220 39848 article Path: news.gmane.org!.POSTED!not-for-mail From: Justin Bassett Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Named Parameters for C++ Date: Thu, 16 Aug 2018 21:04:34 -0700 Lines: 101 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="00000000000005b5e4057399a9dc" X-Trace: blaine.gmane.org 1534478563 9279 195.159.176.226 (17 Aug 2018 04:02:43 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 17 Aug 2018 04:02:43 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC5PL3NYWEDBBX4S3HNQKGQET2VUYAI@isocpp.org Fri Aug 17 06:02:39 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-oi0-f71.google.com ([209.85.218.71]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fqVyA-0002HN-1A for gclcip-std-proposals@m.gmane.org; Fri, 17 Aug 2018 06:02:38 +0200 Original-Received: by mail-oi0-f71.google.com with SMTP id j17-v6sf6086790oii.8 for ; 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[209.85.220.41]) by mx.google.com with SMTPS id r4-v6sor585462oia.225.2018.08.16.21.04.46 for (Google Transport Security); Thu, 16 Aug 2018 21:04:46 -0700 (PDT) Received-SPF: pass (google.com: domain of jbassett271@gmail.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; X-Received: by 2002:aca:f2c3:: with SMTP id q186-v6mr803323oih.193.1534478686466; Thu, 16 Aug 2018 21:04:46 -0700 (PDT) In-Reply-To: X-Original-Sender: jbassett271@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=aryPKnPU; spf=pass (google.com: domain of jbassett271@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=jbassett271@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:39848 Archived-At: --00000000000005b5e4057399a9dc Content-Type: text/plain; charset="UTF-8" On Thu, Aug 16, 2018 at 7:34 AM Matthew Woehlke wrote: > On 2018-08-16 07:53, David Brown wrote: > > I am at a loss to why people key wanting to make this such a complicated > > issue. > > [...] > > 2. The primary use is to check that parameters are given in the right > > order, with the ability to re-order parameters at the call site as a > > secondary concern. > > ...probably because plenty of people disagree with this point. AFAIAC, > any proposal that does NOT allow these: > > void foo(int, int :a = 1, int :b = 2, int :c = 12); > foo(3, b: 5); // foo(3, 1, 5, 12) > > void bar(int :a); > void bar(int :x); // distinct overload > > ...is pointless. Checking argument order is, IMHO, not only *not* "the > primary use", but *optional*. > I agree for the most part, but I disagree that this should be a valid overload set, unless parameters are name-only: void bar(int :a); void bar(int :x); The problem is that bar(4) is ambiguous. It would be better to catch this at the declaration rather than at the first ambiguous point of use. Overloading on name-only parameters is just fine. -- 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/CAPuuy5cqjR6C%3D--pD1fZQxHPQwU94dMLhTWD9MvkU6twszVhGg%40mail.gmail.com. --00000000000005b5e4057399a9dc Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

On Thu, Au= g 16, 2018 at 7:34 AM Matthew Woehlke <mwoehlke.floss@gmail.com> wrote:
On 2018-08-16 07:53, David Brown wrote:
> I am at a loss to why people key wanting to make this such a complicat= ed
> issue.
> [...]
> 2. The primary use is to check that parameters are given in the right<= br> > order, with the ability to re-order parameters at the call site as a > secondary concern.

....probably because plenty of people disagree with this point. AFAIAC,
any proposal that does NOT allow these:

=C2=A0 void foo(int, int :a =3D 1, int :b =3D 2, int :c =3D 12);
=C2=A0 foo(3, b: 5); // foo(3, 1, 5, 12)

=C2=A0 void bar(int :a);
=C2=A0 void bar(int :x); // distinct overload

....is pointless. Checking argument order is, IMHO, not only *not* "the=
primary use", but *optional*.

I ag= ree for the most part, but I disagree that this should be a valid overload = set, unless parameters are name-only:

void bar(int :a);
void bar(int :x);

The= problem is that bar(4) is ambig= uous. It would be better to catch this at the declaration rather than at th= e first ambiguous point of use. Overloading on name-only parameters is just= fine.
=C2=A0

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