# Functor Ephemeron.K2.Make

    module Make: functor (H1 : Hashtbl.HashedType) -> functor (H2 : Hashtbl.HashedType) -> Ephemeron.S  with type key = H1.t * H2.t

Functor building an implementation of a weak hash table

Parameters: |
`H1` | : | `Hashtbl.HashedType`
`H2` | : | `Hashtbl.HashedType`

Propose the same interface as usual hash table. However since the bindings are weak, even if `mem h k` is true, a subsequent `find h k` may raise `Not_found` because the garbage collector can run between the two.

    type key

    type !'a t

    val create : int -> 'a t

    val clear : 'a t -> unit

    val reset : 'a t -> unit

    val copy : 'a t -> 'a t

    val add : 'a t -> key -> 'a -> unit

    val remove : 'a t -> key -> unit

    val find : 'a t -> key -> 'a

    val find_opt : 'a t -> key -> 'a option

    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 stats : 'a t -> Hashtbl.statistics

    val add_seq : 'a t -> (key * 'a) Seq.t -> unit

    val replace_seq : 'a t -> (key * 'a) Seq.t -> unit

    val of_seq : (key * 'a) Seq.t -> 'a t

    val clean : 'a t -> unit

remove all dead bindings. Done automatically during automatic resizing.

    val stats_alive : 'a t -> Hashtbl.statistics

same as `Hashtbl.SeededS.stats` but only count the alive bindings