Module Queue

module Queue: sig .. end

Core_queue is a wrapper around OCaml's standard Queue module that follows Core idioms and adds some functions.

Differences from the standard module: enqueue replaces push, add, and takes the queue first. dequeue replaces pop, take, takes the queue first, and returns an option rather than raising Empty. dequeue_exn is available if you want to raise Empty. iter takes a labeled argument. transfer's arguments are labeled.

type 'a t

include Binable.S1

include Container.S1

include Sexpable.S1

val create : unit -> 'a t

create () returns an empty queue.

val enqueue : 'a t -> 'a -> unit

enqueue t x adds x to the end of t.

val dequeue : 'a t -> 'a option

dequeue t returns None if t is empty, otherwise it removes and returns the front of t

val dequeue_exn : 'a t -> 'a

val peek : 'a t -> 'a option

peek t returns None if t is empty, otherwise it returns Some x where x is the front of t.

val peek_exn : 'a t -> 'a

val clear : 'a t -> unit

clear t discards all elements from t.

val copy : 'a t -> 'a t

copy t returns a copy of t.

val filter_inplace : 'a t -> f:('a -> bool) -> unit

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

val transfer : src:'a t -> dst:'a t -> unit

transfer ~src ~dst adds all of the elements of src to the end of dst, then clears src. It is equivalent to the sequence iter ~src ~f:(enqueue dst); clear src but runs in constant time.

val of_list : 'a list -> 'a t

of_list list returns a queue t with the elements of list in the same order as the elements of list (i.e. the first element of t is the first element of the list).

val partial_iter : 'a t -> f:('a -> [ `Continue | `Stop ]) -> unit

partial_iter t ~f iterates through t until f returns `Stop

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

val concat_map : 'a t -> f:('a -> 'b list) -> 'b t

val filter_map : 'a t -> f:('a -> 'b option) -> 'b t

val of_array : 'a array -> 'a t

val fold : 'a t -> init:'b -> f:('b -> 'a -> 'b) -> 'b

val to_list : 'a t -> 'a list

val singleton : 'a -> 'a t