package base

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package base
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Module Indexed_container.Make0Source

Parameters

module T : sig ... end

Signature

include Container.S0 with type t := T.t with type elt := T.Elt.t
Sourceval mem : T.t -> T.Elt.t -> bool

Checks whether the provided element is there, using equality on elts.

Sourceval length : T.t -> int
Sourceval is_empty : T.t -> bool
Sourceval iter : T.t -> f:(T.Elt.t -> unit) -> unit

iter must allow exceptions raised in f to escape, terminating the iteration cleanly. The same holds for all functions below taking an f.

Sourceval fold : T.t -> init:'acc -> f:('acc -> T.Elt.t -> '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 : T.t -> init:'acc -> f:('acc -> T.Elt.t -> ('acc, 'e) Result.t) -> ('acc, 'e) 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 : T.t -> init:'acc -> f:('acc -> T.Elt.t -> ('acc, 'final) 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 : T.t -> f:(T.Elt.t -> 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 : T.t -> f:(T.Elt.t -> 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 : T.t -> f:(T.Elt.t -> bool) -> int

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

Sourceval sum : (module Container.Summable with type t = 'sum) -> T.t -> f:(T.Elt.t -> 'sum) -> 'sum

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

Sourceval find : T.t -> f:(T.Elt.t -> bool) -> T.Elt.t option

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

Sourceval find_map : T.t -> f:(T.Elt.t -> 'a option) -> 'a option

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

Sourceval to_list : T.t -> T.Elt.t list
Sourceval to_array : T.t -> T.Elt.t array
Sourceval min_elt : T.t -> compare:(T.Elt.t -> T.Elt.t -> int) -> T.Elt.t option

Returns a min (resp. max) element from the collection using the provided compare function. 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. Returns None iff the collection is empty.

Sourceval max_elt : T.t -> compare:(T.Elt.t -> T.Elt.t -> int) -> T.Elt.t option

These are all like their equivalents in Container except that an index starting at 0 is added as the first argument to f.

Sourceval foldi : T.t -> init:_ -> f:(int -> _ -> T.Elt.t -> _) -> _
Sourceval iteri : T.t -> f:(int -> T.Elt.t -> unit) -> unit
Sourceval existsi : T.t -> f:(int -> T.Elt.t -> bool) -> bool
Sourceval for_alli : T.t -> f:(int -> T.Elt.t -> bool) -> bool
Sourceval counti : T.t -> f:(int -> T.Elt.t -> bool) -> int
Sourceval findi : T.t -> f:(int -> T.Elt.t -> bool) -> (int * T.Elt.t) option
Sourceval find_mapi : T.t -> f:(int -> T.Elt.t -> 'a option) -> 'a option
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