Parameter Minimal.2-HM

type 'a return
type 'a t
type key
val create : ?⁠size:int -> unit -> 'a t
val create_from : 'a t -> 'a t
val empty : 'a return
val clear : 'a t -> unit
val is_empty : 'a t -> bool
val add : key -> 'a -> 'a t -> 'a t
val remove : key -> 'a t -> 'a t
val mem : key -> 'a t -> bool
val find : key -> 'a t -> 'a
val find_and_raise : key -> 'a t -> string -> 'a

find_and_raise k t s is equivalent to find k t but raises Invalid_argument s when find k t raises Not_found

val iter : (key -> 'a -> unit) -> 'a t -> unit
val map : (key -> 'a -> key * 'a) -> 'a t -> 'a t
val fold : (key -> 'a -> 'b -> 'b) -> 'a t -> 'b -> 'b
val copy : 'a t -> 'a t