Module type CCWBTree.S

type key
type +'a t
val empty : 'a t
val is_empty : _ t -> bool
val singleton : key -> 'a -> 'a t
val mem : key -> _ t -> bool
val get : key -> 'a t -> 'a option
val get_exn : key -> 'a t -> 'a
  • raises Not_found

    if the key is not present.

val nth : int -> 'a t -> (key * 'a) option

nth i m returns the i-th key, value in the ascending order. Complexity is O(log (cardinal m)).

val nth_exn : int -> 'a t -> key * 'a
  • raises Not_found

    if the index is invalid.

val get_rank : key -> 'a t -> [ `At of int | `After of int | `First ]

get_rank k m looks for the rank of k in m, i.e. the index of k in the sorted list of bindings of m. let (`At n) = get_rank k m in nth_exn n m = get m k should hold.

  • since 1.4
val add : key -> 'a -> 'a t -> 'a t
val remove : key -> 'a t -> 'a t
val update : key -> ('a option -> 'a option) -> 'a t -> 'a t

update k f m calls f (Some v) if get k m = Some v, f None otherwise. Then, if f returns Some v' it binds k to v', if f returns None it removes k.

val cardinal : _ t -> int
val weight : _ t -> int
val fold : f:('b -> key -> 'a -> 'b) -> x:'b -> 'a t -> 'b
val mapi : f:(key -> 'a -> 'b) -> 'a t -> 'b t

Map values, giving both key and value.

  • since 0.17
val map : f:('a -> 'b) -> 'a t -> 'b t

Map values, giving only the value.

  • since 0.17
val iter : f:(key -> 'a -> unit) -> 'a t -> unit
val split : key -> 'a t -> 'a t * 'a option * 'a t

split k t returns l, o, r where l is the part of the map with keys smaller than k, r has keys bigger than k, and o = Some v if k, v belonged to the map.

val merge : f:(key -> 'a option -> 'b option -> 'c option) -> 'a t -> 'b t -> 'c t

Like Map.S.merge.

val extract_min : 'a t -> key * 'a * 'a t

extract_min m returns k, v, m' where k,v is the pair with the smallest key in m, and m' does not contain k.

  • raises Not_found

    if the map is empty.

val extract_max : 'a t -> key * 'a * 'a t

extract_max m returns k, v, m' where k,v is the pair with the highest key in m, and m' does not contain k.

  • raises Not_found

    if the map is empty.

val choose : 'a t -> (key * 'a) option
val choose_exn : 'a t -> key * 'a
  • raises Not_found

    if the tree is empty.

val random_choose : Stdlib.Random.State.t -> 'a t -> key * 'a

Randomly choose a (key,value) pair within the tree, using weights as probability weights.

  • raises Not_found

    if the tree is empty.

val add_list : 'a t -> (key * 'a) list -> 'a t
val of_list : (key * 'a) list -> 'a t
val to_list : 'a t -> (key * 'a) list
val add_iter : 'a t -> (key * 'a) iter -> 'a t
val of_iter : (key * 'a) iter -> 'a t
val to_iter : 'a t -> (key * 'a) iter
val add_gen : 'a t -> (key * 'a) gen -> 'a t
val of_gen : (key * 'a) gen -> 'a t
val to_gen : 'a t -> (key * 'a) gen
val pp : ?pp_start:unit printer -> ?pp_stop:unit printer -> ?pp_arrow:unit printer -> ?pp_sep:unit printer -> key printer -> 'a printer -> 'a t printer

Renamed from val print.

  • since 2.0