module NSet: sig .. end
type Circuit.node
type 'a t = 'a Node.NSet.t
val create : int -> 'a t
val clear : 'a t -> unit
val copy : 'a t -> 'a t
val remove : 'a t -> key -> unit
val find : 'a t -> key -> 'a
val find_all : 'a t -> key -> 'a list
val replace : 'a t -> key -> 'a -> unit
val mem : 'a t -> key -> bool
val length : 'a t -> int
val add : unit t -> key -> unit
val iter : (key -> unit) -> unit t -> unit
val fold : (key -> 'a -> 'a) -> unit t -> 'a -> 'a
val to_list : unit t -> key list
val sum_map : (key -> int) -> unit t -> int
val sumf_map : (key -> float) -> unit t -> float
val filter : (key -> bool) -> unit t -> unit