Module Useful

module Useful: sig .. end

Useful functions, modules and types

val bool_of_opt : 'a option -> bool
module StrMap: Map.S  with type key = string
module StrSet: Set.S  with type elt = string
module IntMap: Map.S  with type key = int
module IntSet: Set.S  with type elt = int
type 'a fprintf = Format.formatter -> 'a -> unit 
module type ORD_PRT = sig .. end