package javalib

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type key = S.t
type 'a t
val empty : 'a t
val is_empty : 'a t -> bool
val add : key -> 'a -> 'a t -> 'a t
val cardinal : 'a t -> int
val modify : key -> ('a option -> 'a) -> 'a t -> 'a t
val find : key -> 'a t -> 'a
val remove : key -> 'a t -> 'a t
val mem : key -> 'a t -> bool
val iter : (key -> 'a -> unit) -> 'a t -> unit
val map : ('a -> 'b) -> 'a t -> 'b t
val mapi : (key -> 'a -> 'b) -> 'a t -> 'b t
val fold : (key -> 'a -> 'b -> 'b) -> 'a t -> 'b -> 'b
val compare : ('a -> 'a -> int) -> 'a t -> 'a t -> int
val equal : ('a -> 'a -> bool) -> 'a t -> 'a t -> bool
val merge : ('a -> 'a -> 'a) -> 'a t -> 'a t -> 'a t
val choose_and_remove : 'a t -> key * 'a * 'a t
val filter : ('a -> bool) -> 'a t -> 'a t
val filteri : (key -> 'a -> bool) -> 'a t -> 'a t
val key_elements : 'a t -> key list
val value_elements : 'a t -> 'a list
val elements : 'a t -> (key * 'a) list
val subset : ('a -> 'a -> bool) -> 'a t -> 'a t -> bool