Module Weak_hashtbl

Like Core.Weak_hashtbl, but automatically collects keys with unused data, rather than requiring user code to call remove_keys_with_unused_data.


include module type of Core.Std.Weak_hashtbl
type ('a, 'b) t
val sexp_of_t : ('a -> Sexplib.Sexp.t) -> ('b -> Sexplib.Sexp.t) -> ('a, 'b) t -> Sexplib.Sexp.t
val create : ?growth_allowed:bool -> ?size:int -> 'a Core_kernel.Std.Hashtbl.Hashable.t -> ('a, 'b) t
val mem : ('a, _) t -> 'a -> bool
val find : ('a, 'b) t -> 'a -> 'b Core_kernel.Std.Heap_block.t option
val find_or_add : ('a, 'b) t -> 'a -> default:(unit -> 'b Core_kernel.Std.Heap_block.t) -> 'b Core_kernel.Std.Heap_block.t
val remove : ('a, 'b) t -> 'a -> unit
val add_exn : ('a, 'b) t -> key:'a -> data:'b Core_kernel.Std.Heap_block.t -> unit
val replace : ('a, 'b) t -> key:'a -> data:'b Core_kernel.Std.Heap_block.t -> unit
val key_is_using_space : ('a, _) 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 : (_, _) 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 : (_, _) 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.

val remove_keys_with_unused_data : [
| `Do_not_use
] -> unit
val set_run_when_unused_data : [
| `Do_not_use
] -> unit