# Module type Map.OrderedType

    module type OrderedType : sig ... end

Input signature of the functor `Map.Make`.

`type t`
The type of the map keys.

    val compare : t -> t -> int

A total ordering function over the keys. This is a two-argument function `f` such that `f e1 e2` is zero if the keys `e1` and `e2` are equal, `f e1 e2` is strictly negative if `e1` is smaller than `e2`, and `f e1 e2` is strictly positive if `e1` is greater than `e2`. Example: a suitable ordering function is the generic structural comparison function `Pervasives.compare`.