220 29106 <1314a997-2f74-4b52-9755-bc9d1deb6982@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: "T. C." Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Removing trivial undefined behaviour Date: Wed, 26 Oct 2016 08:34:06 -0700 (PDT) Lines: 120 Approved: news@gmane.org Message-ID: <1314a997-2f74-4b52-9755-bc9d1deb6982@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_1058_1732431302.1477496046887" X-Trace: blaine.gmane.org 1477496076 550 195.159.176.226 (26 Oct 2016 15:34:36 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 26 Oct 2016 15:34:36 +0000 (UTC) To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBCQ43G7NQIIRB4EZYPAAKGQEXLB4ZHY@isocpp.org Wed Oct 26 17:34:31 2016 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-yw0-f198.google.com ([209.85.161.198]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1bzQDQ-0005oz-1R for gclcip-std-proposals@m.gmane.org; Wed, 26 Oct 2016 17:34:08 +0200 Original-Received: by mail-yw0-f198.google.com with SMTP id o2sf12385145ywo.0 for ; Wed, 26 Oct 2016 08:34:10 -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=qBWMyj0CQ0Q9jIC6xRDDP1wh+hKlDXR71jTsIYF0g1U=; b=NT4HDGhoFz0++2Xv74afDyP6oigYyagUgWvyEOb+HdbDZwq5DbGsiRbwnTIgBWut9P SLKBMbEbhdOSpvAD1oKwApjrYCNKk350ydet0h8PxgenSzpDRiXN12W3hu0mwBx4stuC ktTArihulIPjkLVF7PVbj6u3y8TJs+yFIGfhnxK6OoRHTmCUO+AC8wzmjuublO4UcK5Z e37mpmvphawExNcu4nqr+hPgwVmN8vf0PDRJ3AW5ZHXZQRH6OeuyK8MMhDlGOy0xakrF hIjeLznMfM7+wBx7oevkY1jpzLUTszuVGXjBAsoCP7UeBVOhWH9WhFJz0soeb0jdqWz/ tWPw== 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=qBWMyj0CQ0Q9jIC6xRDDP1wh+hKlDXR71jTsIYF0g1U=; b=VXZF+uXfXRIgvFRQLlrxLY/9XpDnwpsHoRdXT7GmJAJg4vsSn3E1XqesWMVhX1TBPp BlK9hmK3Pz1qx6+DfB+56qROpHrxIs5J2c9oitU0HmBv90u3nRej3QLy3rGsXJvynqWb dRA1+3+e82/8YvUc9hZxbFdNhD4CZsjDF7TEvOJnp1OAKg1diSollqKYzJfw737rtW6m gUF+Hma6sSgrJQnlCamxJe7jFTpeB/FU5hCzidOXwj4vePkx5mljDJ/6IMd+nbCJ1ELT UYAGO5ULhRZnGjJKzYNAYkxGNrb5/Wf17YKLSQbvQ8vLE6fwKlN7h5fp//2WgKSW6Ih1 OPxw== 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=qBWMyj0CQ0Q9jIC6xRDDP1wh+hKlDXR71jTsIYF0g1U=; b=W/+tXUn+4XakLmWciWtg4wFmgAqciguIahe72I5SrXe7/jn7PAnfbFGIQgxHlgCa2t GRpJAPDXCru7yss/mitSGH+1SMUVFz+kPfyOQSp8skJT8uRxR4RwBiNYXfkorIb2qAWZ fmgL7frU41aC8VJfcgh5XS2gtypt7Omz/KcmzOZ+DuJyXNb6XkWXvMGmau4H3YLD850l 1QYpksTgHElfSrVzTLUITJ4O9gUxRSlf2NfzOzEfdz15rS2uv9UBV4yscoT0Fi+GMRVy UWWILlqAxuKeEYz0Gz0On0iEbbthoMNVKNB7aQbE25FE7vE4BjuJKvCUm0+3GpXFuYFK oe9g== X-Gm-Message-State: ABUngvcTP8OU9L/JXk8Ntm+Zu93UWs5bRRAego5JnHZkZDtD9qKCot9trwVXFJE4ttI23w== X-Received: by 10.129.81.144 with SMTP id f138mr930894ywb.131.1477496050451; Wed, 26 Oct 2016 08:34:10 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.36.17.85 with SMTP id 82ls602166itf.2.gmail; Wed, 26 Oct 2016 08:34:08 -0700 (PDT) X-Received: by 10.36.116.130 with SMTP id o124mr600092itc.10.1477496048395; Wed, 26 Oct 2016 08:34:08 -0700 (PDT) In-Reply-To: X-Original-Sender: rs2740@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:29106 Archived-At: ------=_Part_1058_1732431302.1477496046887 Content-Type: multipart/alternative; boundary="----=_Part_1059_2124183137.1477496046887" ------=_Part_1059_2124183137.1477496046887 Content-Type: text/plain; charset=UTF-8 On Wednesday, October 26, 2016 at 9:19:15 AM UTC-4, Tony V E wrote: > > > > On Wed, Oct 26, 2016 at 4:28 AM, T. C. > > wrote: > >> >> >> On Wednesday, October 26, 2016 at 3:20:55 AM UTC-4, 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. >>> >>> >>> >> The reason they take int is because they also accept EOF. That's C's >> style, for better or worse. >> >> In any event, there's no way in hell C++ is going to change this. It's a >> massive C compatibility break. >> > > We could maybe overload the function: > > int isdigit(int c); > bool isdigit(char c); > > No idea if that is a good idea. > >> >> -- > Be seeing you, > Tony > That breaks anything that expects ::isdigit to be unambiguous (e.g., pass it to an algorithm). -- 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/1314a997-2f74-4b52-9755-bc9d1deb6982%40isocpp.org. ------=_Part_1059_2124183137.1477496046887 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable


On Wednesday, October 26, 2016 at 9:19:15 AM UTC-4= , Tony V E wrote:


On Wed, Oct 26, 2016 at 4:28 AM= , T. C. <rs2...@gmail.com> wrote:


On Wednesday, October= 26, 2016 at 3:20:55 AM UTC-4, 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((unsi= gned char) c).
=C2=A0
Great, in that= case I'm sure there is no opposition to changing the signature to refl= ect this requirement? It's a much cleaner solution than requiring a cas= t in every invocation, after all.


=
The reason they take int is because they also accept = EOF. That's C's style, for better or worse.

In any event, there's no way in hell C++ is going to change this. It&= #39;s a massive C compatibility break.

We could maybe overload the function:

int isdigit= (int c);
bool isdigit(char c);

No idea if t= hat is a good idea.


--
Be s= eeing you,
Tony

<= /div>
That breaks anything that expects ::isdigit=C2=A0to be unambiguou= s (e.g., pass it to an algorithm).=C2=A0

--
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