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Industrial strength alternative to OCaml's standard library

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doc/core/Core/Doubly_linked/index.html

Module Core.Doubly_linkedSource

Sourcemodule type S = sig ... end
include S
Sourcemodule Elt : sig ... end
Sourcetype 'a t
include Ppx_compare_lib.Comparable.S1 with type 'a t := 'a t
Sourceval compare : ('a -> 'a -> int) -> 'a t -> 'a t -> int
include Sexplib0.Sexpable.S1 with type 'a t := 'a t
Sourceval t_of_sexp : (Sexplib0.Sexp.t -> 'a) -> Sexplib0.Sexp.t -> 'a t
Sourceval sexp_of_t : ('a -> Sexplib0.Sexp.t) -> 'a t -> Sexplib0.Sexp.t
include Container.S1 with type 'a t := 'a t
Sourceval mem : 'a t -> 'a -> equal:('a -> 'a -> bool) -> bool

Checks whether the provided element is there, using equal.

Sourceval length : 'a t -> int
Sourceval is_empty : 'a t -> bool
Sourceval iter : 'a t -> f:('a -> unit) -> unit
Sourceval fold : 'a t -> init:'acc -> f:('acc -> 'a -> 'acc) -> 'acc

fold t ~init ~f returns f (... f (f (f init e1) e2) e3 ...) en, where e1..en are the elements of t

Sourceval fold_result : 'a t -> init:'acc -> f:('acc -> 'a -> ('acc, 'e) Base.Result.t) -> ('acc, 'e) Base.Result.t

fold_result t ~init ~f is a short-circuiting version of fold that runs in the Result monad. If f returns an Error _, that value is returned without any additional invocations of f.

Sourceval fold_until : 'a t -> init:'acc -> f:('acc -> 'a -> ('acc, 'final) Base.Container.Continue_or_stop.t) -> finish:('acc -> 'final) -> 'final

fold_until t ~init ~f ~finish is a short-circuiting version of fold. If f returns Stop _ the computation ceases and results in that value. If f returns Continue _, the fold will proceed. If f never returns Stop _, the final result is computed by finish.

Example:

  type maybe_negative =
    | Found_negative of int
    | All_nonnegative of { sum : int }

  (** [first_neg_or_sum list] returns the first negative number in [list], if any,
      otherwise returns the sum of the list. *)
  let first_neg_or_sum =
    List.fold_until ~init:0
      ~f:(fun sum x ->
        if x < 0
        then Stop (Found_negative x)
        else Continue (sum + x))
      ~finish:(fun sum -> All_nonnegative { sum })
  ;;

  let x = first_neg_or_sum [1; 2; 3; 4; 5]
  val x : maybe_negative = All_nonnegative {sum = 15}

  let y = first_neg_or_sum [1; 2; -3; 4; 5]
  val y : maybe_negative = Found_negative -3
Sourceval exists : 'a t -> f:('a -> bool) -> bool

Returns true if and only if there exists an element for which the provided function evaluates to true. This is a short-circuiting operation.

Sourceval for_all : 'a t -> f:('a -> bool) -> bool

Returns true if and only if the provided function evaluates to true for all elements. This is a short-circuiting operation.

Sourceval count : 'a t -> f:('a -> bool) -> int

Returns the number of elements for which the provided function evaluates to true.

Returns the sum of f i for all i in the container.

Sourceval sum : (module Base.Container.Summable with type t = 'sum) -> 'a t -> f:('a -> 'sum) -> 'sum
Sourceval find : 'a t -> f:('a -> bool) -> 'a option

Returns as an option the first element for which f evaluates to true.

Sourceval find_map : 'a t -> f:('a -> 'b option) -> 'b option

Returns the first evaluation of f that returns Some, and returns None if there is no such element.

Sourceval to_list : 'a t -> 'a list
Sourceval to_array : 'a t -> 'a array
Sourceval min_elt : 'a t -> compare:('a -> 'a -> int) -> 'a option

Returns a minimum (resp maximum) element from the collection using the provided compare function, or None if the collection is empty. In case of a tie, the first element encountered while traversing the collection is returned. The implementation uses fold so it has the same complexity as fold.

Sourceval max_elt : 'a t -> compare:('a -> 'a -> int) -> 'a option
include Base.Invariant.S1 with type 'a t := 'a t
Sourceval invariant : ('a -> unit) -> 'a t -> unit

Creating doubly-linked lists

Sourceval create : Base.Unit.t -> 'a t
Sourceval of_list : 'a Base.List.t -> 'a t

of_list l returns a doubly-linked list t with the same elements as l and in the same order (i.e., the first element of l is the first element of t). It is always the case that l = to_list (of_list l).

Sourceval of_array : 'a Base.Array.t -> 'a t

Predicates

Sourceval equal : 'a t -> 'a t -> Base.Bool.t

pointer equality

Sourceval is_first : 'a t -> 'a Elt.t -> Base.Bool.t
Sourceval is_last : 'a t -> 'a Elt.t -> Base.Bool.t
Sourceval mem_elt : 'a t -> 'a Elt.t -> Base.Bool.t

Constant-time extraction of first and last elements

Sourceval first_elt : 'a t -> 'a Elt.t Base.Option.t
Sourceval last_elt : 'a t -> 'a Elt.t Base.Option.t
Sourceval first : 'a t -> 'a Base.Option.t
Sourceval last : 'a t -> 'a Base.Option.t
Sourceval first_exn : 'a t -> 'a
Sourceval last_exn : 'a t -> 'a

Constant-time retrieval of next or previous element

Sourceval next : 'a t -> 'a Elt.t -> 'a Elt.t Base.Option.t
Sourceval prev : 'a t -> 'a Elt.t -> 'a Elt.t Base.Option.t

Constant-time insertion of a new element

Sourceval insert_before : 'a t -> 'a Elt.t -> 'a -> 'a Elt.t
Sourceval insert_after : 'a t -> 'a Elt.t -> 'a -> 'a Elt.t
Sourceval insert_first : 'a t -> 'a -> 'a Elt.t
Sourceval insert_last : 'a t -> 'a -> 'a Elt.t

Constant-time move of an element from and to positions in the same list

An exception is raised if elt is equal to anchor.

Sourceval move_to_front : 'a t -> 'a Elt.t -> Base.Unit.t
Sourceval move_to_back : 'a t -> 'a Elt.t -> Base.Unit.t
Sourceval move_after : 'a t -> 'a Elt.t -> anchor:'a Elt.t -> Base.Unit.t
Sourceval move_before : 'a t -> 'a Elt.t -> anchor:'a Elt.t -> Base.Unit.t

Constant-time removal of an element

Sourceval remove : 'a t -> 'a Elt.t -> Base.Unit.t
Sourceval remove_first : 'a t -> 'a Base.Option.t
Sourceval remove_last : 'a t -> 'a Base.Option.t
Sourceval iteri : 'a t -> f:(Base.Int.t -> 'a -> Base.Unit.t) -> Base.Unit.t
Sourceval foldi : 'a t -> init:'acc -> f:(Base.Int.t -> 'acc -> 'a -> 'acc) -> 'acc
Sourceval fold_elt : 'a t -> init:'acc -> f:('acc -> 'a Elt.t -> 'acc) -> 'acc

fold_elt t ~init ~f is the same as fold, except f is called with the 'a Elt.t's from the list instead of the contained 'a values.

Note that like other iteration functions, it is an error to mutate t inside the fold. If you'd like to call remove on any of the 'a Elt.t's, use filter_inplace.

Sourceval foldi_elt : 'a t -> init:'acc -> f:(Base.Int.t -> 'acc -> 'a Elt.t -> 'acc) -> 'acc
Sourceval iter_elt : 'a t -> f:('a Elt.t -> Base.Unit.t) -> Base.Unit.t
Sourceval iteri_elt : 'a t -> f:(Base.Int.t -> 'a Elt.t -> Base.Unit.t) -> Base.Unit.t
Sourceval fold_right : 'a t -> init:'acc -> f:('a -> 'acc -> 'acc) -> 'acc
Sourceval fold_right_elt : 'a t -> init:'acc -> f:('a Elt.t -> 'acc -> 'acc) -> 'acc
Sourceval find_elt : 'a t -> f:('a -> Base.Bool.t) -> 'a Elt.t Base.Option.t

find_elt t ~f finds the first element in t that satisfies f, by testing each of element of t in turn until f succeeds.

Sourceval findi_elt : 'a t -> f:(Base.Int.t -> 'a -> Base.Bool.t) -> (Base.Int.t * 'a Elt.t) Base.Option.t
Sourceval clear : 'a t -> Base.Unit.t

clear t removes all elements from the list in constant time.

Sourceval copy : 'a t -> 'a t
Sourceval transfer : src:'a t -> dst:'a t -> Base.Unit.t

transfer ~src ~dst has the same behavior as iter src ~f:(insert_last dst); clear src except that it runs in constant time.

If s = to_list src and d = to_list dst, then after transfer ~src ~dst:

to_list src = []

to_list dst = d @ s

Linear-time mapping of lists (creates a new list)

Sourceval map : 'a t -> f:('a -> 'b) -> 'b t
Sourceval mapi : 'a t -> f:(Base.Int.t -> 'a -> 'b) -> 'b t
Sourceval filter : 'a t -> f:('a -> Base.Bool.t) -> 'a t
Sourceval filteri : 'a t -> f:(Base.Int.t -> 'a -> Base.Bool.t) -> 'a t
Sourceval filter_map : 'a t -> f:('a -> 'b Base.Option.t) -> 'b t
Sourceval filter_mapi : 'a t -> f:(Base.Int.t -> 'a -> 'b Base.Option.t) -> 'b t

Linear-time partition of lists (creates two new lists)

Sourceval partition_tf : 'a t -> f:('a -> Base.Bool.t) -> 'a t * 'a t
Sourceval partitioni_tf : 'a t -> f:(Base.Int.t -> 'a -> Base.Bool.t) -> 'a t * 'a t
Sourceval partition_map : 'a t -> f:('a -> ('b, 'c) Either.t) -> 'b t * 'c t
Sourceval partition_mapi : 'a t -> f:(Base.Int.t -> 'a -> ('b, 'c) Either.t) -> 'b t * 'c t

Linear-time in-place mapping of lists

Sourceval map_inplace : 'a t -> f:('a -> 'a) -> Base.Unit.t

map_inplace t ~f replaces all values v with f v

Sourceval mapi_inplace : 'a t -> f:(Base.Int.t -> 'a -> 'a) -> Base.Unit.t
Sourceval filter_inplace : 'a t -> f:('a -> Base.Bool.t) -> Base.Unit.t

filter_inplace t ~f removes all elements of t that don't satisfy f.

Sourceval filteri_inplace : 'a t -> f:(Base.Int.t -> 'a -> Base.Bool.t) -> Base.Unit.t
Sourceval filter_map_inplace : 'a t -> f:('a -> 'a Base.Option.t) -> Base.Unit.t

If f returns None, the element is removed, else the value is replaced with the contents of the Some

Sourceval filter_mapi_inplace : 'a t -> f:(Base.Int.t -> 'a -> 'a Base.Option.t) -> Base.Unit.t
Sourceval unchecked_iter : 'a t -> f:('a -> Base.Unit.t) -> Base.Unit.t

unchecked_iter t ~f behaves like iter t ~f except that f is allowed to modify t. Adding or removing elements before the element currently being visited has no effect on the traversal. Elements added after the element currently being visited will be traversed. Elements deleted after the element currently being visited will not be traversed. Deleting the element currently being visited is an error that is not detected (presumably leading to an infinite loop).

Sourceval to_sequence : 'a t -> 'a Sequence.t

A sequence of values from the doubly-linked list. It makes an intermediate copy of the list so that the returned sequence is immune to any subsequent mutation of the original list.

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