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Subject: Re: [boost] [General] Always treat std::strings as UTF-8
From: Artyom (artyomtnk_at_[hidden])
Date: 2011-01-15 04:25:04

> From: Patrick Horgan <phorgan1_at_[hidden]> > On 01/14/2011 02:05 PM, Peter Dimov wrote: > > John B. Turpish wrote: > > > By the way, I disagree with Peter's assessment that, "you rarely, if ever, > > > need to access the Nth character," but I will gladly cede that > > > this depends on your problem domain. > > > > It obviously depends on the problem domain :-) but, when > > talking about Unicode, you can't reliably access the Nth character, > > in general, even with UCS-32. (As far as I know.) > > I don't understand. UCS-32 (I assume you meant encoded as UTF-32) > is a fixed width encoding so the n-th character is just > 4n away from the beginning of the string. Right? No, Nth Unicode code-point is at nth position not a character. For example in word "שָלוֹם" as 4 characters "שָ"‎, "ל"‎, "וֹ"‎, "ם"‎ and 6 code points: ש‎ ָ‎ ל‎ ו‎ ֹ‎ מ Where two code points are diacritic marks. Boost.Locale has special character iterator to handle characters for this purpose and it works on characters and not code points. See: Artyom

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