package ppx_deriving

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package ppx_deriving
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Module Ephemeron.K1

type ('k, 'd) t

an ephemeron with one key

val create : unit -> ('k, 'd) t

Ephemeron.K1.create () creates an ephemeron with one key. The data and the key are empty

val get_key : ('k, 'd) t -> 'k option

Ephemeron.K1.get_key eph returns None if the key of eph is empty, Some x (where x is the key) if it is full.

val get_key_copy : ('k, 'd) t -> 'k option

Ephemeron.K1.get_key_copy eph returns None if the key of eph is empty, Some x (where x is a (shallow) copy of the key) if it is full. This function has the same GC friendliness as Weak.get_copy

If the element is a custom block it is not copied.

val set_key : ('k, 'd) t -> 'k -> unit

Ephemeron.K1.set_key eph el sets the key of eph to be a (full) key to el

val unset_key : ('k, 'd) t -> unit

Ephemeron.K1.unset_key eph el sets the key of eph to be an empty key. Since there is only one key, the ephemeron starts behaving like a reference on the data.

val check_key : ('k, 'd) t -> bool

Ephemeron.K1.check_key eph returns true if the key of the eph is full, false if it is empty. Note that even if Ephemeron.K1.check_key eph returns true, a subsequent Ephemeron.K1.get_keyeph can return None.

val blit_key : ('k, _) t -> ('k, _) t -> unit

Ephemeron.K1.blit_key eph1 eph2 sets the key of eph2 with the key of eph1. Contrary to using Ephemeron.K1.get_key followed by Ephemeron.K1.set_key or Ephemeron.K1.unset_key this function does not prevent the incremental GC from erasing the value in its current cycle.

val get_data : ('k, 'd) t -> 'd option

Ephemeron.K1.get_data eph returns None if the data of eph is empty, Some x (where x is the data) if it is full.

val get_data_copy : ('k, 'd) t -> 'd option

Ephemeron.K1.get_data_copy eph returns None if the data of eph is empty, Some x (where x is a (shallow) copy of the data) if it is full. This function has the same GC friendliness as Weak.get_copy

If the element is a custom block it is not copied.

val set_data : ('k, 'd) t -> 'd -> unit

Ephemeron.K1.set_data eph el sets the data of eph to be a (full) data to el

val unset_data : ('k, 'd) t -> unit

Ephemeron.K1.unset_data eph el sets the key of eph to be an empty key. The ephemeron starts behaving like a weak pointer.

val check_data : ('k, 'd) t -> bool

Ephemeron.K1.check_data eph returns true if the data of the eph is full, false if it is empty. Note that even if Ephemeron.K1.check_data eph returns true, a subsequent Ephemeron.K1.get_dataeph can return None.

val blit_data : (_, 'd) t -> (_, 'd) t -> unit

Ephemeron.K1.blit_data eph1 eph2 sets the data of eph2 with the data of eph1. Contrary to using Ephemeron.K1.get_data followed by Ephemeron.K1.set_data or Ephemeron.K1.unset_data this function does not prevent the incremental GC from erasing the value in its current cycle.

module Make (H : Hashtbl.HashedType) : S with type key = H.t

Functor building an implementation of a weak hash table

Functor building an implementation of a weak hash table. The seed is similar to the one of Hashtbl.MakeSeeded.