From https://github.com/mjambon/mixtbl (thanks to him). Example:
let inj_int = CCMixtbl.create_inj () ;;
let tbl = CCMixtbl.create 10 ;;
OUnit.assert_equal None (CCMixtbl.get ~inj:inj_int tbl "a");;
CCMixtbl.set inj_int tbl "a" 1;;
OUnit.assert_equal (Some 1) (CCMixtbl.get ~inj:inj_int tbl "a");;
let inj_string = CCMixtbl.create_inj () ;;
CCMixtbl.set inj_string tbl "b" "Hello";
OUnit.assert_equal (Some "Hello") (CCMixtbl.get inj_string tbl "b");;
OUnit.assert_equal None (CCMixtbl.get inj_string tbl "a");;
OUnit.assert_equal (Some 1) (CCMixtbl.get inj_int tbl "a");;
CCMixtbl.set inj_string tbl "a" "Bye";;
OUnit.assert_equal None (CCMixtbl.get inj_int tbl "a");;
OUnit.assert_equal (Some "Bye") (CCMixtbl.get inj_string tbl "a");;A hash table containing values of different types. The type parameter 'a represents the type of the keys.
An accessor for values of type 'b in any table. Values put in the table using a key can only be retrieved using this very same key.
val create : int -> 'a tcreate n creates a hash table of initial size n.
val create_inj : unit -> 'b injectionReturn a value that works for a given type of values. This function is normally called once for each type of value. Several keys may be created for the same type, but a value set with a given setter can only be retrieved with the matching getter. The same key can be reused across multiple tables (although not in a thread-safe way).
Get the value corresponding to this key, if it exists and belongs to the same key
Find the value for the given key, which must be of the right type.
Not_found if either the key is not found, or if its value doesn't belong to the right type
val length : 'a t -> intNumber of bindings
val clear : 'a t -> unitClear content of the hashtable
val remove : 'a t -> 'a -> unitRemove the binding for this key
val iter_keys : 'a t -> ('a -> unit) -> unitIterate on the keys of this table
val fold_keys : 'a t -> 'b -> ('b -> 'a -> 'b) -> 'bFold over the keys
All the bindings that come from the corresponding injection