> > Map depends on keys to be ordered. This in turn requires to allow for a
> > user-defined order: assume sets as keys that are implemented by
> > unordered lists. Different lists can represent the same set. Hence, it
> > must be possible to provide a user-defined order that would treat those
> > lists as equal. The functor argument of Map contains the compare() which
> > does just that.
>
> The order function could just as easily be passed as a parameter to all
> functions working on the map. There is no reason not to have a
> polymorphic version of the Map module in the standard library. Am I
> wrong in believing that someone out there wrote such a module already?
>
> Alex

There is one : module PMap , which is part of the ExtLib CVS :
http://sourceforge.net/projects/ocaml-lib
Since it's been added recently, there is no mli yet.

Nicolas Cannasse

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