220 41106 <26165210.kvzUkpVNyP@tjmaciei-mobl1> article Path: news.gmane.org!.POSTED!not-for-mail From: Thiago Macieira Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: signed char is not treated as char and unsigned char Date: Wed, 28 Nov 2018 14:21:14 -0800 Lines: 23 Approved: news@gmane.org Message-ID: <26165210.kvzUkpVNyP@tjmaciei-mobl1> References: 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 1543443555 26812 195.159.176.226 (28 Nov 2018 22:19:15 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 28 Nov 2018 22:19:15 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBCB4TK757YBRBYFJ7TPQKGQEJLL6QZQ@isocpp.org Wed Nov 28 23:19:11 2018 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-qk1-f200.google.com ([209.85.222.200]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gS8Ao-0006rL-QN for gclcip-std-proposals@m.gmane.org; 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[2001:19f0:5:2221::1:3]) by mx.google.com with ESMTPS id k34si1252752qtf.286.2018.11.28.14.21.20 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 28 Nov 2018 14:21:20 -0800 (PST) Received-SPF: pass (google.com: domain of thiago@macieira.org designates 2001:19f0:5:2221::1:3 as permitted sender) client-ip=2001:19f0:5:2221::1:3; Original-Received: from tjmaciei-mobl1.localnet (unknown [134.134.139.82]) by smtp.macieira.info (Postfix) with ESMTPSA id 0431C1E68D for ; Wed, 28 Nov 2018 14:21:18 -0800 (PST) In-Reply-To: X-Original-Sender: thiago@macieira.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of thiago@macieira.org designates 2001:19f0:5:2221::1:3 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-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:41106 Archived-At: On Wednesday, 28 November 2018 10:46:00 PST riadwaw@gmail.com wrote: > I noticed, that in several places in the standard, e.g in [basic.types], > char, unsigned char, or std::byte are mentioned separately (basically as > types that types that can alias anything else from my understanding). > There's no signed char in the list, despite it's a separate type. > What may be a reason for that? Because it's signed. As a signed integer, there could be bit patterns that don't form valid, unique values. For example, in one's complement, 0x00 and 0xFF are both zero -- 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/26165210.kvzUkpVNyP%40tjmaciei-mobl1. .