> 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


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