220 9903 article Path: news.gmane.org!not-for-mail From: Matthew Woehlke Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Explicitly-defaulted enumeration operators Date: Wed, 19 Mar 2014 13:48:31 -0400 Lines: 43 Approved: news@gmane.org Message-ID: References: <3B09C97E-7ADE-49ED-8C31-B5B41CD3DDE7@gmail.com> <781009e3-cd3c-4cb8-b034-b51a7c97c750@isocpp.org> <10450602-fee9-48c4-9fa2-d000e434f5fb@isocpp.org> <6F532E62-C10A-404A-8F0D-662B7EA3D202@gmail.com> <24e85eaf-e67b-4a0b-acee-47d996d6f6ee@isocpp.org> <7F327393-B9EF-46EB-A40E-86F80EFEF5BD@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed X-Trace: ger.gmane.org 1395251332 31922 80.91.229.3 (19 Mar 2014 17:48:52 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 19 Mar 2014 17:48:52 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCO5FYHBU4ERBCNRU6MQKGQENYPHDWY@isocpp.org Wed Mar 19 18:49:01 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-we0-f200.google.com ([74.125.82.200]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1WQKbq-0000q3-Ep for gclcip-std-proposals@m.gmane.org; Wed, 19 Mar 2014 18:48:58 +0100 Original-Received: by mail-we0-f200.google.com with SMTP id p61sf14006032wes.11 for ; Wed, 19 Mar 2014 10:48:58 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:to:from:subject:date:lines:message-id:references :mime-version:user-agent:in-reply-to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe:content-type; bh=DCRlsdz47w7XEtQrv7l8GUbm2iItaDQl0q25pjvglqs=; b=YnscIl7iMzKIZJboTUJR7o3GaQB11MKmADmC0/Yy8O24H2CfUvTL/R94o9yScGGhWz O0hzLWlsGhg6q6v98H/NPGe8o484++dGafo3FPba+1l4SRDEi/vIV3sBzCOwyylS2+Lz B/3Mrczj5lsMgG0RAR6GrgmHJzizGqvjlR2JimlWdWpcXwZJmNlq2nmF8rv8Rc/s+puP Xxi7Jxpzba8D+jrEExheGu+6ene7X9tLC1mAsc0RoE/KfcKeHJHDJ5nEmoRQEv0wjIuG ZqYkgL8CwE8eMka91vUvkmBVJjnRzK2FRTiA57s/L2FED3gDa9wtKtt1YzyTypJvib1X Mxhw== X-Gm-Message-State: ALoCoQmJ6bxj00TKGaFUoWFI3mhS8emSYaOgbPBJzjuxpZhlgLxNx5E+6K7n49pSl/FrVvDsre0H X-Received: by 10.112.144.165 with SMTP id sn5mr13963780lbb.11.1395251338126; Wed, 19 Mar 2014 10:48:58 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.152.234.172 with SMTP id uf12ls361147lac.85.gmail; Wed, 19 Mar 2014 10:48:57 -0700 (PDT) X-Received: by 10.152.246.43 with SMTP id xt11mr2696502lac.34.1395251337081; Wed, 19 Mar 2014 10:48:57 -0700 (PDT) Original-Received: from plane.gmane.org (plane.gmane.org. [80.91.229.3]) by mx.google.com with ESMTPS id y6si16641054lal.194.2014.03.19.10.48.56 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Wed, 19 Mar 2014 10:48:56 -0700 (PDT) Received-SPF: pass (google.com: domain of gclcip-std-proposals@m.gmane.org designates 80.91.229.3 as permitted sender) client-ip=80.91.229.3; Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1WQKbf-0000WQ-3R for std-proposals@isocpp.org; Wed, 19 Mar 2014 18:48:47 +0100 Original-Received: from tripoint.kitware.com ([66.194.253.20]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 19 Mar 2014 18:48:47 +0100 Original-Received: from mw_triad by tripoint.kitware.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 19 Mar 2014 18:48:47 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 34 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: tripoint.kitware.com User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0 In-Reply-To: X-Original-Sender: mw_triad@users.sourceforge.net X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of gclcip-std-proposals@m.gmane.org designates 80.91.229.3 as permitted sender) smtp.mail=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:9903 Archived-At: On 2014-03-18 01:01, Matheus Izvekov wrote: > Hmm, but suppose you could write something like this: > > enum class flags : uint32_t { > foo = 1, bar = 2, baz = 4; > flags operator|(flags,flags) = default; > }; That would be awesome. In fact I have a 'to do' to suggest exactly this. std::flags might cover that specific use case, but I also want to be able to do things like: enum class foo { ...values... foo(std::string const*); // constructor operator std::string(); // conversion operator }; (These sorts of conversions already show up frequently, but right now must be implemented as free functions; the ability to make them members would be great.) Something else I would really love to see though is using an enumeration as an underlying ("base") type of an enumeration, e.g.: enum class A { a1, a2, ... }; enum class B : A { b1, b2, ... }; B bb = B::a1; // legal; a1, etc. are in scope of B, inherited from A -- Matthew -- --- 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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