220 27253 article Path: news.gmane.org!not-for-mail From: Viacheslav Usov Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: loop continuation code Date: Mon, 25 Jul 2016 18:38:08 +0200 Lines: 67 Approved: news@gmane.org Message-ID: 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/alternative; boundary=001a113fb874dbb6450538786851 X-Trace: ger.gmane.org 1469464700 5332 80.91.229.3 (25 Jul 2016 16:38:20 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 25 Jul 2016 16:38:20 +0000 (UTC) Cc: gmisocpp@gmail.com To: "ISO C++ Standard - Future Proposals" Original-X-From: std-proposals+bncBDU6VRPKW4BBB4UA3G6AKGQEU2HH5PI@isocpp.org Mon Jul 25 18:38:14 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wm0-f71.google.com ([74.125.82.71]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1bRitQ-0001X5-3O for gclcip-std-proposals@m.gmane.org; Mon, 25 Jul 2016 18:38:12 +0200 Original-Received: by mail-wm0-f71.google.com with SMTP id x83sf82360286wma.2 for ; Mon, 25 Jul 2016 09:38:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc: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=SS7G50mGxjOTejo52WkJyzSdhWi9uSfQI3iAYdNIXpg=; b=XnXN52GXHfRDO/51vnCJJtYsjw5ywBJHo5rtEcnp2wTt7NRynvb2fJGVHdxy5nkCt0 GjBKlmTa3aiXDV+K6wlpPEMSeVEL97IaK+9eY//tI/zVNJgCeP9V2QRFoaYDuEAE2JyA 888pEpvh5BGRdhiP53xQMHAQB3KKqHd0dpcBohCpBM5y6dZ9mYohF2hfohKfwodNe0ui G3kRMkepbkIsIvY6UIvIrm9tIoQa99RdzVFcTTkigqXW4cJ79noW1K/iKiJDHiSLVY86 L72OMlCU+wRj6vwom8/duGZRyXA04e264wFFyX1EfSMP/32CgW99A0I4FpXOnkXQ1KZE s0/g== 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:from:date :message-id:subject:to:cc: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=SS7G50mGxjOTejo52WkJyzSdhWi9uSfQI3iAYdNIXpg=; b=QZqS9+Nnd/PaZ5DdDqHbFcG63R6pdckU6up+8JiyxEYHqnRPCY6bZnSFiFWZ7OPQIT pllHTWh5zQLSoxQtFTOGkk/c3GWvzmJeDKlo/TiC4qBHcXaJZs8bCV78xt8V0RZnVMD1 h3IyRogxXEfsaNEC6dzjKS6YNBdUqAj+Xy0HmMThlRNxwRi4nqkEkx01KTODdXmUS1Hr OhQ6Aqh60Y5XQf3WI9mXPLt0wceW33OAEEFUiujZlsolqhVJRTklV5J1f49Q/jeH+g7u ITrHPsjEKuw24x0oZ0e/yCw54oC7dKX2r3jgltK269tL/Hxd7xOmQEQIjIqHsdm8cg9k QZog== X-Gm-Message-State: AEkooussvGjy2ptqTomhmDRWGMRKUFww6FixJxWVUeek2fkVJvo7XeOHr5JDhn1C2TFq1g== X-Received: by 10.194.119.105 with SMTP id kt9mr2100003wjb.1.1469464691470; Mon, 25 Jul 2016 09:38:11 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.46.1.35 with SMTP id 35ls686697ljb.21.gmail; Mon, 25 Jul 2016 09:38:10 -0700 (PDT) X-Received: by 10.46.0.39 with SMTP id 39mr7712434lja.48.1469464690203; Mon, 25 Jul 2016 09:38:10 -0700 (PDT) Original-Received: from mail-lf0-x229.google.com (mail-lf0-x229.google.com. [2a00:1450:4010:c07::229]) by mx.google.com with ESMTPS id i68si15051260lfe.421.2016.07.25.09.38.10 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 25 Jul 2016 09:38:10 -0700 (PDT) Received-SPF: pass (google.com: domain of via.usov@gmail.com designates 2a00:1450:4010:c07::229 as permitted sender) client-ip=2a00:1450:4010:c07::229; Original-Received: by mail-lf0-x229.google.com with SMTP id l69so132340681lfg.1 for ; Mon, 25 Jul 2016 09:38:10 -0700 (PDT) X-Received: by 10.25.15.194 with SMTP id 63mr6756242lfp.126.1469464690012; Mon, 25 Jul 2016 09:38:10 -0700 (PDT) Original-Received: by 10.25.214.164 with HTTP; Mon, 25 Jul 2016 09:38:08 -0700 (PDT) In-Reply-To: X-Original-Sender: via.usov@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com; spf=pass (google.com: domain of via.usov@gmail.com designates 2a00:1450:4010:c07::229 as permitted sender) smtp.mailfrom=via.usov@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:27253 Archived-At: --001a113fb874dbb6450538786851 Content-Type: text/plain; charset=UTF-8 On Mon, Jul 25, 2016 at 6:19 PM, Viacheslav Usov wrote: > Since one can already use the comma operator to have multiple expressions in the iteration statement, you probably meant "multi-statement". In which case it should support control structures, and things go crazy very quickly from then on. And, in fact, this is something that one can already do in modern C++: for (int i = 0; i < 5; [&]{ if (i == 0) i = 2; else ++i; }()) printf("%d\n", i); I generally find the idiom [&]{ /* something */ }() very useful, to the point that I'd like to have some less ugly syntax for it, for example [{ /* something */ }]. Cheers, V. -- 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/CAA7YVg3v%3D-_D-oR5uvXRjJHGWgvd6VmrPPH7O1cvWCgHJ9%2B_ZA%40mail.gmail.com. --001a113fb874dbb6450538786851 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On M= on, Jul 25, 2016 at 6:19 PM, Viacheslav Usov <via.usov@gmail.com>= wrote:

> Since one can already use the co= mma operator to have multiple expressions in the iteration statement, you p= robably meant "multi-statement". In which case it should support = control structures, and things go crazy very quickly from then on.

And, in fact, this is something that one can already do in= modern C++:

for (int i =3D 0; i < 5; [&]{ if (i =3D=3D 0) i = =3D 2; else ++i; }())
= printf("%d\n", i);

I gene= rally find the idiom [&]{ /* something */ }() very useful, to the point= that I'd like to have some less ugly syntax for it, for example [{ /* = something */ }].

Cheers,
V.
<= /div>

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