[boost] Re: Formal Review: The Spirit Parser Framework.

From: Nuno Lucas (depdev.sdi_at_[hidden])
Date: 2002-10-22 13:49:13

> Hartmut Kaiser wrote:
> > > After what your code looks like:
> > >
> > >     nonctl_char = urange_p( '\x21', '\xFF' );

Yes, this would be better (less ugly).

>> Peter Dimov wrote:
> > The question is, would you ever want ['\x21', '\xFF'] to
> > _not_ be a valid
> > range?
> 
> If this is what you want, you could write 'epsilon_p - urange_p( '\x21',
> '\xFF' )', essentially this means 'match everything (epsilon_p) except
> ('-') the given range :-)
>

If I interpreted right, Peter also concedes me some reason.
I know this is a problem that has to do with the history of the C 
language. To differentiate bytes (unsigned chars) from chars (signed) 
we know have situations where the order of the alphabet can be 
incoherent with the order of the ordinal representation.
I sincerely don't have a clue on how to solve this problem in a simple 
and easy way (without partial specialization), so maybe I'm just being 
too picky.

Regards,
  ~Nuno Lucas

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