220 29086 <5de60c76-a73b-4d29-bea5-a9eed19f4c67@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: mihailnajdenov@gmail.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Removing trivial undefined behaviour Date: Wed, 26 Oct 2016 01:26:24 -0700 (PDT) Lines: 73 Approved: news@gmane.org Message-ID: <5de60c76-a73b-4d29-bea5-a9eed19f4c67@isocpp.org> References: <35daf87a-bf1d-46de-b16c-c2965fbadc8f@isocpp.org> <9e242562-aba1-4f8d-8e0a-b2de34f6a10b@isocpp.org> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_1210_159454386.1477470384343" X-Trace: blaine.gmane.org 1477470396 23635 195.159.176.226 (26 Oct 2016 08:26:36 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 26 Oct 2016 08:26:36 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCUJ3A7GRAPRBMORYHAAKGQE7OBAGAA@isocpp.org Wed Oct 26 10:26:32 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-vk0-f69.google.com ([209.85.213.69]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bzJXV-0004d0-RS for gclcip-std-proposals@m.gmane.org; Wed, 26 Oct 2016 10:26:26 +0200 Original-Received: by mail-vk0-f69.google.com with SMTP id 137sf1247912vkl.12 for ; Wed, 26 Oct 2016 01:26:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to: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=Lv+5IGHOZnPZL9ueIKmhxt2csoZEhEzh9hEvxjz1TyM=; b=qBjWNiRVlDMYb0d9D4MgQoVUoRAPxhtrur+x5A6/ylbNi8l3I0zus2m/WqPaEcKcf3 CcOUIlp5ELuqSzC3UFLP1fL1CQKnW0wHpvx8FDRrwHCWD92czVR/sRcnfLr2UC+erqhU 4+xCFR9bSwiTtB7QeEDo56eiaqcTcallceMnqhJtJpTuvUPe9qu4MtcynK3lpOcqCpDn 8giW6bBXxDj57H6AyxWd6LJUqyXTEXwR7Hb7ANoXtwygtV5GBJXbKDi064ZQ9JpnhT/M Hzs4AhwWX2lXPLjuu+7zXe4FyWTCwq1vIMKIc0hLcwlOBrmrgxm5BDK/NfMbVZWpcyO+ syNg== 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 :x-spam-checked-in-group:list-post:list-help:list-archive :list-subscribe:list-unsubscribe; bh=Lv+5IGHOZnPZL9ueIKmhxt2csoZEhEzh9hEvxjz1TyM=; b=yVycyc+WpFv+ZLgr78gCu69/+N1/pQs01FakMNPnS9ms5hagXTAI99xqb5msqfYQps Vky1LpoHGQ9AIZrjxhMa9+mpb6Pz6FqTjhkceWQDarf/ShXIlH+3XIfwrhHborAKMsCR /NRqG3MpLq1vhgS+eBWtAHhw8TYmmJJ4PApiRu+oIfEeedrDxjgi9HAVPaxUS434YQVD m2y2gWlH6oCONMPmjRQodEnB3RVL4CtUF8o7C3JoIfyrALWdV3PYUGCn9544OvsKKU3o htM4C9i776i3Q7wgeHZQIgJ3bskVJZkaphDJ6cDxfcEznziYj2AT1Q4iwWEzERVRmZRK +wwA== 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: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=Lv+5IGHOZnPZL9ueIKmhxt2csoZEhEzh9hEvxjz1TyM=; b=YHJABW+oOUGDFClUjfmw+13g90pF8MVH/mGUTVP1z+AQRH6Pg6q2u+BS2NNbL/tVbT dVPOJpfWYbWLNkb10wuuXoEWNUPMVwPnDbppeDJqShBHoDxTW0GZtW2zNXv57PnRANtT XXSCRgzlg0AF65PRqH1/5S4lNIlT15kzgi7/7nPVzdntjpI12m1h2R06bn0cFrmIvYBa XiTImq6QX+KIsWjji7AR+ZGOr6iNM36as4m3V+hdK9vxwl7oFeuHyrfrorYSQ4rAdrDZ OAhh5dnkkdHBeqsT6XZPVROKLS92qI1KK8fsDfFM/3AwcMr+cudQdi5UrIwkGSnWCu+D SWGQ== X-Gm-Message-State: ABUngvdcXuUUgw5UO4I76LEc9STNGaM0T2HZAbMFe7t733RQHUWrHeYv4G+Jp+oVhOeMOQ== X-Received: by 10.31.208.199 with SMTP id h190mr107131vkg.9.1477470388100; Wed, 26 Oct 2016 01:26:28 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.107.19.200 with SMTP id 69ls302418iot.4.gmail; Wed, 26 Oct 2016 01:26:25 -0700 (PDT) X-Received: by 10.36.127.205 with SMTP id r196mr43347itc.4.1477470385415; Wed, 26 Oct 2016 01:26:25 -0700 (PDT) In-Reply-To: X-Original-Sender: MihailNajdenov@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:29086 Archived-At: ------=_Part_1210_159454386.1477470384343 Content-Type: multipart/alternative; boundary="----=_Part_1211_2094825598.1477470384343" ------=_Part_1211_2094825598.1477470384343 Content-Type: text/plain; charset=UTF-8 On Wednesday, October 26, 2016 at 10:20:55 AM UTC+3, Hans Guijt wrote: > > > On Wednesday, October 26, 2016 at 9:11:26 AM UTC+2, T. C. wrote: >> >> >> Because they are meant to be used as isdigit((unsigned char) c). >> > > Great, in that case I'm sure there is no opposition to changing the > signature to reflect this requirement? It's a much cleaner solution than > requiring a cast in every invocation, after all. > But, this is a C function, C++ can't change it like that. C++ has an alternative - the one with the locale. Granted, it throws when the input is non-char, but it is not an UB. -- 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/5de60c76-a73b-4d29-bea5-a9eed19f4c67%40isocpp.org. ------=_Part_1211_2094825598.1477470384343 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable


On Wednesday, October 26, 2016 at 10:20:55 AM UTC+= 3, Hans Guijt wrote:

On Wednesday, October 26, 2016 at 9:11:26 AM UTC+2, T. C. wrot= e:

<= div>Because they are meant to be used as isdigit((unsigned char) c).
<= /div>
=C2=A0
Great, in that case I'm sure th= ere is no opposition to changing the signature to reflect this requirement?= It's a much cleaner solution than requiring a cast in every invocation= , after all.

But, this is a= =C2=A0C function, C++ can't change it like that.

<= div>C++ has an alternative - the one with the locale.
Granted, i= t throws when the input is non-char, but it is not an UB.=C2=A0

--
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