val out_degree : t -> vertex -> intval mem_vertex : t -> vertex -> boolval mem_edge_e : t -> edge -> boolval iter_vertex : (vertex -> unit) -> t -> unitval fold_vertex : (vertex -> 'a -> 'a) -> t -> 'a -> 'aval iter_edges_e : (edge -> unit) -> t -> unitval fold_edges_e : (edge -> 'a -> 'a) -> t -> 'a -> 'aval iter_succ_e : (edge -> unit) -> t -> vertex -> unitval fold_succ_e : (edge -> 'a -> 'a) -> t -> vertex -> 'a -> 'aval iter_pred_e : (edge -> unit) -> t -> vertex -> unitval fold_pred_e : (edge -> 'a -> 'a) -> t -> vertex -> 'a -> 'aval add_edge_e : t -> edge -> tval remove_edge_e : t -> edge -> t