220 7203 article Path: news.gmane.org!not-for-mail From: Evgeny Panasyuk Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: "count_while" and "count_until" algorithms Date: Tue, 8 Oct 2013 15:59:48 -0700 (PDT) Lines: 130 Approved: news@gmane.org Message-ID: References: <2602b3fd-fccd-459b-be1a-93a12005dc5c@isocpp.org> <231e6ef1-599d-4877-be6c-55e85e5a4e41@isocpp.org> <6e15fc38-8be3-4e74-ade9-e25a8d0e0509@isocpp.org> <2a52a3ad-4fe6-4f77-870c-2a26c2e10e52@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_993_6675106.1381273188716" X-Trace: ger.gmane.org 1381273187 29560 80.91.229.3 (8 Oct 2013 22:59:47 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 8 Oct 2013 22:59:47 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBC54TLGKR4LBBZU42KJAKGQER2TOIVY@isocpp.org Wed Oct 09 00:59:53 2013 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ob0-f198.google.com ([209.85.214.198]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1VTgFs-0003aK-6l for gclcip-std-proposals@m.gmane.org; Wed, 09 Oct 2013 00:59:52 +0200 Original-Received: by mail-ob0-f198.google.com with SMTP id va2sf5126159obc.9 for ; Tue, 08 Oct 2013 15:59:51 -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=laey7fP6H53K7YdBTxRTKGbdpHRRKiviYLsQTCdP7qk=; b=EqjaGae3cSPsI/KL5bqTzNKXYos6yUpzqgLQ8crHBMlnyxCOKQNC9jPgHbHEVaD6Mr 3WnmE+4LhUtD/8D4T5hWA+7ndMF8bvdLbEkndoGWGAxrn5BPykV3E5nQwdIXyuP6FaxJ bm03RP5Nbs3weNY1mEAsY4IK4ViicSpkjxA9yvH1rNvvgqITaX8cilF9HUBqSHHJcpk0 xkvUpk6mIQlQSPEyksVSsTPjDD5X+/GvBiYvVMiuHmUjZfUPggL6CBj3bjnQfYRGaGMc 10IwZRLGHCBWN2Mu5k/pHqg6jt2aSZ7z4pPICZ0rDv7eX6XsnSiSLfbYkek4H+xbxNDS pYdg== X-Received: by 10.50.134.166 with SMTP id pl6mr71155igb.2.1381273191179; Tue, 08 Oct 2013 15:59:51 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.50.134.200 with SMTP id pm8ls1383786igb.2.canary; Tue, 08 Oct 2013 15:59:50 -0700 (PDT) X-Received: by 10.50.22.35 with SMTP id a3mr550igf.17.1381273190628; Tue, 08 Oct 2013 15:59:50 -0700 (PDT) In-Reply-To: X-Original-Sender: evgeny.panasyuk@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:7203 Archived-At: ------=_Part_993_6675106.1381273188716 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable 9 oct 2013 =D0=B3., 1:17:17 UTC+4 Daniel Kr=C3=BCgler : > > 2013/10/8 Evgeny Panasyuk >:=20 > > 9 oct 2013 =D0=B3., 1:00:37 UTC+4 Daniel Kr=C3=BCgler:=20 > >> See also=20 > >> http://cplusplus.github.io/LWG/lwg-active.html#2242=20 > >> for another miss of useful information.=20 > >> Unfortunately,=20 > >> http://cplusplus.github.io/LWG/lwg-closed.html#1313=20 > >> was declared NAD. I think I will re-raise it soon.=20 > >=20 > > That is unfortunate. But I am not sure how it can be fixed. New=20 > algorithm or=20 > > breaking change?=20 > > I think the chances are good that the return type will be changed. We=20 > did so in similar cases, such as in=20 > > http://cplusplus.github.io/LWG/lwg-defects.html#488=20 > http://cplusplus.github.io/LWG/lwg-defects.html#865=20 > These are a bit different case - originally they had void return type, and= =20 it is easy to change void to something. But in case of std::copy_n - it already has some return type, and change of= =20 that type would be breaking change. =20 > > > I remember that Alexander Stepanov mentioned that issue in "Efficient= =20 > > Programming with Components".=20 > > He said something like: "First they throw away counted ranges for C++98= ..=20 > In=20 > > C++11 they tried to return something, but did it wrong." (maybe I will= =20 > find=20 > > link a bit later).=20 > > ;-)=20 > Ok, I have found that moment regarding copy_n:=20 http://www.youtube.com/watch?v=3DdUEA8fHx0r0&t=3D35m14s --=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_993_6675106.1381273188716 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
 9 oct 2013 =D0=B3., 1:17:17 UTC+4 Daniel Kr=C3= =BCgler :
2013/10/8 Evgeny Pana= syuk <evgeny....@gmail.com>:
> 9 oct 2013 =D0=B3., 1:00:37 UTC+4 Daniel Kr=C3=BCgler:
>> See also
>> http://cplusplus.github.io/LWG/lwg-active.html#224= 2
>> for another miss of useful information.
>> Unfortunately,
>> http://cplusplus.github.io/LWG/lwg-closed.html#131= 3
>> was declared NAD. I think I will re-raise it soon.
>
> That is unfortunate. But I am not sure how it can be fixed. New al= gorithm or
> breaking change?

I think the chances are good that the return type will be changed. We
did so in similar cases, such as in

http://cplusplus.github.io/LWG/lwg-defects.html#488
http://cplusplus.github.io/LWG/lwg-defects.html#865

These are a bit different case - originally they = had void return type, and it is easy to change void to something.
But in= case of std::copy_n - it already has some return type, and change of that = type would be breaking change.
 

> I remember that Alexander Stepanov mentioned that issue in "Effici= ent
> Programming with Components".
> He said something like: "First they throw away counted ranges for = C++98. In
> C++11 they tried to return something, but did it wrong."  (ma= ybe I will find
> link a bit later).

;-)

Ok, I have found that moment regarding copy_n: ht= tp://www.youtube.com/watch?v=3DdUEA8fHx0r0&t=3D35m14s

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