Re: [cffi-devel] Lisp type for word size

In article tcr-C05AC2.17212025102010@news.gmane.org, Tobias C Rittweiler tcr@freebits.de wrote:

Does CFFI contain a Lisp type which represents the machine's word size?

I guess it could be defined as

(deftype word-size () `(unsigned-byte ,(* 8 (foreign-type-size :long))))

Are there any caveats? E.g. what about a 32bit Lisp implementation on a 64bit architecture?

Perhaps the type should rather be defined in each backend.

Clarification:

I'm concerned about the 32bit Lisp on 64bit architecture issue, because for my purposes I'd like

(make-pointer (the word-size X))

never signal a type error.

-T.