NAME

       Weak.Make - Functor building an implementation of the weak hash set structure.

Module

       Module   Weak.Make

Documentation

       Module Make
        : functor (H : Hashtbl.HashedType) -> sig end

       Functor  building  an implementation of the weak hash set structure.  H.equal can't be the
       physical equality, since only shallow copies of the elements in the set are given to it.

       Parameters:

       "H"

       Stdlib.Hashtbl.HashedType

       type data

       The type of the elements stored in the table.

       type t

       The type of tables that contain elements of type data .  Note that weak hash  sets  cannot
       be marshaled using output_value or the functions of the Marshal module.

       val create : int -> t

       create  n  creates  a new empty weak hash set, of initial size n .  The table will grow as
       needed.

       val clear : t -> unit

       Remove all elements from the table.

       val merge : t -> data -> data

       merge t x returns an instance of x found in t if any, or else adds x to t and return x .

       val add : t -> data -> unit

       add t x adds x to t .  If there is already an instance of x in t , it is unspecified which
       one will be returned by subsequent calls to find and merge .

       val remove : t -> data -> unit

       remove  t  x removes from t one instance of x .  Does nothing if there is no instance of x
       in t .

       val find : t -> data -> data

       find t x returns an instance of x found in t .

       Raises Not_found if there is no such element.

       val find_opt : t -> data -> data option

       find_opt t x returns an instance of x found in t or None if there is no such element.

       Since 4.05

       val find_all : t -> data -> data list

       find_all t x returns a list of all the instances of x found in t .

       val mem : t -> data -> bool

       mem t x returns true if there is at least one instance of x in t , false otherwise.

       val iter : (data -> unit) -> t -> unit

       iter f t calls f on each element of t , in some unspecified order.  It  is  not  specified
       what happens if f tries to change t itself.

       val fold : (data -> 'a -> 'a) -> t -> 'a -> 'a

       fold  f  t init computes (f d1 (... (f dN init))) where d1 ... dN are the elements of t in
       some unspecified order.  It is not specified what happens if f tries to change t itself.

       val count : t -> int

       Count the number of elements in the table.  count t gives the same result as fold (fun _ n
       -> n+1) t 0 but does not delay the deallocation of the dead elements.

       val stats : t -> int * int * int * int * int * int

       Return  statistics  on  the  table.   The  numbers  are, in order: table length, number of
       entries, sum of bucket lengths, smallest bucket  length,  median  bucket  length,  biggest
       bucket length.