220 13624 article Path: news.gmane.org!not-for-mail From: Matthew Fioravante Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: The view concept Date: Fri, 3 Oct 2014 10:25:10 -0700 (PDT) Lines: 176 Approved: news@gmane.org Message-ID: References: <428c47bd-67f2-47d1-98c0-e5ca85698076@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_575_946484599.1412357110388" X-Trace: ger.gmane.org 1412357120 29163 80.91.229.3 (3 Oct 2014 17:25:20 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 3 Oct 2014 17:25:20 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDELF54RTIGRB55XXOQQKGQELDXBAIA@isocpp.org Fri Oct 03 19:25:13 2014 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-pa0-f71.google.com ([209.85.220.71]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1Xa6bR-0001AS-62 for gclcip-std-proposals@m.gmane.org; Fri, 03 Oct 2014 19:25:13 +0200 Original-Received: by mail-pa0-f71.google.com with SMTP id rd3sf12711977pab.2 for ; Fri, 03 Oct 2014 10:25:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; 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 :content-type; bh=nDBvSOmW7X+wN9fO087TErJu1lknAOJvVVVLaxW8JD4=; b=0MJWEV0uvmfueuk2eaawNtTxIsLBJc5yRTRteX1LcvDWqMTtAqrxFqBcK5DoZHejZb RXiAR6a6MUk5VsoxcnPI19xCByiEP8EFjeDUjep+zjCoFDRDS8DLo5Dt55fLwPEz3Bn5 U7tA3rhzlYgzFsP4LJLjrE0RtwdtingVQZ7RJFNtA1Y8wL2cDhm37a0uRkDFuEi+jQtP hmeQe1dbMeBkaQTeWFfQcgJn9+unutsrmQJg9uIQs4/SOKa1teSRuOwskrRpdYs3/GiQ nKu0fDFbOXxdBRjXiBxKZk4TiLYbbFpl6JOK+jnGR4Qev5IMIwxdccm9j2AxmWuCYXpD QCKw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; 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:list-post:list-help:list-archive :list-subscribe:list-unsubscribe:content-type; bh=nDBvSOmW7X+wN9fO087TErJu1lknAOJvVVVLaxW8JD4=; b=Jxftb8cFqulTbblj0lBEuHQyN52tdaaSo4dOzdro4TqJ8w6UNt9NSWS/7jBXLZx6WY nZgun0FSbqDh3e3BXXRHuQCNC5B8w4Fz57SXS041FYaUVHBNPPEdFGs3qBRhC1Qyocr+ ynKJGbJE/bjIuWwOsUaoMfp53dFOjHmjc7YEU3la8z4Knn0Go+twzNv7fxNyDsfpuUxN 2lVTvxi7ctRODHjuj2fySFoUz+ETc3A8uLtl9pe8shkwtQ1ZS3zbngqy/sM2JQkpYv8g NTaq6dUx0BWHlSS0oqG/6Cqo29hGWgKgnuf8AMkVhlg8lxGFQHGjqoft8YFlKYtsQJiP oqqQ== X-Gm-Message-State: ALoCoQlS0xCmYv+Gi1numIbKVHgLGLsEO/6RIGr2eyeXCk3rtibn56wBYahT2scDHqzlWqQb1AvF X-Received: by 10.66.188.104 with SMTP id fz8mr2647326pac.6.1412357111830; Fri, 03 Oct 2014 10:25:11 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.140.81.82 with SMTP id e76ls1225984qgd.87.gmail; Fri, 03 Oct 2014 10:25:10 -0700 (PDT) X-Received: by 10.140.31.195 with SMTP id f61mr441qgf.41.1412357110918; Fri, 03 Oct 2014 10:25:10 -0700 (PDT) In-Reply-To: X-Original-Sender: fmatthew5876@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:13624 Archived-At: ------=_Part_575_946484599.1412357110388 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Friday, October 3, 2014 12:54:14 PM UTC-4, Tony V E wrote: > > > > On Fri, Oct 3, 2014 at 9:17 AM, Klaim - Jo=C3=ABl Lamotte > wrote: > >> I think that the most important question to answer is: what would be the= =20 >> difference between a range and a view?=E2=80=8B >> > > One major likely difference is that range =3D=3D will probably be 'shallo= w'. =20 > Deep-compare will probably be a function. > I suppose the difference is that a range is a subset of a container, where= =20 as a view is a container itself, that is a non-owning container. In this=20 sense a view is not actually a range at all but you can create a range over= =20 a view for generic algorithm processing. You can also create a view from a= =20 range. Since view is a container, operator=3D=3D is deep because its operating on = the=20 container contents. However view is a non-owning container, so operator=3D= =20 reassigns it to a new owner. We should have some way to do shallow compare= =20 and deep copy for a view. =20 > =20 > In general, I think a 'view' is this name we use where we'd like to use= =20 > range, but know that we haven't solidified what we mean by range yet, so = we=20 > are punting and going with 'view' for now. > > Also a view is a less-generic range. ie string_view has more than just= =20 > range features, it also copies over all the functions from string. > I think we should not call a view a range at all but a kind of container. =20 > > > It looks to me that current researches on ranges suggest that the=20 >> distinction exists (or at least between ranges and containers). >> >> --=20 >> >> ---=20 >> You received this message because you are subscribed to the Google Group= s=20 >> "ISO C++ Standard - Future Proposals" group. >> To unsubscribe from this group and stop receiving emails from it, send a= n=20 >> email to std-proposal...@isocpp.org . >> To post to this group, send email to std-pr...@isocpp.org . >> Visit this group at=20 >> http://groups.google.com/a/isocpp.org/group/std-proposals/. >> > > --=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. Visit this group at http://groups.google.com/a/isocpp.org/group/std-proposa= ls/. ------=_Part_575_946484599.1412357110388 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable


On Friday, October 3, 2014 12:54:14 PM UTC-4, Tony= V E wrote:

On Fri, Oct 3, 2014 at 9:17 AM, Klaim= - Jo=C3=ABl Lamotte <mjk...@gmail.com> wrote:
I think that the most important qu= estion to answer is: what would be the difference between a range and a vie= w?=E2=80=8B

One major likely dif= ference is that range =3D=3D will probably be 'shallow'.  Deep-compare= will probably be a function.

I suppose the difference is that a range is a subset of a contain= er, where as a view is a container itself, that is a non-owning container. = In this sense a view is not actually a range at all but you can create a ra= nge over a view for generic algorithm processing. You can also create a vie= w from a range.

Since view is a container, operator=3D=3D is deep be= cause its operating on the container contents. However view is a non-owning= container, so operator=3D reassigns it to a new owner. We should have some= way to do shallow compare and deep copy for a view.
 
 
In general, I think a 'view' is = this name we use where we'd like to use range, but know that we haven't sol= idified what we mean by range yet, so we are punting and going with 'view' = for now.

Also a view is a less-generic range. = ie string_view has more than just range features, it also copies over all = the functions from string.
I think we should not call a view a range at all but a kind of container.<= br> 


It looks to me that = current researches on ranges suggest that the distinction exists (or at lea= st between ranges and containers).

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