220 19168 article Path: news.gmane.org!not-for-mail From: David Haim Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Point class Date: Wed, 22 Jul 2015 20:46:08 +0300 Lines: 70 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=047d7b4724e28ab405051b7a5874 X-Trace: ger.gmane.org 1437587171 25305 80.91.229.3 (22 Jul 2015 17:46:11 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 22 Jul 2015 17:46:11 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCPLZIX24MDRBYNNX6WQKGQEGGFRUWA@isocpp.org Wed Jul 22 19:46:10 2015 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-la0-f72.google.com ([209.85.215.72]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZHy5q-0006Jf-Ga for gclcip-std-proposals@m.gmane.org; Wed, 22 Jul 2015 19:46:10 +0200 Original-Received: by laef2 with SMTP id f2sf60974405lae.0 for ; Wed, 22 Jul 2015 10:46:09 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:content-type: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=a3Abww8WpjNmn4nddIQkYWlx7jGcQSt19vVn5Fkaa+0=; b=gny8MB1YYGb5WgNZeWWzlk09cCTtET8wmmvcWY1FyNDwIG6ovlsp9uammxpBmZI3DV WK0giEoCtfdhNsTD8f5iznRjE6sAJkYoHaDscGxtvcAXOOUS45Azm9ga05Mg1uPvNxpI 9lwtvj5y2ARmkj6E80QbTgROLKYLtnJaHhW/hG7IslRt8SgEOqjONmYBKD2jAwXy+JCA 9cGYsgUy+e4Tsv/errXk4rZvY7mBCRdOHg4S+1cZBDs0b7FRlOfNf/roCGFpx7shjiS1 ad3M9WRFw7sg3SQmjXKLuMxHg7WtuamYIR8fhPFwMEzukZs5PkqkulJ5nuFICL5jGV3i A6/g== X-Gm-Message-State: ALoCoQmpj48oOaAeHQRk75/uw5Al2tmSQgK8IuzOe4DbNIDRuoALPwhuu1CnjULOV0IUt3+qxyeK X-Received: by 10.180.160.133 with SMTP id xk5mr7018939wib.1.1437587169922; Wed, 22 Jul 2015 10:46:09 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.180.81.41 with SMTP id w9ls1177141wix.54.canary; Wed, 22 Jul 2015 10:46:09 -0700 (PDT) X-Received: by 10.180.36.16 with SMTP id m16mr8402527wij.26.1437587169113; Wed, 22 Jul 2015 10:46:09 -0700 (PDT) Original-Received: from mail-wi0-x22e.google.com (mail-wi0-x22e.google.com. [2a00:1450:400c:c05::22e]) by mx.google.com with ESMTPS id o5si4802895wiz.39.2015.07.22.10.46.09 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 22 Jul 2015 10:46:09 -0700 (PDT) Received-SPF: pass (google.com: domain of dhayim1@gmail.com designates 2a00:1450:400c:c05::22e as permitted sender) client-ip=2a00:1450:400c:c05::22e; Original-Received: by wibxm9 with SMTP id xm9so173992733wib.0 for ; Wed, 22 Jul 2015 10:46:09 -0700 (PDT) X-Received: by 10.194.23.225 with SMTP id p1mr7705862wjf.155.1437587168996; Wed, 22 Jul 2015 10:46:08 -0700 (PDT) Original-Received: by 10.28.88.21 with HTTP; Wed, 22 Jul 2015 10:46:08 -0700 (PDT) In-Reply-To: X-Original-Sender: Dhayim1@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of dhayim1@gmail.com designates 2a00:1450:400c:c05::22e as permitted sender) smtp.mail=dhayim1@gmail.com; dkim=pass header.i=@gmail.com; dmarc=pass (p=NONE 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:19168 Archived-At: --047d7b4724e28ab405051b7a5874 Content-Type: text/plain; charset=UTF-8 yes, every vector can be built from the origin to some point, thus any point can represent a vector (starting from the origin) and vice-versa. a point is definitely not a vector, and a vector is not a point. saying that one is redundant is not mathematically right. plus, let's say in the future we want to implement a "Rectangle" or "Circle" shape, I don't see how mathematically speaking a rectangle is composed from 4 vectors. It is composed from 4 points. also, mathematically speaking, a vector has something a point doesn't have - direction. when I say Point(1,2) -> I do not imply any direction. it's a point, it has no direction what so ever. but if you insist that a point is a vector , you are recognizing the vast utilities a Point can have: the entire linear algebra and the virtual graphics use it as key feature. this is exactly why C++ has to standardize it. -- --- 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. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposals/. --047d7b4724e28ab405051b7a5874 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
yes, every vector c= an be built from the origin to some point, thus any point can represent a v= ector (starting from the origin) and vice-versa.
a point is definitely not a vector, and a vector is not a= point. saying that one is redundant is not mathematically right.
plus, let's say in the future we wan= t to implement a "Rectangle" or "Circle" shape, I don&#= 39;t see how mathematically speaking a rectangle is composed from 4 vectors= .. It is composed from 4 points.=C2=A0

also, mathematica= lly speaking, a vector has something a point doesn't have - direction.= =C2=A0
when I say Point(1,2) -&= gt; I do not imply any direction. it's a point, it has no direction wha= t so ever.

but if you insist that a point is a vector , y= ou are recognizing the vast utilities a Point can have: the entire linear a= lgebra and the virtual graphics use it as key feature. this is exactly why = C++ has to standardize it. =C2=A0 =C2=A0

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