220 41521 article Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Barry Revzin Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Anybody interested in reviewing draft/presenting "anti" spaceship paper? Date: Fri, 1 Mar 2019 11:49:21 -0800 (PST) Approved: news@gmane.org Message-ID: References: <544de10d-be39-4c83-a211-b888a34724c3@isocpp.org> <7ca8c57f-64d6-44aa-9bcf-1ae2535b3a26@isocpp.org> <82f8dd84-6321-437d-9a40-ff6ee6e014fb@isocpp.org> Reply-To: std-proposals@isocpp.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_290_729406082.1551469761176" Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="68626"; mail-complaints-to="usenet@blaine.gmane.org" To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCJJTG7CS4ARBQUZ43RQKGQEM5IT7OA@isocpp.org Fri Mar 01 20:49:25 2019 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yw1-f71.google.com ([209.85.161.71]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.89) (envelope-from ) id 1gzo9s-000HhK-Jn for gclcip-std-proposals@m.gmane.org; Fri, 01 Mar 2019 20:49:24 +0100 Original-Received: by mail-yw1-f71.google.com with SMTP id w185sf3231728ywd.4 for ; Fri, 01 Mar 2019 11:49:24 -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=N07QHGMzFrWA0xP8kLli+NH1zGZLD80aM9xIFfN0FAE=; b=GUs5jywY2VckImnR1kyHUmlC6GaT5puyLHAaBu6ezJFipBsQH5r/ANFZ0Pk79wXKyR AM6gn9At3r7e/ccg+oAZmyrWm3pX4/6hrty5KLCG+MGfGtbiwfpTXY9MwNDVO7x4CUZC b2ES0jtVbjPGoY3kPA6BN58b+wW4Q9P2nUKfl6OzMewnTuPTbLZA1AgZQ0SzG3g+utZs M6pDys+iAiankseVnZmSsIVyOFwAdC2aRBHa5g6cH98pntFnYSuxWC/mkV2xao2t299O nLyblqIepZVwHCsc6vCR0UNdKhOFOvInR66x/nU8tKz+FDJ+drZ1xmmhrizg1R8pEaBJ XMcg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; 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=N07QHGMzFrWA0xP8kLli+NH1zGZLD80aM9xIFfN0FAE=; b=g0EtgBlacveOcOeswKFMObBvbvrFNsmCqoHyu98GYXw0H0aBYsA5XMc9NnvR7aLwy8 2ZZt83FMF6gXLgw0flasphW820a+Fx6TCJvI7ZijHgp9E69tBMpUKFfCyLlJudTpI4fl VeWuD0Yb6qBbmGxueN3k77WXW4UhnF60ULG9DkAa3dW1nJbQNYKj0kyj6qIbBfu3G1YC FccuvUmPil9ty21SCI5Y8u94qks7vsmz9cE1R3oFIzndm0U6oZi03lmfoePuHiTF+8Kh EqBYa2c7kjONvPaYQTHQViHb+4fwJyUgm3n5IBLxN+/gYXSgtX1WR7epOJNP0Zf6bgfj 05Gg== 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=N07QHGMzFrWA0xP8kLli+NH1zGZLD80aM9xIFfN0FAE=; b=qohboTstIydsgBVYpuLMN7KxBy+NVTjrJzquden72IVE4y1pXeL52qpwgYJn/HlDVJ lBS8ljKdcFw2Os9fl4UnYh0IFizkMjnNBv7nfBCBKNHLIunhUA5K/ZpounENTHS6AaRd C8qQ0+IE8WVboLiv5WyfyzEncvL50xcQ/Lk5guXj97JaI5Yab2oUS1dItB/k9iGbPan+ yUTnezoDC8xQkrsblzBPtj2RovbEs7x2MdHfAznQL9z7HkkcAinLk8PKJqhFg7iVDbAP Y1zVAFeeReG2fqOdoadUKmBRxdY76Ip6whj7jxVS8Afbmlz56K7dhGaqyj/ajrjl0nLz CyKQ== X-Gm-Message-State: APjAAAUMsTu0p3GEC6aOEnMFz52qdRqb5WbN/2uwyvepfPVZ55SoRuRV Yt7hUgJNfH48yu4vrbMwpuyBTQ== X-Google-Smtp-Source: APXvYqxMEydQcoFItOGn80Kj8NXsNyf3pHOfqrdWQlXMjmeOnpfCixIc6W2icHva4jRmJrTD+CEmyQ== X-Received: by 2002:a25:bed2:: with SMTP id k18mr3150195ybm.72.1551469763330; Fri, 01 Mar 2019 11:49:23 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 2002:a81:5888:: with SMTP id m130ls1828116ywb.9.gmail; Fri, 01 Mar 2019 11:49:22 -0800 (PST) X-Received: by 2002:a0d:e781:: with SMTP id q123mr5248264ywe.378.1551469761930; Fri, 01 Mar 2019 11:49:21 -0800 (PST) In-Reply-To: <82f8dd84-6321-437d-9a40-ff6ee6e014fb@isocpp.org> X-Original-Sender: Barry.Revzin@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:41521 Archived-At: ------=_Part_290_729406082.1551469761176 Content-Type: multipart/alternative; boundary="----=_Part_291_159041587.1551469761176" ------=_Part_291_159041587.1551469761176 Content-Type: text/plain; charset="UTF-8" On Friday, March 1, 2019 at 1:31:10 PM UTC-6, Barry Revzin wrote: > > On Friday, March 1, 2019 at 10:47:41 AM UTC-6, Ivan Matek wrote: >> >> >> >> On Mon, Feb 25, 2019 at 2:40 PM Barry Revzin wrote: >> >>> On Saturday, February 16, 2019 at 3:43:01 PM UTC-6, libb...@gmail.com >>> wrote: >>> <=> will be in C++20 >>> >> Disappointed, not surprised. :) >> >> >>> >>> But what does <= do? You have two choices: >>> Which do you pick? >>> >> Why do you not just use member's <=? >> > > You can do. It just means that if you're a type that provides something > other than lexicographic, member-wise comparison, you have to write *both* < > and <= (in addition to ==). Whichever way you go about doing (which > typically will just be <= just invoking <), that still seems worse than > just being able to write one <=>. > > The only real benefit of this approach vs the <=> we have in C++20 is > slightly shorter defaulting of comparisons? That doesn't seem like a good > tradeoff when comparing the two options. > And to elaborate, it really is only slightly shorter: default operator: <, <=, ==, !=, >=, >; // proposed here auto operator<=>(C const&) const = default; // C++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 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/fafecf1b-2bb2-4803-8745-797bd8cbb4ac%40isocpp.org. ------=_Part_291_159041587.1551469761176 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Friday, March 1, 2019 at 1:31:10 PM UTC-6, Barr= y Revzin wrote:
On Friday, March 1, 2019 at 10:47:41 AM UTC-6, Ivan Matek wrote:

=
On Mon, Feb 25, 2019 at 2:4= 0 PM Barry Revzin <barry....@gmail.com> wrote= :
On Saturday, February 16, 2019 at 3:43:01 PM UTC-6, libb...@gmail.com= wrote:
<=3D> will be in C++20
D= isappointed, not surprised. :)
=C2=A0

But w= hat does <=3D do? You have two choices:
Which= do you pick?
Why do you not just= use member's <=3D?

You can do. It just means that if you're a type that provides somethin= g other than lexicographic, member-wise comparison, you have to write bo= th=C2=A0< and <=3D (in addition to =3D=3D). Whichever way you go = about doing (which typically will just be <=3D just invoking <), that= still seems worse than just being able to write one <=3D>.=C2=A0

The only real benefit of this approach vs the <=3D= > we have in C++20 is slightly shorter defaulting of comparisons? That d= oesn't seem like a good tradeoff when comparing the two options.
<= /div>

And to elaborate, it really is only s= lightly shorter:

default operator: <, <=3D, =3D=3D, !=3D, >=3D, >;=C2=A0 = =C2=A0 =C2=A0 // proposed here
auto oper= ator<=3D>(C const&) const =3D default;=C2=A0 // C++20
=


--
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/fafecf1b-2bb2-4803-8745-797bd8cbb4ac= %40isocpp.org.
------=_Part_291_159041587.1551469761176-- ------=_Part_290_729406082.1551469761176-- .