220 39877 <2755b639-002d-a94b-a3d4-3a0197259cda@gmail.com> article Path: news.gmane.org!.POSTED!not-for-mail From: Matthew Woehlke Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Named Parameters for C++ Date: Fri, 17 Aug 2018 13:53:11 -0400 Lines: 82 Approved: news@gmane.org Message-ID: <2755b639-002d-a94b-a3d4-3a0197259cda@gmail.com> References: <823c098a-0fb0-18c3-82f3-e8a8616312f1@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 1534528270 24731 195.159.176.226 (17 Aug 2018 17:51:10 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 17 Aug 2018 17:51:10 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 To: std-proposals@isocpp.org, David Brown Original-X-From: std-proposals+bncBC37LBFWUIFBBCMX3TNQKGQE474T5NY@isocpp.org Fri Aug 17 19:51:05 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qt0-f199.google.com ([209.85.216.199]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fqitt-0006Gw-0O for gclcip-std-proposals@m.gmane.org; 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[66.194.253.20]) by smtp.googlemail.com with ESMTPSA id 134-v6sm1459638qke.94.2018.08.17.10.53.11 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 17 Aug 2018 10:53:11 -0700 (PDT) Openpgp: preference=signencrypt In-Reply-To: Content-Language: en-US X-Original-Sender: mwoehlke.floss@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=X+2+q6+4; spf=pass (google.com: domain of mwoehlke.floss@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=mwoehlke.floss@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org 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:39877 Archived-At: On 2018-08-17 13:12, David Brown wrote: > On 17/08/18 17:16, Matthew Woehlke wrote: >> On 2018-08-17 06:14, David Brown wrote: >>> On 16/08/18 15:08, mihailnajdenov@gmail.com wrote: >>>> First - you make something, that has been private for 30+ years, public. >>> >>> No, it is not. The names for parameters are in function declarations, >>> in headers - these are public. >> >> No, they aren't. Or, more correctly, while they are "public" in the >> sense that a user can see them by reading the header, they aren't a >> (normative) part of the API, any more than comments are. To *the >> compiler*, they may as well not exist. >> >> You are proposing to change that. That is a *serious* change. > > Nah, you are overreacting. You are certainly entitled to believe that. I happen to disagree, but more importantly, AFAICT quite a few others also disagree. The point is, you are facing an uphill battle to convince the committee on this matter. Right now, changing the names of function parameters is SC+BC. IIUC, you are proposing to make it at least SIC, if not also BIC. I honestly can't see how you're going to convince the committee that that's okay. > At most, it is a /tiny/ issue compared to > the huge amount of implementation stuff in typical C++ headers that > really is supposed to be private implementation details. (Hint: lots of > it is labelled "private:".) You mean like this? class foo { ...interface... private: FooPrivate* d; }; No so much "leaked" there... > Some people have suggested a syntax for function declarations (or > definitions) that indicated that one or more of the parameters /must/ be > used as named parameters. I can see that being useful if they are to be > used for overloads, but not otherwise. Well, I don't believe I've ever been one of them. I currently don't see any reason why such a feature would be desirable. There *are* instances (overload resolution, skipping parameters) when a *call* needs to use a name, but I don't see the value in having a declaration that says you *must always* use the name. >>> and the whole idea would be useless if >>> special syntax were needed to declare that a function uses named parameters. >> >> I don't think you can *avoid* that, since there is very strong >> opposition (see above) to turning all existing functions into functions >> that have named parameters. Also, everyone that *is* proposing to have >> named parameters with syntax apparently don't share this opinion. > > I don't think your argument against allowing people to use named > parameters for existing functions is at all convincing. Who's arguing that? I would make this perfectly legal: void foo(int x); // note: not a named parameter foo(.x=5); // okay, but maybe warn in pedantic mode foo(.a=5); // okay, but probably warn -- 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/2755b639-002d-a94b-a3d4-3a0197259cda%40gmail.com. .