Module Core.BagSource

Sourcemodule type S = sig ... end

The module type of the Bag module.

include S
Sourcemodule Elt : sig ... end
Sourcetype 'a t
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

Much of a bag's interface comes from the generic Base.Container module.

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.

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

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

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

create () returns an empty bag.

Sourceval add : 'a t -> 'a -> 'a Elt.t

add t v adds v to the bag t, returning an element that can later be removed from the bag. add runs in constant time.

Sourceval add_unit : 'a t -> 'a -> Base.Unit.t
Sourceval mem_elt : 'a t -> 'a Elt.t -> Base.Bool.t

mem_elt t elt returns whether or not elt is in t. It is like mem (included from Container), but it takes an 'a Elt.t instead of an 'a and runs in constant time instead of linear time.

Sourceval remove : 'a t -> 'a Elt.t -> Base.Unit.t

remove t elt removes elt from the bag t, raising an exception if elt is not in the bag. remove runs in constant time.

Sourceval choose : 'a t -> 'a Elt.t Base.Option.t

choose t returns some element in the bag.

Sourceval remove_one : 'a t -> 'a Base.Option.t

remove_one t removes some element from the bag, and returns its value. remove_one runs in constant time.

Sourceval clear : 'a t -> Base.Unit.t

clear t removes all elements from the bag. clear runs in constant time.

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

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

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

iter_elt t ~f calls f on each element of the bag.

Sourceval find_elt : 'a t -> f:('a -> Base.Bool.t) -> 'a Elt.t Base.Option.t

find_elt t ~f returns the first element in the bag satisfying f, returning None if none is found.

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

until_empty t f repeatedly removes values v from t, running f v on each one, until t is empty. Running f may add elements to t if it wants.

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

transfer ~src ~dst moves all of the elements from src to dst in constant time.

Sourceval of_list : 'a Base.List.t -> 'a t
Sourceval elts : 'a t -> 'a Elt.t Base.List.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. Elements added by f may or may not be visited; elements removed by f that have not been visited will not be visited. It is an (undetected) error to delete the current element.