>  > 	Also, is there a particular reason Map is so, um, inaccessible to 
>  > beginners?  Hashtbl's generic interface is much more inviting than 
>  > Map's functorial-only interface, especially to those not terribly 
>  > familiar with the module system.
> 
> Just   copy  the  body   of  Map.Make   and  replace   Ord.compare  by
> Pervasives.compare  and you'll get  a polymorphic  version of  Map, as
> easy to use as Hashtbl's generic interface.
> 
> But I agree: it's a shame ocaml does not provide it.

Thanks for the idea.  Here is the modified code:

  http://redwood.ucdavis.edu/~issac/map2.tar.gz

# #load "map2.cmo";;
# let map = ref Map2.empty;;
val map : ('_a, '_b) Map2.t ref = {contents = <abstr>}
# map := Map2.add "foo" 23 !map;;
- : unit = ()
# map := Map2.add "bar" 42 !map;;
- : unit = ()
# Map2.iter (fun key v -> Printf.printf "%s : %i\n" key v) !map;;
bar : 42
foo : 23
- : unit = ()

-- 
Issac Trotts

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