220 38241 article Path: news.gmane.org!.POSTED!not-for-mail From: Arthur Tchaikovsky Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Simple, terse universal forwading for the next decade Date: Mon, 28 May 2018 19:09:47 +0200 Lines: 300 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/alternative; boundary="000000000000593a3b056d472f32" X-Trace: blaine.gmane.org 1527527262 30456 195.159.176.226 (28 May 2018 17:07:42 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 28 May 2018 17:07:42 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDL6FI4NYYERBXHPWDMAKGQEJOYUVHA@isocpp.org Mon May 28 19:07:38 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qk0-f198.google.com ([209.85.220.198]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fNLcQ-0007qX-JI for gclcip-std-proposals@m.gmane.org; Mon, 28 May 2018 19:07:38 +0200 Original-Received: by mail-qk0-f198.google.com with SMTP id p85-v6sf2113011qke.23 for ; Mon, 28 May 2018 10:09:50 -0700 (PDT) ARC-Seal: i=2; a=rsa-sha256; t=1527527389; cv=pass; d=google.com; s=arc-20160816; b=eUMgRuCjQrESYDklJ0G16v0WeZK2c4mKQJ8WOPwNTAraXROCXJUtZxe7ApQtvudTFl jrhtXH+ST+DWb0qtn+ywXDNSFNCHsYM8cU02GCFGXWwu72Urc4Y/itqXM+XFgUNiGqWK OzyL5PMKnDMbNwUaJ49j5DbwmnS6TvPDoh02dNbJil+liYvRBnVvVOT6wg8q1lgSVvSB eOJA5a8ZuZBhIjcgU8XhYJUA2sdsN6zkg0IUQzvBXQMFuYmbOtzGq66qkBlK/jc32V+s 9PeocgvrKmDQVv5VMmrnpVZWfedQSibD7NzOkYilfWRXwNvSIHhHq1Ml4jf1MhUdkHoo 4jLg== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-unsubscribe:list-subscribe:list-archive:list-help:list-post :list-id:mailing-list:precedence:reply-to:to:subject:message-id:date :from:references:in-reply-to:mime-version:arc-authentication-results :arc-message-signature:dkim-signature:arc-authentication-results; bh=qYtjhgdj8K0ouFJWPb9A/ra5CmA0Wlg8/Hd1K8zxqxI=; b=Qh25FO78Rg9IAJ7Kkd5Q35dJej0u+SiM2G3sb6JexQ8TBhsvePCKqG6vb+QSzO5NDb bvYw+f/Rq0yLqwnb6TAf0HTs5dcLQ5AwRIpWJKfVYuSBuRBcmnoN5YmFjHHHewDx+aZj 9aKntN171AbWxp1rV424T/RBUzEN6mOy8nNr/PRYGGaaFVaFoQIScE041EIAFpe2rj2H C5T1ACvSLVP87l+6cABMXD32E2eRGsv/BBnvmOhSrdrWTW37oHk+o/2PR6moFOKJrgKn 4enZkNaHu3L7700DDbaceCKlQ9dPrHTWeixl1+DfSKODE5qqZQ/IRvimF4w/Tay8Ro6a /PQQ== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=Ncyf8Uoj; spf=pass (google.com: domain of atch.cpp@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=atch.cpp@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=qYtjhgdj8K0ouFJWPb9A/ra5CmA0Wlg8/Hd1K8zxqxI=; b=Be/BUizminGuM9/7t9K3H9U0hzjnKnUUX+LPHoaC2oC/TbJR8bIO55BsuWF9tXo0cK LiiqxreWeqwWONm+Ac9DhHlLu88pb08wbepaYNkaX3c+mbujS4RmYss6bvURxAGhUF3D 9l3VBgA3jslx8TgKraXzNHOb2/m7JOQwdIzLdweEIuOCbdGJwQsFbonpWibrveC0tLst SudpaGmpn7j7o06vKaR8r84n0KO/iscW8ME2y+c25uC9lhAi8J3eRC1EdXbE7liCa3jh DfUK8+CgPMpCCzh9AXFHmFpLlxVVgrsvBFiXcY2S1SjC7T0d71BthpVUzuv4MiNCicF2 qOGQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:x-original-sender :x-original-authentication-results:reply-to:precedence:mailing-list :list-id:x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=qYtjhgdj8K0ouFJWPb9A/ra5CmA0Wlg8/Hd1K8zxqxI=; b=GcPzNq1zA0CP8S5P2SHPhcDiCoJvx42QH3WNo96na1vOYcj6rMVtMLeF2YXxZfYxlN oZzNbLdyOICAAFOWYkXskLKnTOnmEMa6kDW5WYPN9nKxqqZ0Sc8Lp99rjhjKqCZkK0pO ewTfFyK1hsXxs6KPS+ew5ISSpSOUUc8+XH9rgkgWaF/DfkpOr4tux+j49axy4qfAr8Jy dRHaDIYv7HkfU8zrfHj7juSzaoLl4ZE4cwe+EMqp3Rh5RspTbzmt8naTZeF0z32JFEDh ZMSya5CNjsfHTzF824T/9xSdymod07OeMSu/D32xq0aSNoAk9oxWf3Gk/zJ/YNk3LCCl 0s+Q== X-Gm-Message-State: ALKqPwfILQfeObZBuxjydj5X1l64ueLhkKX+Mcih2POp9NWfdJaEnq1m ytUEWMPKGztPOXRv/teOpvB3ag== X-Google-Smtp-Source: ADUXVKLU+A4d4KjahmeLnJwXWTvaQIZzo8J4t1N5hzSKq3qfy9eUUqsKIXRdmnknzjw1Y/kAqZCTPw== X-Received: by 2002:a0c:c590:: with SMTP id a16-v6mr7701198qvj.43.1527527389573; Mon, 28 May 2018 10:09:49 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 2002:a0c:96a4:: with SMTP id a33-v6ls13114796qvd.1.gmail; Mon, 28 May 2018 10:09:48 -0700 (PDT) X-Received: by 2002:a0c:e7cd:: with SMTP id c13-v6mr12866459qvo.35.1527527388652; Mon, 28 May 2018 10:09:48 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1527527388; cv=none; d=google.com; s=arc-20160816; b=AR+NMK7kbhtOqm2akSC+ymbRMD5i7ld6HAod4KswjVuHXvnPcOZ/te1XgihDwgW4bY pM/+KY4hGA46Astsp+aV58+THJQbJwK1MeILG22+0qtuAeSlFCyumFzBT+aI33iDK30U Nwoy2DSqZeBoNogOpPMUW9ObUeh38fm8+kYjxoR+2xF7lDnv7QM426ifAQgVc21YF2Rk BAO6YwhMt5ssDOxUQRjpAETHCoShsPpl98vj/XJgjtaDmYFHqifg6b115AAeZmRcNcTe 6p5Be4Xod4Ts0eqcsvPWmaObkGc7YALWJyy1EQ7JEkJcTjWSbaAJX47KV5o9M2FpLlpl Gsmg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=to:subject:message-id:date:from:references:in-reply-to:mime-version :dkim-signature:arc-authentication-results; bh=buECONO0rGBDqMEGPSgivBdaCzdWdDr+sy7nwFa4wFs=; b=Q/WtRJJZBOGowLFHGz99FFpP9kR2FJX73eEsr9QDrGl2ValhLr7DiFOQMhcrSLlZqu /y5rcB1ERwO6RWpW4W3P3iJtf4Was/QTH072x3AeFj9hd+IQWa14YII4stT8qUQ9nj9v SaFNffCQfm3Yc7SR96x6LdOCwcrQHZ9u+vwGg3jSrDcHaItbhSypYsvEP2qIAs27ebOo Z7NzPdDFoRQuxlPWjzg+Ci7V0PIHetflFvUErwSaN/X9OxA1zBlPIKftMjcMg8DqmT/D lmU6AdEr6aZ5oFZeOmwAcK3LnBRXyidZuP7hZrQr3PxdqmFPEotNdmR0JEnGcz8h8FZF OEgw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=Ncyf8Uoj; spf=pass (google.com: domain of atch.cpp@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=atch.cpp@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Original-Received: from mail-sor-f41.google.com (mail-sor-f41.google.com. [209.85.220.41]) by mx.google.com with SMTPS id g17-v6sor3672604qvm.77.2018.05.28.10.09.48 for (Google Transport Security); Mon, 28 May 2018 10:09:48 -0700 (PDT) Received-SPF: pass (google.com: domain of atch.cpp@gmail.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; X-Received: by 2002:a0c:bd04:: with SMTP id m4-v6mr13027132qvg.140.1527527388034; Mon, 28 May 2018 10:09:48 -0700 (PDT) Original-Received: by 2002:ac8:35cf:0:0:0:0:0 with HTTP; Mon, 28 May 2018 10:09:47 -0700 (PDT) In-Reply-To: X-Original-Sender: atch.cpp@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=Ncyf8Uoj; spf=pass (google.com: domain of atch.cpp@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=atch.cpp@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:38241 Archived-At: --000000000000593a3b056d472f32 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I really hope it '&&' will make it! On Mon, May 28, 2018 at 7:07 PM, wrote: > > > 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 > postfix was considered at all. > > > In any case, all things considered, a postfix && is *very* good candidate > in my book: > > auto f(QImage img) > { > return process(img&&.mirrored()); *//< QImage&& QImage::mirrored() && > overload, D'OH* > } > > Class::Class(string&& s, function&& f) > : _s(s&&) *//< natural, language level syntax!* > , _f(f&&) // > {} > > auto cally =3D [](auto&&... args) > { > return func(arg&&...); > }; > > > template > auto delay_invoke(F&& f, Args&&... args) > { > return [f=3Df&&, args =3D args&&...]() -> decltype(auto) > { > return std::invoke(f, args...); > }; > } > > > && preserves the common established mental image for BOTH rval refs and > frw refs. > > Making it posfix works *absolutely beautiful *with variadic expansion. > > It is the killer candidate. > > -- > 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/aa3b6d3b-78c9-447b- > 8052-143f6dc5b32c%40isocpp.org > > . > --=20 Yours sincerely Artur Czajkowski --=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/CANPOWsdk%2BX4Ydb4acYW9b9iy1nUOKxNLqhZBk%2BJeCnJ= yeetB5w%40mail.gmail.com. --000000000000593a3b056d472f32 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I really hope it '&&' will make it!
<= div class=3D"gmail_extra">
On Mon, May 28, 20= 18 at 7:07 PM, <mihailnajdenov@gmail.com> wrote:
=


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

I have no idea, I might write the author. I also have n= o idea if any postfix was considered at all.


<= /div>
In any case, all things considered, a postfix && is ve= ry good candidate in my book:

auto f(QImage img)
{
=C2=A0 return process(img&&.mi= rrored()); //< QImage&& QImage::mirrored() && overload, D'O= H
}=

Class::Class(str= ing&& s, function&& f)
=C2=A0: _s(s&&) //< natural, l= anguage level syntax!
=C2=A0, _f(f&&) //
{}

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


template <c= lass F, class... Args>
auto delay_invoke(F&& f, Args&&= ;... args)
{
=C2=A0 return [f=3Df&&, args =3D args&am= p;&...]() -> 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 r= val refs and frw refs.

Making it posfix works a= bsolutely beautiful with variadic expansion.

I= t is the killer candidate.=C2=A0

--
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-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/aa3b= 6d3b-78c9-447b-8052-143f6dc5b32c%40isocpp.org.



--
Yours sincerely
Artur Czajkow= ski

--
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/CANPOWsdk%2BX= 4Ydb4acYW9b9iy1nUOKxNLqhZBk%2BJeCnJyeetB5w%40mail.gmail.com.
--000000000000593a3b056d472f32-- .