Waldek Hebisch <[EMAIL PROTECTED]> writes:
> Well, concat version creates intermediate lists and concatenates them.
> Psychologically double iteration is an atomic operation, so it is
> easier (at least for some folks) to think about.
OK. I'd still prefer to keep the language simple. What I would like a lot
however is something like
for e in g repeat
(a, b) := e
...
or even
for (a, b) in g repeat
...
given that g returns a Cross.
> Once you have generator iteration is easy (but may be inefficient).
There is a long thread "generators in lisp" in comp.lang.lisp 2004, but I
didn't read it yet. Maybe that would help?
(But I hurry to stress that having generators is not the thing I need most in
SPAD. Most important to me would still be types being truly first class
objects.)
Martin
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