Module CCMixset

module CCMixset: sig .. end

Set of Heterogeneous Values

      let k1 : int key = newkey () in
      let k2 : int key = newkey () in
      let k3 : string key = newkey () in
      let set =
        |> set ~key:k1 1
        |> set ~key:k2 2
        |> set ~key:k3 "3"
      assert (get ~key:k1 set = Some 1);
      assert (get ~key:k2 set = Some 2);
      assert (get ~key:k3 set = Some "3");

Since 0.11

type t 
A set of values of heterogeneous types
type 'a key 
A unique "key" to access a value of type 'a in a set
val newkey : unit -> 'a key
newkey () creates a new unique key that can be used to access a 'a value in a set. Each key created with newkey is distinct from any other key, even if they have the same type.

Not thread-safe.

val empty : t
Empty set
val set : key:'a key -> 'a -> t -> t
set ~key v set maps key to v in set. It means that for every set, get ~key (set ~key v set) = Some v.
val get : key:'a key -> t -> 'a option
get ~key set obtains the value for key in set, if any.
val get_exn : key:'a key -> t -> 'a
Same as CCMixset.get, but can fail
Raises Not_found if the key is not present
val cardinal : t -> int
Number of mappings