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Subject: Re: [boost] Review Request: Boost.Locale
From: Artyom (artyomtnk_at_[hidden])
Date: 2010-05-24 15:15:01

> > Well, that's not exactly true. mbstate_t is defined by the > C standard, and indeed, it says pretty much nothing about > its nature, except that it's not an array. But on any > platform I worked with (including Windows) it's an integer. Ö¹Under Linux it is structure and AFAIK gcc uses iconv for conversion. So I'm not sure how safe is to write anything to it. > I think, it is perfectly fair to assume that it is at least > a POD and sizeof(mbstate_t) >= 1, which makes it possible > to store information about surrogate pairs in it. > > The C++ standard does give some hints regarding how the > conversion state shall be handled by the stream. In > particular, it specifies that the state will be > value-initialized at the beginning of the conversion, and it > will call `shift` at the end of the conversion in order to > finalize the converted character sequence and return the > state to its initial value. > > Not that it makes it easier to use mbstate_t with UCI under > the hood, but it seems possible (theoretically, at least) to > implement the complete UTF-16 <-> char conversion with > it. > I was thinking about it but unfortunately standard does not specify how mbstate_t initialized. If I could assume that it is at leaset POD filled with zeros I could do something but I actually can't. At least I didn't find any reference for this.

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