220 33484 article Path: news.gmane.org!.POSTED!not-for-mail From: Zhihao Yuan Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: P0329R0 falls short for designated initialisers Date: Tue, 1 Aug 2017 00:36:07 -0500 Lines: 37 Approved: news@gmane.org Message-ID: References: <4892340.tBhI7hZKOg@tjmaciei-mobl1> <3975136.UunVSsvxqs@tjmaciei-mobl1> <17462887.APOcqOfj4b@tjmaciei-mobl1> 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 1501565773 20854 195.159.176.226 (1 Aug 2017 05:36:13 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 1 Aug 2017 05:36:13 +0000 (UTC) To: "std-proposals@isocpp.org" Original-X-From: std-proposals+bncBCSKRWMD4EHBBSVGQDGAKGQEYOYSTSA@isocpp.org Tue Aug 01 07:36:06 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-it0-f70.google.com ([209.85.214.70]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dcPqf-00050X-Gz for gclcip-std-proposals@m.gmane.org; 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[184.173.153.196]) by mx.google.com with UTF8SMTPS id m6si4214798qtc.403.2017.07.31.22.36.10 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 31 Jul 2017 22:36:10 -0700 (PDT) Received-SPF: pass (google.com: domain of bounce+3f9131.69110-std-proposals=isocpp.org@miator.net designates 184.173.153.196 as permitted sender) client-ip=184.173.153.196; Original-Sender: zy@miator.net X-Mailgun-Sending-Ip: 184.173.153.196 X-Mailgun-Sid: WyI3MTBkYiIsICJzdGQtcHJvcG9zYWxzQGlzb2NwcC5vcmciLCAiNjkxMTAiXQ== Original-Received: from mail-qk0-f179.google.com (mail-qk0-f179.google.com [209.85.220.179]) by mxa.mailgun.org with ESMTP id 59801349.7fae506a3bb0-smtp-out-n02; Tue, 01 Aug 2017 05:36:09 -0000 (UTC) Original-Received: by mail-qk0-f179.google.com with SMTP id d145so3402546qkc.2 for ; Mon, 31 Jul 2017 22:36:09 -0700 (PDT) X-Received: by 10.55.150.133 with SMTP id y127mr2823841qkd.200.1501565768545; Mon, 31 Jul 2017 22:36:08 -0700 (PDT) Original-Received: by 10.200.54.164 with HTTP; Mon, 31 Jul 2017 22:36:07 -0700 (PDT) In-Reply-To: <17462887.APOcqOfj4b@tjmaciei-mobl1> X-Gmail-Original-Message-ID: X-Original-Sender: zy@miator.net X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@miator.net header.b=BOL7IYCN; spf=pass (google.com: domain of bounce+3f9131.69110-std-proposals=isocpp.org@miator.net designates 184.173.153.196 as permitted sender) smtp.mailfrom=bounce+3f9131.69110-std-proposals=isocpp.org@miator.net 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:33484 Archived-At: On Tue, Aug 1, 2017 at 12:15 AM, Thiago Macieira wrote: > > C++ developers usually add constructors. > That will be too ideal. There is a difference between you break intentionally, and you break without knowing... >> struct X { Agg a; }; >> X c { { .a{ .y = 5, .x = 5 } }; // no >> X c { { .a = { .y = 5, .x = 5 } }; // ok > > How about: > > X = { .a.x = 5, .a.y = 5 }; // ok or not? > I think yes. But my idea seems lacking support. One of the co-authors does not consider this subtle difference to be teachable. The last time we discriminated = {} from {} to support "C-only" rules was in C++11, to limit brace elision, but later we just enabled it to {} as well :( -- Zhihao Yuan, ID lichray The best way to predict the future is to invent it. _______________________________________________ -- 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/CAGsORuDRLjCsa%2BW5A7AA7YGe%2BGXoOYDfkdsjkjo%2Bx5MwTNhdYg%40mail.gmail.com. .