From: Clark Cox (email@example.com)
Date: Wed Mar 03 2004 - 16:33:27 EST
On Mar 03, 2004, at 14:13, Frank Yung-Fong Tang wrote:
> Clark Cox wrote on 3/3/2004, 1:28 PM:
>> From the C standard:
>> __STDC_ISO_10646_ _An integer constant of the formyyyymmL(for example,
>> 199712L), intended to indicate that values of type wchar_t are the
>> coded representations of the characters defined by ISO/IEC10646, along
>> with all amendments and technical corrigenda as of the specified year
>> and month.
>> This, to me suggests that wchar_t would indeed be a 32-bit type (well,
>> at least a 20-bit type) when this macro is defined. However, to be
>> sure, I'd suggest posting to news:comp.std.c
> The language in the standard does not prevent someone to make it 16
> bits or 64 bits when that macro is defined, right?
Not explicitly, but as I read it, when that macro is defined, wchar_t
would have to be at least 20-bits, or else it couldn't be true that
"values of type wchar_t are the coded representations of the characters
defined by ISO/IEC10646". That is, I would think that wchar_t would
have to be able to represent values in the range [0, 0x10FFFF]. But my
interpretation could be off, which is why I recommended asking on
> And what does the year and month mean?
It indicates which version of ISO10646 is used by the implementation.
In the above example, it indicates whatever version was in effect in
December of 1997.
-- Clark S. Cox III firstname.lastname@example.org http://homepage.mac.com/clarkcox3/ http://homepage.mac.com/clarkcox3/blog/B1196589870/index.html
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