module ID : sig
(** [t] is a ID within a range *)
type t
val create : int -> t
(** [create num] is an ID [t] *)
val incr : t -> t
(** [incr id] is the next [id] in the sequence *)
val to_string : t -> string
(** [to_string id] is an string representation of [id] *)
val pp : t -> string
(** [pp id] is a pretty string representing [id] *)
end