package core_kernel

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package core_kernel
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A simple polymorphic functional double-ended queue. Use this if you need a queue-like data structure that provides enqueue and dequeue accessors on both ends. For strictly first-in, first-out access, see Fqueue.

Amortized running times assume that enqueue/dequeue are used sequentially, threading the changing deque through the calls.

type 'a t
val bin_read_t : 'a Bin_prot.Read.reader -> 'a t Bin_prot.Read.reader
val __bin_read_t__ : 'a Bin_prot.Read.reader -> (Base.Int.t -> 'a t) Bin_prot.Read.reader
val bin_size_t : 'a Bin_prot.Size.sizer -> 'a t Bin_prot.Size.sizer
val bin_write_t : 'a Bin_prot.Write.writer -> 'a t Bin_prot.Write.writer
val bin_shape_t : Bin_prot.Shape.t -> Bin_prot.Shape.t
val compare : ('a -> 'a -> Base.Int.t) -> 'a t -> 'a t -> Base.Int.t
val hash_fold_t : (Base.Hash.state -> 'a -> Base.Hash.state) -> Base.Hash.state -> 'a t -> Base.Hash.state
val t_of_sexp : (Ppx_sexp_conv_lib.Sexp.t -> 'a) -> Ppx_sexp_conv_lib.Sexp.t -> 'a t
val sexp_of_t : ('a -> Ppx_sexp_conv_lib.Sexp.t) -> 'a t -> Ppx_sexp_conv_lib.Sexp.t

Container operations traverse deque elements front-to-back, like Front_to_back below. If you need faster traversal and don't care about the order, use Arbitrary_order below.

is_empty and length have worst-case complexity O(1).

include Container.S1 with type 'a t := 'a t
val mem : 'a t -> 'a -> equal:('a -> 'a -> bool) -> bool

Checks whether the provided element is there, using equal.

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

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

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

val fold_until : 'a t -> init:'accum -> f:('accum -> 'a -> ('accum, 'final) Base__.Container_intf.Continue_or_stop.t) -> finish:('accum -> '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.

val 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.

val 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.

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

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

val sum : (module Base.Commutative_group.S with type t = 'sum) -> 'a t -> f:('a -> 'sum) -> 'sum

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

val find : 'a t -> f:('a -> bool) -> 'a option

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

val 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.

val to_list : 'a t -> 'a list
val to_array : 'a t -> 'a array
val 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.

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

t >>= f returns a computation that sequences the computations represented by two monad elements. The resulting computation first does t to yield a value v, and then runs the computation returned by f v.

val (>>|) : 'a t -> ('a -> 'b) -> 'b t

t >>| f is t >>= (fun a -> return (f a)).

module Monad_infix : sig ... end
val bind : 'a t -> f:('a -> 'b t) -> 'b t

bind t ~f = t >>= f

val return : 'a -> 'a t

return v returns the (trivial) computation that returns v.

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

map t ~f is t >>| f.

val join : 'a t t -> 'a t

join t is t >>= (fun t' -> t').

val ignore_m : 'a t -> unit t

ignore_m t is map t ~f:(fun _ -> ()). ignore_m used to be called ignore, but we decided that was a bad name, because it shadowed the widely used Pervasives.ignore. Some monads still do let ignore = ignore_m for historical reasons.

val all : 'a t list -> 'a list t
val all_unit : unit t list -> unit t
val all_ignore : unit t list -> unit t
  • deprecated [since 2018-02] Use [all_unit]
module Let_syntax : sig ... end

These are convenient to have in scope when programming with a monad:

module Arbitrary_order : sig ... end

Traverse deque elements in arbitrary order.

module Front_to_back : sig ... end

Traverse deque elements front-to-back. Incurs up to O(n) additional time and space cost over Arbitrary_order.

module Back_to_front : sig ... end

Traverse deque elements back-to-front. Incurs up to O(n) additional time and space cost over Arbitrary_order.

val empty : _ t

The empty deque.

val singleton : 'a -> 'a t

A one-element deque.

val of_list : 'a Base.List.t -> 'a t

of_list returns a deque with elements in the same front-to-back order as the list.

val rev : 'a t -> 'a t

rev t returns t, reversed.

Complexity: worst-case O(1).

val enqueue : 'a t -> [ `back | `front ] -> 'a -> 'a t

enqueue t side x produces t updated with x added to its side.

Complexity: worst-case O(1).

val enqueue_front : 'a t -> 'a -> 'a t
val enqueue_back : 'a t -> 'a -> 'a t
val peek : 'a t -> [ `back | `front ] -> 'a Base.Option.t

peek t side produces Some of the element at the side of t, or None if t is empty.

Complexity: worst-case O(1).

val peek_exn : 'a t -> [ `back | `front ] -> 'a
val peek_front : 'a t -> 'a Base.Option.t
val peek_front_exn : 'a t -> 'a
val peek_back : 'a t -> 'a Base.Option.t
val peek_back_exn : 'a t -> 'a
val drop : 'a t -> [ `back | `front ] -> 'a t Base.Option.t

drop t side produces Some of t with the element at its side removed, or None if t is empty.

Complexity: amortized O(1), worst-case O(length t).

val drop_exn : 'a t -> [ `back | `front ] -> 'a t
val drop_front : 'a t -> 'a t Base.Option.t
val drop_front_exn : 'a t -> 'a t
val drop_back : 'a t -> 'a t Base.Option.t
val drop_back_exn : 'a t -> 'a t
val dequeue : 'a t -> [ `back | `front ] -> ('a * 'a t) Base.Option.t

dequeue t side produces Option.both (peek t side) (drop t side).

Complexity: amortized O(1), worst-case O(length t).

val dequeue_exn : 'a t -> [ `back | `front ] -> 'a * 'a t
val dequeue_front : 'a t -> ('a * 'a t) Base.Option.t
val dequeue_front_exn : 'a t -> 'a * 'a t
val dequeue_back : 'a t -> ('a * 'a t) Base.Option.t
val dequeue_back_exn : 'a t -> 'a * 'a t
module Stable : sig ... end