220 41497 article Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Dejan Milosavljevic Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Anybody interested in reviewing draft/presenting "anti" spaceship paper? 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[209.85.220.65]) by mx.google.com with SMTPS id l17sor5797120wrt.6.2019.02.25.03.18.22 for (Google Transport Security); Mon, 25 Feb 2019 03:18:22 -0800 (PST) Received-SPF: pass (google.com: domain of dmilos@gmail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; X-Received: by 2002:adf:dd8a:: with SMTP id x10mr12805532wrl.117.1551093501880; Mon, 25 Feb 2019 03:18:21 -0800 (PST) In-Reply-To: X-Original-Sender: dmilos@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=dN8zaahU; spf=pass (google.com: domain of dmilos@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=dmilos@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-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:41497 Archived-At: --000000000000316c0b0582b61906 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Agree to have three-way operator. Disagree that this operator should be consisted of <=3D>. Tilde might good candidate or double tilde. Hmm scratch that heavy collide with bit not. Probably I miss something. What is literal name of this operator? From my experience 'hello world' should be switch( a spaceship b) { case(1): std::cout << "greater\n"; break; case(0): std::cout << "equal\n"; break; case(-1): std::cout << "lesser\n"; break; } On Tue, Feb 19, 2019 at 12:34 AM Vishal Oza wrote: > Thank you I have a simple uses case but this is more like a hello world > and not a production ready example I would like more examples to refine m= y > understanding > > #include > #include > int main() > { > auto a =3D 75; > auto b =3D 175; > if (auto comp =3D a <=3D> b; comp > 0) > std::cout << "greater\n"; > else if (comp =3D=3D 0) > std::cout << "equal\n"; > else > std::cout << "lesser\n"; > } > > > > On Monday, February 18, 2019 at 5:22:12 PM UTC-6, Ga=C5=A1per A=C5=BEman = wrote: >> >> It's on my to-do list - but as a rough tldr: use <=3D> to implement all = the >> ordering operators, but use < in calling it. >> >> On Mon, Feb 18, 2019, 23:11 Vishal Oza > >>> I think that the spaceship operator <=3D> feature needs more informatio= n >>> on how it should be used for common programmer. I do not think that the >>> spaceship operator <=3D> should be used removed from the standard. I wo= uld >>> like some more books and articles on how to use this feature both as a >>> run-time feature and a compile-time feature. >>> >>> On Saturday, February 16, 2019 at 3:43:01 PM UTC-6, libb...@gmail.com >>> wrote: >>>> >>>> Hi everybody, >>>> >>>> I do not participate in C++ standardization, but I dislike <=3D> so mu= ch >>>> that I am considering writing an proposal to stop it. >>>> I know it is futile to try to revert feature this big this late in >>>> C++20 cycle, it is mostly about doing the right thing=E2=84=A2 even wh= en you >>>> have zero chance of success. :) >>>> >>>> Draft is here >>>> >>>> . >>>> >>>> Feel free to comment objections, requests for clarification... in the >>>> document or reply here. >>>> Also since I do not attend C++ standardization meetings if somebody >>>> likes the draft and is interested in presenting it that would also be = great. >>>> >>>> regards, >>>> Ivan >>>> >>> -- >>> 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-proposal...@isocpp.org. >>> To post to this group, send email to std-pr...@isocpp.org. >>> To view this discussion on the web visit >>> https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/c4244615-6= 097-4d4c-a87a-4b435911b8a5%40isocpp.org >>> >>> . >>> >> -- > 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/f699812c-8fc= 6-4080-9eaa-0ff339fc2917%40isocpp.org > > . > --=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/CAEfefmyLGpro2-yAcrdUZjeO4PmtQUAwrHSp1dHSrcWewmi= %3DJg%40mail.gmail.com. --000000000000316c0b0582b61906 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Agree to = have three-way=C2=A0operator.
Disagree that this operator should = be consisted of <=3D>.
Tilde might=C2=A0good candidate or d= ouble tilde. Hmm scratch that heavy collide with bit not.

Probably I miss something.
What is literal name of this = operator?

From my experience=C2=A0 'hello worl= d' should be=C2=A0

swi= tch( a=C2=A0spaceship b)
{
=C2=A0=C2=A0 ca= se(1): std::cout << "greater\n"; break;
=C2=A0=C2=A0=C2=A0case(0): std::cout << "equal\n"= ;; break;
= =C2=A0=C2=A0=C2=A0case(-1): std::cout= << "lesser\n"; break;=
}


On Tue, Feb 19, 2019 at 12:34 AM Vishal Oza= <vickoza@gmail.com> wrote:<= br>
Thank you I have a simple uses c= ase but this is more like a hello world and not a production ready example = I would like more examples to refine my understanding

#include = <iostream>
#include <compare&= gt;
int main()
{
=C2=A0 =C2=A0 auto a =3D 75;<= span class=3D"gmail-m_-8525493098135418246styled-by-prettify" style=3D"colo= r:rgb(0,0,0)">
=C2=A0 =C2=A0 auto b =3D 175;
=C2=A0= =C2=A0 if (auto comp =3D a <= =3D> b; comp > 0)
=C2=A0= =C2=A0 =C2=A0 =C2=A0 std::= cout << "greater\n";
=C2=A0 =C2=A0 else<= /span> if (comp =3D=3D 0)
=C2=A0 =C2=A0 =C2=A0 =C2=A0 std<= span class=3D"gmail-m_-8525493098135418246styled-by-prettify" style=3D"colo= r:rgb(102,102,0)">::cout &l= t;< "equal\n";
=C2=A0 =C2=A0 else
=C2=A0 =C2=A0 =C2=A0 =C2=A0 std<= /span>::cout << "lesser= \n";
}


On Monday, February 18, 2019 at 5:22:12 PM UTC-6, Ga=C5=A1per A=C5=BEman = wrote:
It's on my to-do list - but as= a rough tldr: use <=3D> to implement all the ordering operators, but= use < in calling it.

On Mon, Feb 18, 2019, 23:11 Vishal Oza <vic...@gm= ail.com wrote:
I think that = the spaceship operator <=3D> feature needs more information on how it= should be used for common programmer. I do not think that the spaceship op= erator <=3D> should be used removed from the standard. I would like s= ome more books and articles on how to use this feature both as a run-time f= eature and a compile-time feature.

On Saturday, February 16, 2019 at= 3:43:01 PM UTC-6, libb...@gmail.com wrote:
Hi everybody,

I do not participate in C++ standardization, but I dislike <=3D> so much that I am=20 considering writing an proposal to stop it.
I know it is=20 futile to try to revert feature this big this late in C++20 cycle, it is mostly about doing the right thing=E2=84=A2 even when you hav= e zero chance of=20 success. :)

Draft=C2=A0 is here.

Feel free to comment objections, requests for clarification... in t= he document or reply here.
Also since I do not attend C++ standardization meetings if somebody likes=20 the draft and is interested in presenting it that would also be great.
<= /div>

regards,
Ivan

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