Raffael Cavallaro <[EMAIL PROTECTED]'espam-s'il-vous-plait-mac.com> writes:
> On 2006-06-14 16:36:52 -0400, Pascal Bourguignon <[EMAIL PROTECTED]> said:
>
> > In lisp, all lists are homogenous: lists of T.
>
> CL-USER 123 > (loop for elt in (list #\c 1 2.0d0 (/ 2 3)) collect
> (type-of elt))
> (CHARACTER FIXNUM DOUBLE-FLOAT RATIO)
>
> i.e., "heterogenous" in the common lisp sense: having different
> dynamic types, not in the H-M sense in which all lisp values are of
> the single union type T.
What's the difference? Dynamically types values _are_ all members of
a single tagged union type. The main difference is that the tages
aren't always visible and that there are only a fixed, predefined
number of them.
Torben
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