220 32547 article Path: news.gmane.org!.POSTED!not-for-mail From: Nicol Bolas Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: constexpr ternary (was: Re: relaxing rules for ternary operator. Allow incompatible types.) Date: Sun, 21 May 2017 06:59:43 -0700 (PDT) Lines: 65 Approved: news@gmane.org Message-ID: References: <1b5ee8eb-53df-4e98-af2f-829c7bc2e5b2@isocpp.org> <9770742d-c5de-4a55-869f-ab71231cc775@isocpp.org> <9dbebffff1732ae5966a93b69a836757@kdab.com> <72a1eb41-3713-4602-84c0-e3fce2cadbd4@isocpp.org> <4752662e-21d2-4498-b236-a5dfb7cb2520@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_2262_880569485.1495375183748" X-Trace: blaine.gmane.org 1495375186 30486 195.159.176.226 (21 May 2017 13:59:46 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 21 May 2017 13:59:46 +0000 (UTC) Cc: zy@miator.net To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCEKFTV6ZUMBBUF2Q3EQKGQELDZIG2Y@isocpp.org Sun May 21 15:59:41 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-oi0-f69.google.com ([209.85.218.69]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dCROV-0007lI-OE for gclcip-std-proposals@m.gmane.org; Sun, 21 May 2017 15:59:39 +0200 Original-Received: by mail-oi0-f69.google.com with SMTP id w138sf137110578oiw.0 for ; Sun, 21 May 2017 06:59:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc: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=wv/LC3c5D0xVjfP36jC2voPia/i7WbcBcNDXdzOJ0Dg=; b=d99qiY1d1+GIOE2kr3eV6ezlfwgCHXBBbvDyJ7Z/g4VfgFMHLgUwnuSqPTFIsNgPKK HlObMfl6IXKl/oPv5fKVH07J4n7ln9cP2V5waRLboSmFcA/KYT8ccfpspO6LqKPO/1QZ +poiS/8Xoc5DMGbTGQhkDmJqVLAM7A3OCpdi23wwpv64hMExIixz/3GfXjqsx3z8IhC8 HkIoOEAcv81ir8Vy4rMSEiKtExhjvXhq6LG33SifWIR1jaI1WJP/Qq/aiqR7ucIAgW8G i2vgjljtnuWHg1wMO2VA83AV+73XGts7VZ7I5LQzaNbTKLhRktaAoCzbrQ4kFIy86Av6 vTQQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc: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=wv/LC3c5D0xVjfP36jC2voPia/i7WbcBcNDXdzOJ0Dg=; b=IGumeNAI42I/2YoYK6Tt2bES0Mi5+CJ8TzjBMcnVSJ4gT031XOJZ9PEBuSSAs1jwSh zck0EUxuCfIPfBZGJF8uCpPcX4Yyo06hTyvBeOWKlX7G6iGU43Q7nw1wxVR+9N0nNT5o gvXnCHaE9ZrVLCXw0rAO/qWyZqq/vtndUj4EPcIimSTXt8Wmfg4Z4sIVTbk3+QBD1WTZ hrZlp/TTXdk4eqoEsHRV+5SHWmjfDmkskRfHn0HtnhHl6zM9wfx6T7OiWgRzHrm0gWzW wfLhploeDysF53SyWnzhefkinyF4FYc/Rw0IGIGUrpmVj5XY0gzEkg4YklR1PhPBTn0k LfQg== 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:cc: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=wv/LC3c5D0xVjfP36jC2voPia/i7WbcBcNDXdzOJ0Dg=; b=N4FGoimJOYaBW0rBbLtQpCN5mgoPjsFQpGdDutpE7bt55FYusGRgCinUt9fmnCRUs+ c3wKPnjvw/yUoca+AUsJug6jRMKvOCrLnFbHibhuYkSFLhiUbFtM0jJ1dpyVafMg8Drp sTi2xLU+9GGRsW2oNoSnw3lk/WQYFY8v2X0hnl4/UfZwi3a9eI3ju5/E4OJIbUDdU1x/ v/vvpQ1sYLIbzxCP2I9DTPp+pJThe51xAsU4EzJPHpyBCXb3j0B4tjwlubh6vpyD2XRP lwJ78IawqYlLs0BWXCAoyeUUnfpOSsa0nfdiUNCSyDzH944nDSH6u5k4DoPCLzyJYvb4 rCDQ== X-Gm-Message-State: AODbwcBHByrul37ULd7A9M+Gq2NhQXBaUWMUknUX8/b9BROxDenh5XJX Z6xuHW78TUrPunqY X-Received: by 10.157.51.36 with SMTP id f33mr9332214otc.14.1495375184964; Sun, 21 May 2017 06:59:44 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.82.29 with SMTP id e29ls1993688oth.7.gmail; Sun, 21 May 2017 06:59:44 -0700 (PDT) X-Received: by 10.157.33.109 with SMTP id l42mr388753otd.7.1495375184246; Sun, 21 May 2017 06:59:44 -0700 (PDT) In-Reply-To: <4752662e-21d2-4498-b236-a5dfb7cb2520@isocpp.org> X-Original-Sender: jmckesson@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:32547 Archived-At: ------=_Part_2262_880569485.1495375183748 Content-Type: multipart/alternative; boundary="----=_Part_2263_1401191829.1495375183748" ------=_Part_2263_1401191829.1495375183748 Content-Type: text/plain; charset="UTF-8" On Saturday, May 20, 2017 at 10:54:38 PM UTC-4, Mingxin Wang wrote: > > If the condition is not "constexpr", and the types are determined at > runtime, the "proxies" and the "wrappers" can be used to solve this > problem. ( > https://groups.google.com/a/isocpp.org/forum/#!topic/std-proposals/kvkgsHM6wFQ > ) > So long as you're willing to suffer through needless virtual call overhead, as well as less obvious code, yes. -- 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/f392812b-7d49-4074-9710-93f9fc4262d3%40isocpp.org. ------=_Part_2263_1401191829.1495375183748 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Saturday, May 20, 2017 at 10:54:38 PM UTC-4, Mingxin Wa= ng wrote:
If the condition is not "constexpr",=C2=A0=C2=A0and t= he types are determined at runtime, the "proxies" and the "w= rappers" can be used to solve this problem. (https://groups.goo= gle.com/a/isocpp.org/forum/#!topic/std-proposals/kvkgsHM6wFQ)=

So long as you're willing to suffer t= hrough needless virtual call overhead, as well as less obvious code, yes.

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