module type S =`sig`

..`end`

The output signature of the functor

`Weak.Make`

.`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`

.
Raise `Not_found`

if there is no such element.`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.