220 38240 article Path: news.gmane.org!.POSTED!not-for-mail From: mihailnajdenov@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Simple, terse universal forwading for the next decade Date: Mon, 28 May 2018 10:07:16 -0700 (PDT) Lines: 469 Approved: news@gmane.org Message-ID: References: <80548757-8a42-499a-bf15-3670b2727082@isocpp.org> <8d3b34de-c06a-4083-bb0c-8e2c7482abf0@isocpp.org> <9930a9dc-b998-4431-a159-6d72d1d9b2ff@isocpp.org> <8e1c6607-a92d-496b-aad1-e992e049a748@isocpp.org> <2f782c2d-e89c-4d8b-8ef6-372c00e62ab1@isocpp.org> <93ee46a2-1469-48ae-b931-c060946f38d5@isocpp.org> <609892ba-f717-4458-b9e3-c5975378ad29@isocpp.org> <4d68237c-077a-4408-abf1-5f9670311f71@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_33120_1818343574.1527527236979" X-Trace: blaine.gmane.org 1527527115 20930 195.159.176.226 (28 May 2018 17:05:15 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 28 May 2018 17:05:15 +0000 (UTC) Cc: mihailnajdenov@gmail.com To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCUJ3A7GRAPRBRPOWDMAKGQEPTSLDKY@isocpp.org Mon May 28 19:05:11 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yb0-f200.google.com ([209.85.213.200]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fNLZz-0005HL-Jc for gclcip-std-proposals@m.gmane.org; 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Mon, 28 May 2018 10:07:18 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 2002:a25:c446:: with SMTP id u67-v6ls5459047ybf.10.gmail; Mon, 28 May 2018 10:07:17 -0700 (PDT) X-Received: by 2002:a25:c594:: with SMTP id v142-v6mr353951ybe.14.1527527237425; Mon, 28 May 2018 10:07:17 -0700 (PDT) In-Reply-To: X-Original-Sender: MihailNajdenov@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:38240 Archived-At: ------=_Part_33120_1818343574.1527527236979 Content-Type: multipart/alternative; boundary="----=_Part_33121_2001727964.1527527236980" ------=_Part_33121_2001727964.1527527236980 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Monday, May 28, 2018 at 7:29:12 PM UTC+3, Ga=C5=A1per A=C5=BEman wrote: > > What about =3D> as the forward operator? Was that considered? > >> >> I have no idea, I might write the author. I also have no idea if any=20 postfix was considered at all. In any case, all things considered, a postfix && is *very* good candidate= =20 in my book: auto f(QImage img) { return process(img&&.mirrored()); *//< QImage&& QImage::mirrored() &&=20 overload, D'OH* } Class::Class(string&& s, function&& f) : _s(s&&) *//< natural, language level syntax!* , _f(f&&) // {} auto cally =3D [](auto&&... args)=20 { return func(arg&&...);=20 }; template auto delay_invoke(F&& f, Args&&... args) { return [f=3Df&&, args =3D args&&...]() -> decltype(auto)=20 {=20 return std::invoke(f, args...); };=20 } && preserves the common established mental image for BOTH rval refs and frw= =20 refs. Making it posfix works *absolutely beautiful *with variadic expansion. It is the killer candidate.=20 --=20 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 e= mail 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/aa3b6d3b-78c9-447b-8052-143f6dc5b32c%40isocpp.or= g. ------=_Part_33121_2001727964.1527527236980 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Monday, May 28, 2018 at 7:29:12 PM UTC+3, Ga=C5= =A1per A=C5=BEman wrote:
What about =3D> as the forward operator? Was that considered?=


I have no idea, I m= ight write the author. I also have no idea if any postfix was considered at= all.


In any case, all things consi= dered, a postfix && is very good candidate in my book:
=

auto f(QImage img)
{
=C2=A0 return process(img= &&.mirrored()); //< QImage&& QImage::mirrored() && overload, D'OH<= /b>
}

Class::Class(string&& s, functi= on&& f)
=C2=A0: _s(s&&) //< natural, langua= ge level syntax!
=C2=A0, _f(f&&) //
{}=

auto cally =3D [](auto&&... args)= =C2=A0
{
=C2=A0 return func(arg&&...);=C2=A0
};<= /font>


template &l= t;class F, class... Args>
auto delay_invoke(F&& f, Args&&= amp;... args)
{
=C2=A0 return [f=3Df&&= amp;, args =3D args&&...]() -> decltype(auto)=C2=A0
= =C2=A0 {=C2=A0
=C2=A0 =C2=A0 return std::invoke(f, args...);
= =C2=A0 };
}

&& = preserves the common established mental image for BOTH rval refs and frw re= fs.

Making it posfix works absolutely beautiful= with variadic expansion.

It is the killer can= didate.=C2=A0

--
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