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Subject: Re: ctype<char> custom table lookup in C++
References: <1116546092 DOT 867392 DOT 97940 AT g43g2000cwa DOT googlegroups DOT com> <3f5juoF5og3rU2 AT news DOT dfncis DOT de>
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Date: Fri, 20 May 2005 14:22:46 GMT
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To: djgpp AT delorie DOT com
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Hans-Bernhard Broeker wrote:
> Carey Evans <carey DOT evans AT gmail DOT com> wrote:
> 
... snip ...
> 
> I find it hard to believe the C++ would actually predefine the
> implemention of a given feature.  That's none of their business.
> 
>> but with GCC 3.4.3 in DJGPP, it returns (from ctype_inline.h):
> 
>>> _M_table[static_cast<unsigned char>(__c + 1)] & __m;
> 
>> which means that all the character classifications in my custom
>> class are off by one.
> 
> 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.

Bear in mind that that uses the hidden assumption that EOF == -1.

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