220 41135 article Path: news.gmane.org!.POSTED!not-for-mail From: Bengt Gustafsson Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Function Parameter of Struct Type -> Named Parameters Date: Thu, 29 Nov 2018 13:29:15 -0800 (PST) Lines: 113 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/mixed; boundary="----=_Part_2944_682202211.1543526955762" X-Trace: blaine.gmane.org 1543526838 15420 195.159.176.226 (29 Nov 2018 21:27:18 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 29 Nov 2018 21:27:18 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCRIRSPDTQIRBLFUQHQAKGQEGASKJUA@isocpp.org Thu Nov 29 22:27:14 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yw1-f69.google.com ([209.85.161.69]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gSTq4-0003nO-Lc for gclcip-std-proposals@m.gmane.org; Thu, 29 Nov 2018 22:27:12 +0100 Original-Received: by mail-yw1-f69.google.com with SMTP id 21-v6sf2323195ywd.13 for ; Thu, 29 Nov 2018 13:29:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:message-id:in-reply-to:references:subject:mime-version :x-original-sender:reply-to:precedence:mailing-list:list-id :list-post:list-help:list-archive:list-subscribe:list-unsubscribe; bh=+2r6mfla3KkDss1eM+vh3idfB0lOhmamIhj/SfHoCR4=; b=XkGFUPp0XEjUVehktn46MjlasbHJu7aV+/L9T7putzUFkDniUSUrqyILD0e86Kt7pA dN514iK8iR7s016f9/Lmo5yV+DvUAMIjxqUIHG4vPeOTJ9n6cC/Fv1scjF2+52f3sZgL x9tSMqztCAU5cuGasIZJlpLFv49tPuUm9SJm2iQ0xNSjRI729dOlTdfc9heX6O/q1xvQ dvmqD/dvli/1TZTVnqc0SE4Js7ScAZGRLs5DI+3vt/ShQ726sxqG7UN225uQq2VL0g/s fdS8ev6HKzGcZ08aAhdIxXXQWC2CTPhAplFIVV2xg9XmPg0yQhOICTErRTB/fNax9ZkD Mjsg== 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: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=+2r6mfla3KkDss1eM+vh3idfB0lOhmamIhj/SfHoCR4=; b=O/KJqRnkUnTMfEuumYLP3BZvuXmoZAlEQDggegYhA02c+HL18eT9DmjcCWsuCdllfA n1t2r4BJVWLzaxjLMc0OKtKiwymNDd8B6LkorlxV+qmlQYUsWY2g8+cZV2lT8/Ze9G/S gBwSutEvpPfed87Tu9csg8Pd2EkZkW+H2pMZT+N0IrjfE9YsCLwTJlgj1oY9OBxqNrFh ivwwUH7uK9frXnmq91/EWQmA2Dq17r58EE/ZQeRmyJKit3eFZDAL52xLKHTCRFqPrm6D BGoIkK2l+8E2ZYQ8yd3wHGXW4MjbmCiE4MzaJ4s7UvYeHzPV6gB1ZLTK9b4ExoGGFCcf ENCg== X-Gm-Message-State: AA+aEWYMWS2NPJdN0mzc5D1rIlvLiQuDb3mAjI6cLNrWffmpvp5SDfwn RnoHaNXDkHNtq9gcquHqoiVzEw== X-Google-Smtp-Source: AFSGD/UbaQZ31I8bkfuBgak5lAVdyUt3xH4YAGLU/hZJKpUsz1B2KMPdYQHJEretIlpRX2HSh0+gcQ== X-Received: by 2002:a25:9cc8:: with SMTP id z8-v6mr1771254ybo.97.1543526957780; Thu, 29 Nov 2018 13:29:17 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 2002:a81:3084:: with SMTP id w126ls1807936yww.4.gmail; Thu, 29 Nov 2018 13:29:16 -0800 (PST) X-Received: by 2002:a81:528b:: with SMTP id g133mr36876ywb.1.1543526956378; Thu, 29 Nov 2018 13:29:16 -0800 (PST) In-Reply-To: X-Original-Sender: bengt.gustafsson@beamways.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:41135 Archived-At: ------=_Part_2944_682202211.1543526955762 Content-Type: multipart/alternative; boundary="----=_Part_2945_2001995475.1543526955762" ------=_Part_2945_2001995475.1543526955762 Content-Type: text/plain; charset="UTF-8" And it also misses the possibility to call different function overloads depending on the names provided at the call site. Den torsdag 29 november 2018 kl. 16:57:21 UTC+1 skrev Ville Voutilainen: > > On Thu, 29 Nov 2018 at 17:50, Hyman Rosen > wrote: > > > > On Wed, Nov 28, 2018 at 11:58 PM Andrew Tomazos > wrote: > >> > >> It seems to me that a function that takes a struct combined with C++20 > >> > >> designated initializers gets us very close to named parameters > >> This also seems easy to implement. > >> Thoughts? Worth pursuing? > > > > > > I think named argument association should be sui generis, not > implemented > > by weird class equivalents. Doing the latter hearkens back to the days > of OO, > > where everything was defined in terms of virtual functions. We should > define > > the behavior we want, not try for an equivalence that may or may not > have dark > > corners that don't quite match. > > I don't see how an automatic struct wrapper is necessarily a good > solution to the problem, since it changes the arity > of the function. This has practical consequences; the function is no > longer callable with separate unnamed > arguments, which is a horrible loss of functionality. > -- 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/d2bedde3-3b25-454d-acdd-96392d886343%40isocpp.org. ------=_Part_2945_2001995475.1543526955762 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
And it also misses the possibility to call different funct= ion overloads depending on the names provided at the call site.

Den = torsdag 29 november 2018 kl. 16:57:21 UTC+1 skrev Ville Voutilainen:On Thu, 29 Nov 2018 at 17:50, Hyman R= osen <hyman...@gmail.com> wrote:
>
> On Wed, Nov 28, 2018 at 11:58 PM Andrew Tomazos <andrew...@gmail.com= > wrote:
>>
>> It seems to me that a function that takes a struct combined wi= th C++20
>>
>> designated initializers gets us very close to named parameters
>> This also seems easy to implement.
>> Thoughts? =C2=A0Worth pursuing?
>
>
> I think named argument association should be sui generis, not impl= emented
> by weird class equivalents. =C2=A0Doing the latter hearkens back t= o the days of OO,
> where everything was defined in terms of virtual functions. =C2=A0= We should define
> the behavior we want, not try for an equivalence that may or may n= ot have dark
> corners that don't quite match.

I don't see how an automatic struct wrapper is necessarily a good
solution to the problem, since it changes the arity
of the function. This has practical consequences; the function is no
longer callable with separate unnamed
arguments, which is a horrible loss of functionality.

--
You received this message because you are subscribed to the Google Groups &= quot;ISO C++ Standard - Future Proposals" group.
To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposa= ls+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/d2bedde3-3b25-454d-acdd-96392d886343= %40isocpp.org.
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