MakeSeeded.1-H
val hash : int -> t -> int
same as Hashtbl.SeededHashedType
equality predicate used to compare a key with the one in a container. Can return EDead
if the keys in the container are dead
create key data
creates a container from some initials keys and one data
val get_data : 'a container -> 'a option
get_data cont
returns the data if it is alive
val check_key : 'a container -> bool
check_key cont
checks if all the keys contained in the data are alive