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From: | "Carey Evans" <carey DOT evans AT gmail DOT com> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: ctype<char> custom table lookup in C++ |
Date: | 20 May 2005 14:11:40 -0700 |
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To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
Hans-Bernhard Broeker wrote: [...] > I find it hard to believe the C++ would actually predefine the > implemention of a given feature. That's none of their business. Here's the bit of the spec I quoted: http://www.cantrip.org/lib-locales.html#lib.facet.ctype.char.members As far as I can tell, it's defined that way so that the table may be customised in a subclass. There's nothing that says that the table() method has to return __dj_ctype_flags or the equivalent table by default, though; it just has to return some variation that works when the character is cast to unsigned char as an index. In DJGPP's case, this is __dj_ctype_flags + 1. [...] > Only if you misunderstand how that table is supposed to be > constructed, in the case of DJGPP. The C++ standard seems to have > forgotten about the C specialty of passing EOF into a <ctype.h> > library macro/function. The C++ ctype classes don't support passing EOF; valid input values are CHAR_MIN to CHAR_MAX, inclusive. -- Carey Evans
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