Re: Coercing pointers

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Edi Weitz wrote:
> > Do LW not have an :unsigned-char type?
> They have but it behaves like a number, don't know why:

I suppose their justification is their is no concept of an unsigned
character in lisp.

> If you'd modify ENSURE-CHAR-CHARACTER for this case it had to make a
> runtime decision which probably wouldn't be a good idea.

Hmm, what's so bad about
#+lispworks
(defmacro ensure-char-character (obj)
  `(if (characterp ,obj) ,obj (code-char ,obj)))

Just the run-time overhead? I think that I'm happy enough with this on
Lispworks as I don't know of a better way to regularize their
difference of dereferencing a :char and :unsigned-char.

We can still add the deref-char-pointer to provide an optimized
dereferencing returning a lisp character.

--=20
Kevin Rosenberg
kevin-HJRc7zDS/[email protected]

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