Module CCMixset

Set of Heterogeneous Values

      let k1 : int key = newkey () in
      let k2 : int key = newkey () in
      let k3 : string key = newkey () in
      let set =
        empty
        |> set ~key:k1 1
        |> set ~key:k2 2
        |> set ~key:k3 "3"
      in
      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 get, but can fail.

Raises Not_found: if the key is not present.

val cardinal : t ‑> int

Number of mappings.