`sig
type t
module V : Sig.COMPARABLE
module E :
sig
type t
val compare : t -> t -> int
type vertex = V.t
val src : t -> vertex
val dst : t -> vertex
type label
val create : vertex -> label -> vertex -> t
val label : t -> label
end
val nb_vertex : Flow.G_GOLDBERG.t -> int
val iter_vertex : (V.t -> unit) -> Flow.G_GOLDBERG.t -> unit
val iter_edges_e :
(Flow.G_GOLDBERG.E.t -> unit) -> Flow.G_GOLDBERG.t -> unit
val fold_succ_e :
(Flow.G_GOLDBERG.E.t -> 'a -> 'a) -> Flow.G_GOLDBERG.t -> V.t -> 'a -> 'a
val fold_pred_e :
(Flow.G_GOLDBERG.E.t -> 'a -> 'a) -> Flow.G_GOLDBERG.t -> V.t -> 'a -> 'a
end`