patricia-tree 0.9.0 (latest)

Signature for sets implemented using Patricia trees. Most of this interface should be shared with Stdlib.Set.S.

type elt

The type of elements of the set

module BaseMap : 
  HETEROGENEOUS_MAP with type _ key = elt and type (_, _) value = unit

Underlying basemap, for cross map/set operations

Basic functions

type key = elt

Alias for the type of elements, for cross-compatibility with maps

type t = unit BaseMap.t

The set type

val empty : t

The empty set

val is_empty : t -> bool

is_empty st is true if st contains no elements, false otherwise

val mem : elt -> t -> bool

mem elt set is true if elt is contained in set, O(log(n)) complexity.

val add : elt -> t -> t

add elt set adds element elt to the set. Preserves physical equality if elt was already present. O(log(n)) complexity.

val singleton : elt -> t

singleton elt returns a set containing a single element: elt

val cardinal : t -> int

the size of the set (number of elements), O(n) complexity.

val is_singleton : t -> elt option

is_singleton set is Some (Any elt) if set is singleton elt and None otherwise.

val remove : elt -> t -> t

remove elt set returns a set containing all elements of set except elt. Returns a value physically equal to set if elt is not present.

val min_elt : t -> elt

The minimal element if non empty.

raises Not_found

val max_elt : t -> elt

The maximal element if non empty.

raises Not_found

val pop_minimum : t -> (elt * t) option

pop_minimum s is Some (elt, s') where elt = min_elt s and s' = remove elt s if s is non empty.

val pop_maximum : t -> (elt * t) option

pop_maximum s is Some (elt, s') where elt = max_elt s and s' = remove elt s if s is non empty.

Iterators

val iter : (elt -> unit) -> t -> unit

iter f set calls f on all elements of set, in order of Key.to_int.

val filter : (elt -> bool) -> t -> t

filter f set is the subset of set that only contains the elements that satisfy f. f is called in order of Key.to_int.

val for_all : (elt -> bool) -> t -> bool

for_all f set is true if f is true on all elements of set. Short-circuits on first false. f is called in order of Key.to_int.

val fold : (elt -> 'acc -> 'acc) -> t -> 'acc -> 'acc

fold f set acc returns f elt_n (... (f elt_1 acc) ...), where elt_1, ..., elt_n are the elements of set, in increasing order of Key.to_int

val split : elt -> t -> t * bool * t

split elt set returns s_lt, present, s_gt where s_lt contains all elements of set smaller than elt, s_gt all those greater than elt, and present is true if elt is in set.

val pretty : 
  ?pp_sep:(Stdlib.Format.formatter -> unit -> unit) ->
  (Stdlib.Format.formatter -> elt -> unit) ->
  Stdlib.Format.formatter ->
  t ->
  unit

Pretty prints the set, pp_sep is called once between each element, it defaults to Format.pp_print_cut

Functions on pairs of sets

val union : t -> t -> t

union a b is the set union of a and b, i.e. the set containing all elements that are either in a or b.

val inter : t -> t -> t

inter a b is the set intersection of a and b, i.e. the set containing all elements that are in both a or b.

val disjoint : t -> t -> bool

disjoint a b is true if a and b have no elements in common.

val equal : t -> t -> bool

equal a b is true if a and b contain the same elements.

val subset : t -> t -> bool

subset a b is true if all elements of a are also in b.

Conversion functions

val to_seq : t -> elt Stdlib.Seq.t

to_seq st iterates the whole set, in increasing order of Key.to_int

val to_rev_seq : t -> elt Stdlib.Seq.t

to_rev_seq st iterates the whole set, in decreasing order of Key.to_int

val add_seq : elt Stdlib.Seq.t -> t -> t

add_seq s st adds all elements of the sequence s to st in order.

val of_seq : elt Stdlib.Seq.t -> t

of_seq s creates a new set from the elements of s.

val of_list : elt list -> t

of_list l creates a new set from the elements of l.

val to_list : t -> elt list

to_list s returns the elements of s as a list, in increasing order of Key.to_int

package patricia-tree

Basic functions

Iterators

Functions on pairs of sets

Conversion functions