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Re: [Scheme-reports] digit-value
Alaric Snell-Pym scripsit:
> >> char-numeric? certainly seems to be of limited use without it, but
> >> is the char-numeric?/digit-value pair actually useful at all in the
> >> scope of WG1, given string->number?
> > Unless we are to extend `string->number` to handle non-European
> > digits (and then `read`, and then numeric literals?), I think so.
> Well, if digit-value exists and handles all those fun cases, then I
> think that read (and, therefore by definition, numeric literals), should
> do so too for consistency and to avoid having to have two parallel
> digit->number conversions lurking inside every implementation, one a
> subset of the other.
It doesn't. Digit-value handles a single character only; string->number
handles a string, as its name indicates. A trivial implementation of
digit-value can be found at http://trac.sacrideo.us/wg/ticket/220 .
As noted there, digit-char-p is the CL equivalent of char-numeric? and
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made of B or vice versa. All mass http://www.ccil.org/~cowan
is interaction. --Richard Feynman
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