module Weak_hashtbl: Weak_hashtbl
type ('a, 'b) t
val create : 'a Std_internal.Hashtbl.Hashable.t -> ('a, 'b) t
val mem : ('a, 'b) t -> 'a -> bool
val find : ('a, 'b) t -> 'a -> 'b Heap_block.t option
val find_or_add : ('a, 'b) t ->
'a -> default:(unit -> 'b Heap_block.t) -> 'b Heap_block.t
val remove : ('a, 'b) t -> 'a -> unit
val replace : ('a, 'b) t -> key:'a -> data:'b Heap_block.t -> unit
val key_is_using_space : ('a, 'b) t -> 'a -> bool
key_is_using_space t key returns true if key is using some space in t. mem t
key implies key_is_using_space t key, but it is also possible that that
key_is_using_space t key && not (mem t key).
val reclaim_space_for_keys_with_unused_data : ('a, 'b) t -> unit
reclaim_space_for_keys_with_unused_data t reclaims space for all keys in t whose
data has been detected (by a finalizer) to be unused. Only keys such that
key_is_using_space t key && not (mem t key) will be reclaimed.
val set_run_when_unused_data : ('a, 'b) t -> thread_safe_f:(unit -> unit) -> unit
set_run_when_unused_data t ~thread_safe_f calls thread_safe_f in the finalizer
attached to each data in t, after ensuring the entry being finalized will be
handled in the next call to reclaim_space_for_keys_with_unused_data. This can be
used to arrange to call reclaim_space_for_keys_with_unused_data at a convenient time
in the future. thread_safe_f must be thread safe -- it is *not* safe for it to call
any Weak_hashtbl functions.