGc4E/aHUfr5iaXxxyS8QYdxqHsMqHTJxvLrc0zEmB5O3nF9mKw WQKOH+m/3QQocwzyRRLJkAYfXOjGTca4Mcl57U81pCTLg2M9WXZsbsSP9vBBejGJiL+u b5wuq2oVpRSgU4SS7XdWiy7hMDDm+ZVgrn8HYoTTDiCsCcgMf/KFcNqVkHK7sJ23kid4 H0pWOPRjiePRoaOqeHlZlSi2nyFH3V8KuVe/6rrRcSI0oL8V8EwfPeiuHhbumghScVMV Bqug== 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=BeeODbqLPZ3Tn9/cCBvAKKOQrrHMjxB4cteAfCgvemQ=; b=eFMoBYDhiGswgY9IW27S1dD+0ce2CPD2VmvfRnoG9tdTz0UVi5DcfHEK45pYCDdkAL Ydx43RMq23PMQmWAYII7jwYV188qyBotDeMioRQXv6Hc3voMUKkzApq2Zg9sHzdIyrM0 2/IM8cpVJM+0PoF8Stfbw3LqzdZfM2u+fWqnN1/2pmoFcBVKoFEbhLuH+YSNCWS9rnUZ Px1IQDD83EVAPyPH8cci06N/kAddME6Z4Br07NqodExJQ9xejo+9/4kWM4aELI/uv6ow d+qAPSvGty3B3h0InaGxCqzzYPGuBOcpkIxVCEcUy60d2ycQVlktnOGLx2WFzfddj+ps 1UvA== X-Gm-Message-State: AKS2vOwYXF1ghjYFcPqW87mHQL07ueFz5oBU9uamuIZmen8AovvaPiw0 37AFyuDfH+UF4YeD X-Received: by 10.36.40.13 with SMTP id h13mr4491781ith.39.1498048470962; Wed, 21 Jun 2017 05:34:30 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.43.178 with SMTP id u47ls3890781ota.16.gmail; Wed, 21 Jun 2017 05:34:30 -0700 (PDT) X-Received: by 10.157.46.132 with SMTP id w4mr679604ota.18.1498048470233; Wed, 21 Jun 2017 05:34:30 -0700 (PDT) In-Reply-To: <2426352.kqhfR8YEAN@tjmaciei-mobl1> X-Original-Sender: halfdan@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:32833 Archived-At: ------=_Part_4702_2035059246.1498048469754 Content-Type: multipart/alternative; boundary="----=_Part_4703_1517395180.1498048469754" ------=_Part_4703_1517395180.1498048469754 Content-Type: text/plain; charset="UTF-8" On Wednesday, June 21, 2017 at 12:06:54 AM UTC-4, Thiago Macieira wrote: > > On Tuesday, 20 June 2017 20:34:28 PDT Halfdan Ingvarsson wrote: > > I'd like to propose a simple, but very useful utility class for the > > standard library: std::enum. > > You need to find a different name. We can't have a class whose name is a > reserved keyword. > Er. Yes. std::enum_array. It got lost in the wash. > You're asking for enum reflection. There are many proposals about that, > both > restricted to enums as well as generic (reflection for everything). The > restricted proposals haven't gained much traction, so everything now > depends > on the full reflection proposals being accepted. > Indeed. So far, the only proposal I've seen where I can easily enumerate an enum in a for-each, is the one from Sutton and Sutter (P0590R0). The rest are a form of a ::get() template, where, if the proposal doesn't include it, one would be forced to write some variadic template magic to cover that aspect. However, the front-runner reflection proposals all rely on the existence of concepts in the standard, which makes me think that we're nowhere near anything resembling reflection for a long time indeed. -- 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/1dea3831-d801-43ab-9888-40b8364c3f7e%40isocpp.org. ------=_Part_4703_1517395180.1498048469754 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Wednesday, June 21, 2017 at 12:06:54 AM UTC-4, Thiago M= acieira wrote:
On Tuesday, 20 J= une 2017 20:34:28 PDT Halfdan Ingvarsson wrote:
> I'd like to propose a simple, but very useful utility class fo= r the
> standard library: std::enum.

You need to find a different name. We can't have a class whose name= is a=20
reserved keyword.

Er. Yes. std::enum_array. It got lost = in the wash.
=C2=A0
You're asking for enum reflection. There are many proposals about= that, both=20
restricted to enums as well as generic (reflection for everything). The= =20
restricted proposals haven't gained much traction, so everything no= w depends=20
on the full reflection proposals being accepted.

Indeed.=C2=A0

So far, the only proposal I've seen where I can easily enumerate an en= um in a for-each, is the one from Sutton and Sutter (P0590R0). The rest are= a form of a <foo>::get<I>() template, where, if the proposal d= oesn't include it, one would be forced to write some variadic template = magic to cover that aspect.

However, the front-run= ner reflection proposals all rely on the existence of concepts in the stand= ard, which makes me think that we're nowhere near anything resembling r= eflection for a long time indeed.

--
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 https://groups.google.= com/a/isocpp.org/d/msgid/std-proposals/1dea3831-d801-43ab-9888-40b8364c3f7e= %40isocpp.org.
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