220 30466 <5875286B.7040604@gmail.com> article Path: news.gmane.org!.POSTED!not-for-mail From: Matthew Woehlke Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: enum_cast proposal Date: Tue, 10 Jan 2017 13:31:07 -0500 Lines: 22 Approved: news@gmane.org Message-ID: <5875286B.7040604@gmail.com> References: <57258435-5d82-48e7-8ed7-3c38682418fb@isocpp.org> <58750288.5080004@gmail.com> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Trace: blaine.gmane.org 1484073078 7131 195.159.176.226 (10 Jan 2017 18:31:18 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 10 Jan 2017 18:31:18 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC37LBFWUIFBB3GQ2TBQKGQEDXKSRPA@isocpp.org Tue Jan 10 19:31:14 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wm0-f72.google.com ([74.125.82.72]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cR1CM-0000ex-C8 for gclcip-std-proposals@m.gmane.org; Tue, 10 Jan 2017 19:31:06 +0100 Original-Received: by mail-wm0-f72.google.com with SMTP id l2sf23245492wml.5 for ; Tue, 10 Jan 2017 10:31:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-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=qKH8HktjB+H5GF39VpAV2UNb9K2BuUkuxgAyvJdccAE=; b=Cqic5U+RgxQa2RMj8kfKa0O8h6SOumy/EjMWspyQxq2geep/rh/w0M0qWRt/FxkaI0 DmQedTjINsBlKR2Y838vBSipwDicXp3rfxYVN9vNYw20InymC1j5mcR+5w1jq8eWuUvU Ras/jr/GXwMse4z/C5hKndoycj9Dz5hWh7Qfz7r3Ym9fsdWHwwQiIb/ANHaTEVpYRi6m Lf0jWYhvPcq6ji0p99uYPoKYhbpHWNhCXXItVOcaHwfSey5di0DvzttCNjMcLh0bdDiC rLmnv6wq2Ra7r2AKwr3YeVYY6BgUOqQW90Gx3e3JnHG1G1NwaMzw/dyDd1jJztWjNCNu Q1/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-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=qKH8HktjB+H5GF39VpAV2UNb9K2BuUkuxgAyvJdccAE=; b=NUe7O9YZpp8q8CXAHf6Krpvfd68U9jeLQsqPbrvQZUOWY6QdEkH5i1B3HptyiFiaXd G3ggI3ArVX5Z5jNunxKGLrNeKjnoO9SM5A9fxBkGe7cYk8tVSeCqybnGm4ePWX8DfkMs d9PWU4Q4ZiU0jtpoEhyZtLomxqxxWvGoBYsO/uBy4si3GN6ttnysyy7GHuHaVqVMkPNe 347USnyq0N/tloibyq3jwhKD9bfe5Sl8orwPpWrIm5LfGL/CQ8RAxZlUKYleMPsTAaLk oTL01nwO2PH0sJELkopqqa5pTHGAjYJtArnkHHhRQAzbqLceAPCCzcvpgiNX4XMzYilb j7lA== X-Gm-Message-State: AIkVDXKchmdw8AmCqkLkz+nwnEKhCWJX4VtfaNnq7FX4CUVHt3X2x+FEV+qLgQCNLQNQAw== X-Received: by 10.99.171.8 with SMTP id p8mr1511697pgf.165.1484073070664; Tue, 10 Jan 2017 10:31:10 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.36.152.2 with SMTP id n2ls3208770itd.7.canary-gmail; Tue, 10 Jan 2017 10:31:08 -0800 (PST) X-Received: by 10.107.129.39 with SMTP id c39mr4500211iod.57.1484073068734; Tue, 10 Jan 2017 10:31:08 -0800 (PST) Original-Received: from mail-io0-x241.google.com (mail-io0-x241.google.com. [2607:f8b0:4001:c06::241]) by mx.google.com with ESMTPS id s27si2705614ioi.18.2017.01.10.10.31.08 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 10 Jan 2017 10:31:08 -0800 (PST) Received-SPF: pass (google.com: domain of mwoehlke.floss@gmail.com designates 2607:f8b0:4001:c06::241 as permitted sender) client-ip=2607:f8b0:4001:c06::241; Original-Received: by mail-io0-x241.google.com with SMTP id 101so6962205iom.0 for ; Tue, 10 Jan 2017 10:31:08 -0800 (PST) X-Received: by 10.107.173.32 with SMTP id w32mr5225061ioe.136.1484073068368; Tue, 10 Jan 2017 10:31:08 -0800 (PST) Original-Received: from [192.168.1.173] (tripoint.kitware.com. [66.194.253.20]) by smtp.googlemail.com with ESMTPSA id i200sm8576660itb.0.2017.01.10.10.31.07 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 10 Jan 2017 10:31:07 -0800 (PST) In-Reply-To: X-Original-Sender: mwoehlke.floss@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com; spf=pass (google.com: domain of mwoehlke.floss@gmail.com designates 2607:f8b0:4001:c06::241 as permitted sender) smtp.mailfrom=mwoehlke.floss@gmail.com; dmarc=pass (p=NONE sp=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:30466 Archived-At: On 2017-01-10 12:01, Peter Koch Larsen wrote: > What do you do if you have an enum with some same_valued elements > (enum E { ea = 0, eb = 0})? My implementation forbids this. Why? E x = ea; assert(x == eb); // will succeed Such a prohibition makes some sense when converting an enum to a string (or to its ordinal), but there is no problem when converting an int to an enum (or a string to an enum, for that matter). -- 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. 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/5875286B.7040604%40gmail.com. .