On Wed, Apr 24, 2002 at 04:55:29PM +1000, John Max Skaller wrote:
> How to compare recursive types?

You should definitively read "Recursive Subtyping Revealed" by
Vladimir Gapeyev, Michael Levin, and Benjamin Pierce.
(Available from http://www.cis.upenn.edu/~bcpierce/papers/index.html)

If you are only interested in equality, you can use the same algorithm
as for subtyping (equality is a preorder).  The complexity of this
algorithm can be improved from quadratic to (almost) linear by
exploiting the fact that type equality is an equivalence relation: the
algorithm uses a set of pairs of already encountered types, but you
can use a union-find datastructure instead.

-- Jerome
-------------------
To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr
Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/
Beginner's list: http://groups.yahoo.com/group/ocaml_beginners