220 29440 article Path: news.gmane.org!.POSTED!not-for-mail From: "'Matt Calabrese' via ISO C++ Standard - Future Proposals" Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Allowing string literals to match `char...` packs in templates Date: Thu, 17 Nov 2016 10:14:11 -0500 Lines: 23 Approved: news@gmane.org Message-ID: References: <9de07b5f-f870-4a02-882f-54f9fdd12ffd@isocpp.org> <6b73bf50-4189-4d5d-a2c0-2debb085659e@isocpp.org> <10914b55-c188-4573-a4c7-ba686f213a38@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1479395656 12821 195.159.176.226 (17 Nov 2016 15:14:16 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 17 Nov 2016 15:14:16 +0000 (UTC) To: "ISO C++ Standard - Future Proposals" Original-X-From: std-proposals+bncBCGNLO5F34OBBRESW7AQKGQEMI46F6A@isocpp.org Thu Nov 17 16:14:12 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qk0-f198.google.com ([209.85.220.198]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1c7OOA-00022S-Dg for gclcip-std-proposals@m.gmane.org; Thu, 17 Nov 2016 16:14:10 +0100 Original-Received: by mail-qk0-f198.google.com with SMTP id y205sf180134530qkb.4 for ; Thu, 17 Nov 2016 07:14:14 -0800 (PST) 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 :content-transfer-encoding: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=Kg2dy4qdZrYjG6YAFVsDruXl7jEoEX4nRcZuNSMrheQ=; b=qQ8WOXs7sWTXgoXzEdsPZ/T0E1YFldLMZhwEYurHrVHqvL/5cAkHks5qw1GB63mBYU s7c1e8MiQ8TMTqw0e6R8jjkkkDs+PIg8G57ms/3XyiR/k+AmxzdvDTaQg3mqFxsF97g7 mKG3TpXksntgTKmXrUxDIGLff7glcSP/wJNjOLzIw0HwxF+eZLb2K0ki9t3wG+QNyxqQ n1AUtDks95X6C1JF7FnkQLz+gCoRDCY2go8zAq6iSLskJaTbmDwr8+PbJkgWJMLrRqSE O/3bahy5rB7ehA1qUcgkRvM6IG9fV0Bk+Xg57QcXhXWyEoMu1PeN4SM2sQNzIUBEhEeE QjpA== 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:content-transfer-encoding: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=Kg2dy4qdZrYjG6YAFVsDruXl7jEoEX4nRcZuNSMrheQ=; b=EIZxqoXmXI5JV35vgHa6PzSezHlqJUrpXM5cniCCbdE4JqQP7UQ82zfHNwoH6gbYjq XFYjfCeezh0XPwq8C97QEF8ylf1rsYjbKHLU7ReaIeUHF9617gHLe1awbp+uUeNRlXJA S3uQ2pQkPudPnWrAqx9x9vbklEpmtNnImLlnd8Lkv3YP04OxkLiC1Q2LBe+mhe2FX7p0 evlyHdRhySGGm15Ww76bNxJjnio2rRa3TnFecKcS5zM689NOKtQxd1Kjrq9zmPpKduhG Cle3tBX1VG66s7F2CW5fXYObrke8UTdU4/ZO8yGf0jhnw4up83X35l/hW0g0e1ZWbB93 RMG X-Gm-Message-State: ABUngvdLgKstUHcayAciX0ZmdzaftYcUL+qMPs3oU6fDNPs1RE+oib/0TcFTJ7JprXU0ww== X-Received: by 10.129.112.67 with SMTP id l64mr1213787ywc.20.1479395653573; Thu, 17 Nov 2016 07:14:13 -0800 (PST) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.157.29.137 with SMTP id y9ls4244360otd.39.gmail; Thu, 17 Nov 2016 07:14:12 -0800 (PST) X-Received: by 10.159.49.22 with SMTP id m22mr2112684uab.72.1479395652628; Thu, 17 Nov 2016 07:14:12 -0800 (PST) Original-Received: from mail-vk0-x230.google.com (mail-vk0-x230.google.com. [2607:f8b0:400c:c05::230]) by mx.google.com with ESMTPS id f10si737428uaf.137.2016.11.17.07.14.12 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 17 Nov 2016 07:14:12 -0800 (PST) Received-SPF: pass (google.com: domain of calabrese@google.com designates 2607:f8b0:400c:c05::230 as permitted sender) client-ip=2607:f8b0:400c:c05::230; Original-Received: by mail-vk0-x230.google.com with SMTP id 137so144386454vkl.0 for ; Thu, 17 Nov 2016 07:14:12 -0800 (PST) X-Received: by 10.31.135.199 with SMTP id j190mr2048049vkd.62.1479395652096; Thu, 17 Nov 2016 07:14:12 -0800 (PST) Original-Received: by 10.103.89.209 with HTTP; Thu, 17 Nov 2016 07:14:11 -0800 (PST) In-Reply-To: X-Original-Sender: calabrese@google.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@google.com; spf=pass (google.com: domain of calabrese@google.com designates 2607:f8b0:400c:c05::230 as permitted sender) smtp.mailfrom=calabrese@google.com; dmarc=pass (p=REJECT dis=NONE) header.from=google.com X-Original-From: Matt Calabrese 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:29440 Archived-At: On Thu, Nov 17, 2016 at 3:13 AM, Jonathan M=C3=BCller wrote: > Sorry if I'm asking the obvious question here: Why not guarantee that > different string literals have different addresses and the same string > literal has the same address and use const char* as non-type template > parameters? Ville and Louis already covered a couple of reasons why this won't work, but yet another is that not all string template arguments come directly from literals. It's entirely possible that such strings will be the result of compile-time string manipulations (and I predict that this may even end up being fairly common, given metaprogramming). --=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. To view this discussion on the web visit https://groups.google.com/a/isocpp= ..org/d/msgid/std-proposals/CANh8DEkmUOnyBvC2%3Dz1eETFq%2BBjAax15mAVaAP%3DF1= GbVCHgtGg%40mail.gmail.com. .