220 27255 <2e118de4-f49a-4c12-b0d3-d881d3660d43@isocpp.org> article Path: news.gmane.org!not-for-mail From: gmisocpp@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: loop continuation code Date: Mon, 25 Jul 2016 14:12:12 -0700 (PDT) Lines: 156 Approved: news@gmane.org Message-ID: <2e118de4-f49a-4c12-b0d3-d881d3660d43@isocpp.org> References: <2f575934-e078-411c-9c8a-c2996da7609d@isocpp.org> <28358863-5be0-401a-893a-0ae5385156c2@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_1433_102576338.1469481132284" X-Trace: ger.gmane.org 1469481139 5527 80.91.229.3 (25 Jul 2016 21:12:19 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 25 Jul 2016 21:12:19 +0000 (UTC) Cc: gmisocpp@gmail.com To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCM3TRNUXUDBBLMB3K6AKGQECGUWJWI@isocpp.org Mon Jul 25 23:12:18 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qk0-f199.google.com ([209.85.220.199]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1bRnAf-00083x-C0 for gclcip-std-proposals@m.gmane.org; Mon, 25 Jul 2016 23:12:17 +0200 Original-Received: by mail-qk0-f199.google.com with SMTP id a123sf464799450qkd.2 for ; Mon, 25 Jul 2016 14:12:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc: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=X0M+z6vUBFhFhnQfw8rQ5r7VmDZ2fKVb4H0DJiJ248k=; b=00Td+vib7EmnlhLzXh/LaXGFXA9P2C+Kh4QQVlDY9Ra+XSViOuTAD3lqh6k/pf/L8U rWhcJoJlgaAOkpxr/1gtgGNjshp0ytROOCgTuJ2VLE2xT4myvzhJCmL0KcIp1JpMst74 U60k1yw2neC7bD84R3q+nUhoq3baKD+ySDee+rMycoJPThcqsc8yNBrrUBNjafHZxWTD /r+baJH1ZEy/sv7p2XCd9ucjrRnglY985KE4drA4jNfnELxHPCHkxwJnTtOa1TKZ021V IRMc3twZQ/h0//QH90aPDKqLFhvaGWk+663avjZcyh5TIdNZSZXQRnNkZLSha2f2bE4d G/8A== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:from:to:cc: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=X0M+z6vUBFhFhnQfw8rQ5r7VmDZ2fKVb4H0DJiJ248k=; b=o2a9baoIbnkFEOJJp3ZpL9vTtdWH9qmj4Iobr4psHLTqzqJHvqejxFjxj9hD0O6o3L eTUUw3e1k8GcBgUkAs/jaw7I3NUrKF2nJkhgT0Yr2NfDEqjK13yMjLYh5XkNgsuwl71B 8S+OlRXedExleMET+VyGMxF1YQtQyKkOHZJnkS8mzExkcLmhRStRD9XeQ0oBW3wtAGEL pMK7zrT92D6ZIKkUk1QiQdaJPn6Elrf0sMTdOoD7TQMgh2PVRCWNeDH0Kbsz7vlhS14f 68FFlrGjuYw/t4AkLGsLUq6pIxRY7bmpxWspudfuy+PEMLdPbRWuUH7wc452pHCfQKsS 4WCw== 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:cc: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=X0M+z6vUBFhFhnQfw8rQ5r7VmDZ2fKVb4H0DJiJ248k=; b=SyQ0tbhRPizfO7NOyIwDZceT0BgmQIwUG92xEL6HdlTcbNquSv3g0cYJpYPhPULL3Y I0iHeHq/7L+l9tRVTrTBI8BPmLSIm7g4uaZdfYu1eDmwwZxKKkKCtkrJiO3HyNe3Z1pt ZEHhEgkJLrVjRoBpln7CPpufqwLEqZBOPRNiDVFhCxioQgu/qpq2KmYyLJ6SXvREW9uQ IVm9X7Ls2yI8hfq9Ye43kGr6BX/31eFbPXBu8gTOvqYH4HJb9pfBW1I9svvJTLbMsaWQ kSkgwYAoVHbNSiDDrXq/4fTvkKiGg206oufAtBaaKbwmDQxuauBnNiInfTYQ4Ccu3uYs 1H7g== X-Gm-Message-State: AEkoouuuWboL+PXFR6Z0RvzAA8SPHRWXGaCVu0FvwsPx6C5RD6vXT2/cUA7KXPBFaNwz6g== X-Received: by 10.176.1.116 with SMTP id 107mr17450233uak.8.1469481136375; Mon, 25 Jul 2016 14:12:16 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.36.236.2 with SMTP id g2ls3849570ith.22.gmail; Mon, 25 Jul 2016 14:12:12 -0700 (PDT) X-Received: by 10.36.217.2 with SMTP id p2mr642469itg.5.1469481132835; Mon, 25 Jul 2016 14:12:12 -0700 (PDT) In-Reply-To: <28358863-5be0-401a-893a-0ae5385156c2@isocpp.org> X-Original-Sender: gmisocpp@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:27255 Archived-At: ------=_Part_1433_102576338.1469481132284 Content-Type: multipart/alternative; boundary="----=_Part_1434_234713489.1469481132284" ------=_Part_1434_234713489.1469481132284 Content-Type: text/plain; charset=UTF-8 Hi Nicol Thanks for your comments. On Tuesday, July 26, 2016 at 3:08:23 AM UTC+12, Nicol Bolas wrote: > I get the idea, but I really don't like the syntax for it. Especially > since it's based on a symptom (ie: how you would write it with goto) rather > than the problem. > I think you correctly understand the problem statement, but I'm less sure from you're wording that you appreciated what I actually proposed and that I too understand the problem statement. See below: > The actual problem is that there are times when your iteration statement > can't be a single expression. So what you want is to have a > multi-expression iteration statement. So... do that: > > for ( int i = 0; pUnicast != NULL; > pUnicast = pUnicast->Next; i++) > This puts all of the iteration logic in the same place: the `for` statement itself. So if you want to see what happens on each loop, you don't have to look at both the top and the bottom of the `for` statement. Yes that is the problem, but I don't like the existing for loops syntax, so I'm not sure it's meaningful to propose that back to me, especially when my proposal also catered for the logic being at the top of the loop. See: for ( int i = 0; pUnicast != NULL; ) { continue { pUnicast = pUnicast->Next; ++I; } // whatever } I'm hearing you don't like my proposed syntax. let's find a better one then. You are currently holding onto the existing syntax and I don't find that superior to my suggestion for anything but the most trivial of situations. I'm looking for something that scales better for the non trivial situations. Thanks -- 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/2e118de4-f49a-4c12-b0d3-d881d3660d43%40isocpp.org. ------=_Part_1434_234713489.1469481132284 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi Nicol

Thanks for your com= ments.

On Tuesday, July 26, 2016 at 3:08:23 AM UTC+12, Nicol Bolas w= rote:
I get the ide= a, but I really don't like the syntax for it. Especially since it's= based on a symptom (ie: how you would write it with goto) rather than the = problem.

I think you correc= tly understand the problem statement, but I'm less sure=C2=A0from you&#= 39;re wording that you appreciated=C2=A0what I actually=C2=A0proposed=C2=A0= and that I too understand the problem statement.
See below:
=


The a= ctual problem is that there are times when your iteration statement can'= ;t be a single expression. So what you want is to have a multi-expression i= teration statement. So... do that:

for ( int i =3D 0; pUnicast !=3D NULL<= span style=3D"color: rgb(102, 102, 0);">;
=C2=A0 pUnicast =3D pUnicast->Next; i++)

This = puts all of the iteration logic in the same place: the `for` statement itse= lf. So if you want to see what happens on each loop, you don't have to = look at both the top and the bottom of the `for` statement.

<= /div>
Yes that is the problem,=C2=A0but I don't like the existing f= or loops syntax, so I'm not sure it's meaningful to propose that ba= ck to me, especially when my proposal also catered for the logic being at t= he top of the loop. See:

for ( int i = =3D 0; pUnicast !=3D NUL= L; )
{
=C2=A0=C2=A0continue {
=C2=A0 pUnicast =3D= pUnicast->Next;
=C2=A0 = ++I;
=C2=A0=C2=A0= }
// whatever
}


I'm hearing you do= n't like my proposed syntax.=C2=A0let's=C2=A0find a better one then= .. You are currently holding onto the existing syntax and I don't find t= hat superior to my suggestion for anything but the most trivial of situatio= ns. I'm looking for something that scales better for the non trivial si= tuations.


Thanks

--
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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/2e118de4-f49a-4c12-b0d3-d881d3660d43= %40isocpp.org.
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