220 24846 <3806635.aPURXZCGiZ@tjmaciei-mobl4> article Path: news.gmane.org!not-for-mail From: Thiago Macieira Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: Any purposes for $, @, or ` ? 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[2a01:4f8:d13:f81:21c:14ff:fe01:12a3]) by mx.google.com with ESMTP id z17si27120944qka.125.2016.02.29.11.25.28 for ; Mon, 29 Feb 2016 11:25:28 -0800 (PST) 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-mobl4.localnet (jfdmzpr06-ext.jf.intel.com [134.134.137.75]) by gondolin.macieira.info (Postfix) with ESMTPSA id 9A59411A423 for ; Mon, 29 Feb 2016 11:25:27 -0800 (PST) User-Agent: KMail/5.1.2 (Linux/4.4.2-1-default; KDE/5.19.0; x86_64; ; ) 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 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-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:24846 Archived-At: On segunda-feira, 29 de fevereiro de 2016 19:42:20 PST Bo Persson wrote: > Perhaps the confusion is that a pointer representation doesn't have to > be *only* a memory address. It can be a word address and a part-word index. > > That way you can access each byte, even if there are several bytes > stored in one addressable unit. > > Once upon a time, I used such hardware. Or, put it another way, you're doing byte addressing :-) Like you said, in such a hardware, a C++ pointer would be larger than the pointer the HW actually needs. But with that technique, we can address each individual byte in the word address. Conclusion: byte addressing. We don't care how the pointers are represented or what the hardware architects may have called "word" or "byte". We have our own definition of byte, which is that it's the smallest storage unit that can be individually and uniquely addressed. Since C++14, that unit needs to be at least 8 bits. -- 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/3806635.aPURXZCGiZ%40tjmaciei-mobl4. .