220 3785 article Path: news.gmane.org!not-for-mail From: Mikhail Semenov Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Dynamic Arrays: simple syntax Date: Sat, 20 Apr 2013 20:32:03 +0100 Lines: 153 Approved: news@gmane.org Message-ID: References: <5ddeccbe-40d0-4894-afc5-c0105136b5d7@isocpp.org> <5172E893.9020204@gmx.net> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary=001a11c20b82ed474904dacfe371 X-Trace: ger.gmane.org 1366486326 29878 80.91.229.3 (20 Apr 2013 19:32:06 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 20 Apr 2013 19:32:06 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDC55PNFRYGRBNG2ZOFQKGQE224I3DQ@isocpp.org Sat Apr 20 21:32:06 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ia0-f199.google.com ([209.85.210.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1UTdW2-0000ad-3f for gclcip-std-proposals@m.gmane.org; Sat, 20 Apr 2013 21:32:06 +0200 Original-Received: by mail-ia0-f199.google.com with SMTP id l29sf12799100iag.10 for ; Sat, 20 Apr 2013 12:32:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:x-beenthere:x-received:received-spf:mime-version :x-received:in-reply-to:references:date:message-id:subject:from:to :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:x-google-group-id:list-post :list-help:list-archive:list-subscribe:list-unsubscribe:content-type; bh=1aEomrKEWkI5gH7Fx4pUZVcUre74L4O2FsAyQdZif+M=; b=fbI7aL9vaayZNIfw0Hv+eNYcJCzdHhMbS7IWyBdUft0XZ2Lkd5M984/S5+1GxjBkSO ylDk9QJ8bDkMH0WD1Kg6OdmAPgBpTxnBZOSbgm7ATyWGV16zFcHJ/isx1PJO797FzuM+ jBKejCo9rGIsrAXl5Tf7ieA521ARuBmkVCrhOFP042+Io5rQ/3bW5sWdMYxpaKZ7SpAe 8Gh1bBGBKYX+5PhJFWHWTiaVcEhqfESAwIwP4ZxIDKrNMibVmx2I+e3PzPo7ALkVMvDP zN+vZPW8M42zWENT3DOZMu+Vk+P5cpClO5/RlDqtfEX776eXQ0oRbOk6KXub0fqT8vRn X-Received: by 10.182.230.169 with SMTP id sz9mr5017636obc.48.1366486325129; Sat, 20 Apr 2013 12:32:05 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.182.221.201 with SMTP id qg9ls503580obc.28.gmail; Sat, 20 Apr 2013 12:32:04 -0700 (PDT) X-Received: by 10.60.57.35 with SMTP id f3mr8267380oeq.33.1366486324065; Sat, 20 Apr 2013 12:32:04 -0700 (PDT) Original-Received: from mail-oa0-f52.google.com (mail-oa0-f52.google.com [209.85.219.52]) by mx.google.com with ESMTPS id l2si14537635oeh.20.2013.04.20.12.32.04 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sat, 20 Apr 2013 12:32:04 -0700 (PDT) Received-SPF: pass (google.com: domain of mikhailsemenov1957@gmail.com designates 209.85.219.52 as permitted sender) client-ip=209.85.219.52; Original-Received: by mail-oa0-f52.google.com with SMTP id n12so449642oag.39 for ; Sat, 20 Apr 2013 12:32:04 -0700 (PDT) X-Received: by 10.60.65.233 with SMTP id a9mr7361274oet.67.1366486323904; Sat, 20 Apr 2013 12:32:03 -0700 (PDT) Original-Received: by 10.60.85.34 with HTTP; Sat, 20 Apr 2013 12:32:03 -0700 (PDT) In-Reply-To: <5172E893.9020204@gmx.net> X-Original-Sender: mikhailsemenov1957@gmail.com X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of mikhailsemenov1957@gmail.com designates 209.85.219.52 as permitted sender) smtp.mail=mikhailsemenov1957@gmail.com; dkim=pass header.i=@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:3785 Archived-At: --001a11c20b82ed474904dacfe371 Content-Type: text/plain; charset=ISO-8859-1 Hello Jens, I looked at it. My concern is that the dynamic arrays it's just another container. I think the syntax should be much simpler. And then if somebody wants they can implement classes around it. How many array containers do we need? As for runtime-sized arrays (N3497) they are implemented on the stack. You cannot use them as object members, which is a shame. I think they should be allowed primarily as object members. The N3497 proposal closely follows C Standard (with some omissions). Regards, Mikhail. On 20 April 2013 20:12, Jens Maurer wrote: > On 04/20/2013 08:51 PM, Mikhail Semenov wrote: > > If you define > > void f(double a []); > > the sizeof(a) does not mean much either. > > Since the array decays to a pointer, it's the size of a pointer. > > > The operator= is not defined for arrays properly anyway (it compares > pointers). > > Are you talking about operator= or operator==? These are different. > > > But if you want, you can define operator= for the class and create > size() member inside the class. > > Did you look at the runtime-size arrays and dynarray proposals? > > http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3532.html > http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3497.html > > They cover as much ground as is feasible, I believe. > > Jens > > -- > > --- > 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/?hl=en. > > > -- --- 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/?hl=en. --001a11c20b82ed474904dacfe371 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Hello Jens,
=A0
I looked at it. M= y concern is that the dynamic arrays it's just another container. I thi= nk the syntax should be much simpler. And then if somebody wants they can i= mplement
classes around it.=A0 How many array containers do we need?
= =A0
As for runtime-sized arrays (N3497) they are implemented on t= he stack. You cannot use them as object members, which is a shame. I think = they should be allowed primarily as object members.
The N3497 proposal closely follows C Standard (with some omissions).
=A0
Regards,
Mikhail.


On 20 April 2013 20:12, Je= ns Maurer <Jens.Maurer@gmx.net> wrote:
On 04/20/2013 08:51 PM, Mi= khail Semenov wrote:
> If you define
> void f(double a []);
> the sizeof(a) does not mean much either.

Since the array decays to a pointer, it's the size of a pointer.<= br>

> The operator=3D is not defined for arrays properly anyway (it compares= pointers).

Are you talking about operator=3D or operator=3D=3D? =A0These are dif= ferent.

> But if you want, you can define operator=3D for the class and create s= ize() member inside the class.

Did you look at the runtime-size arrays and dynarray proposals?

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/20= 13/n3532.html
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/20= 13/n3497.html

They cover as much ground as is feasible, I believe.

Jens

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Visit this group at http://groups.google.com/a/isocpp= ..org/group/std-proposals/?hl=3Den.



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