220 29170 <1612025.rPhQNZgPHV@tjmaciei-mobl1> article Path: news.gmane.org!.POSTED!not-for-mail From: Thiago Macieira Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Removing trivial undefined behaviour Date: Thu, 27 Oct 2016 14:40:37 -0700 Lines: 23 Approved: news@gmane.org Message-ID: <1612025.rPhQNZgPHV@tjmaciei-mobl1> References: <35daf87a-bf1d-46de-b16c-c2965fbadc8f@isocpp.org> <1314a997-2f74-4b52-9755-bc9d1deb6982@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 X-Trace: blaine.gmane.org 1477604452 15840 195.159.176.226 (27 Oct 2016 21:40:52 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 27 Oct 2016 21:40:52 +0000 (UTC) User-Agent: KMail/5.3.2 (Linux/4.8.3-1-default; KDE/5.26.0; x86_64; ; ) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCB4TK757YBRBWHIZHAAKGQEINRKWQY@isocpp.org Thu Oct 27 23:40:46 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-wm0-f71.google.com ([74.125.82.71]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bzsPd-0002LO-Qg for gclcip-std-proposals@m.gmane.org; Thu, 27 Oct 2016 23:40:37 +0200 Original-Received: by mail-wm0-f71.google.com with SMTP id 79sf18226067wmy.6 for ; Thu, 27 Oct 2016 14:40:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=from:to:subject:date:message-id:user-agent:in-reply-to:references :mime-version: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=mqDoJmm3OhmKkPlBEZZ2G3xMBcy4DD7dWLYfb9ajwBg=; b=ChBO+AmBjczCtUThkNYpsPRhB57D5rK94orImtuG5behkC1OOPxAQM4NbXcw6izQ1+ VTdu45XturcrNTXQWj91JSbbNg//76lA5r3Je5oH0yVbACU+rNo3izNSkg8VLptiMGDJ /pnuHaPGGVYAMPSKQ+KX3uvHROHsPP5bglS9qpTsNNaQQm+LwFUMZlSUvMAfMVuZViAQ AOhCFrJWad8OlR99pTHpO7GbSZiCvNDq07Et3JobTM83Ov36za2679POEElP8AEvV6NF hq/zieWSAQ9ZmZBBnWj7XdHHIKG6ydN/z2sk+MHsmBM3cn3YA2+XzCOYqSwxVk4qjOuE n/VQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:subject:date:message-id:user-agent :in-reply-to:references:mime-version: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=mqDoJmm3OhmKkPlBEZZ2G3xMBcy4DD7dWLYfb9ajwBg=; b=cuHnaS4CH+4REoD2VhhaNTwrVpPLjdsCjvxfWqlC4mGnuDN3xGiSvBxl76EQ5pulOV tmbInoBaf05yMgHIQ89vF3pB3MSnOajLYAxogjKjp8lW2Hj6bKX5QiDurDHmzCWY7E9n D2qgPuCAZ88bJ3IQA0uh+vtLeDg47cErEnDg6YLhozqGxlo1xkXZSZHe2+6pfDwinjXP euGsB9VGuoTz8m7zUsDp94OwT6ik1eiBWxMkjmoHhqs31t6wznasjX6OfcPwU80mRzdP 6+n5pEjZi2kCSInfiZ2z9zmqePoxhK0bUKYq96zfmeKbgKPczDTPOPSbKlhevPD/yHL6 A6zQ== X-Gm-Message-State: ABUngvdtqGNqFq4AcTCu76mBfNzJLYKBbtRhUQGRO9Z3kU4HVCXb1jkXIdy5b+pCkjVA+g== X-Received: by 10.28.20.7 with SMTP id 7mr39811wmu.11.1477604440634; Thu, 27 Oct 2016 14:40:40 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.28.148.2 with SMTP id w2ls104990wmd.19.gmail; Thu, 27 Oct 2016 14:40:39 -0700 (PDT) X-Received: by 10.28.13.144 with SMTP id 138mr433013wmn.41.1477604439713; Thu, 27 Oct 2016 14:40:39 -0700 (PDT) Original-Received: from gondolin.macieira.info (gondolin.macieira.info. [2a01:4f8:d13:f81:21c:14ff:fe01:12a3]) by mx.google.com with ESMTP id k3si5804975wme.37.2016.10.27.14.40.39 for ; Thu, 27 Oct 2016 14:40:39 -0700 (PDT) Received-SPF: pass (google.com: domain of thiago@macieira.org designates 2a01:4f8:d13:f81:21c:14ff:fe01:12a3 as permitted sender) client-ip=2a01:4f8:d13:f81:21c:14ff:fe01:12a3; Original-Received: from tjmaciei-mobl1.localnet (jfdmzpr02-ext.jf.intel.com [134.134.137.71]) by gondolin.macieira.info (Postfix) with ESMTPSA id 599AF11B376 for ; Thu, 27 Oct 2016 14:40:39 -0700 (PDT) In-Reply-To: <1314a997-2f74-4b52-9755-bc9d1deb6982@isocpp.org> X-Original-Sender: thiago@macieira.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of thiago@macieira.org designates 2a01:4f8:d13:f81:21c:14ff:fe01:12a3 as permitted sender) smtp.mailfrom=thiago@macieira.org 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:29170 Archived-At: On quarta-feira, 26 de outubro de 2016 08:34:06 PDT T. C. wrote: > That breaks anything that expects ::isdigit to be unambiguous (e.g., pass > it to an algorithm). Is it even required to be a function in the first place? Many implementations in C define it to be a macro that reads from an array. Even glibc: # define __isctype(c, type) \ ((*__ctype_b_loc ())[(int) (c)] & (unsigned short int) type) [...] # define isdigit(c) __isctype((c), _ISdigit) Though glibc only does that in C mode, not in C++. -- Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org Software Architect - Intel Open Source Technology Center -- 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/1612025.rPhQNZgPHV%40tjmaciei-mobl1. .