package containers
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Functional queues (fifo)

Simple implementation of functional queues

  • since 1.3
type 'a sequence = ('a -> unit) -> unit
type 'a printer = Format.formatter -> 'a -> unit
type 'a klist = unit -> [ `Nil | `Cons of 'a * 'a klist ]
type 'a gen = unit -> 'a option
type +'a t

Queue containing elements of type 'a

val empty : 'a t
val is_empty : 'a t -> bool
val push : 'a -> 'a t -> 'a t

Push element at the end of the queue.

val snoc : 'a t -> 'a -> 'a t

Flip version of push.

val peek : 'a t -> 'a option

First element of the queue.

val peek_exn : 'a t -> 'a

Same as peek but

  • raises Invalid_argument

    if the queue is empty.

val pop : 'a t -> ('a * 'a t) option

Get and remove the first element.

val pop_exn : 'a t -> 'a * 'a t

Same as pop, but fails on empty queues.

  • raises Invalid_argument

    if the queue is empty.

val junk : 'a t -> 'a t

Remove first element. If the queue is empty, do nothing.

val append : 'a t -> 'a t -> 'a t

Append two queues. Elements from the second one come after elements of the first one. Linear in the size of the second queue.

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

Map values.

val rev : 'a t -> 'a t

Reverse the queue. Constant time.

val equal : ('a -> 'a -> bool) -> 'a t -> 'a t -> bool
module Infix : sig ... end
include module type of Infix
val (>|=) : 'a t -> ('a -> 'b) -> 'b t

Alias to map.

val (@) : 'a t -> 'a t -> 'a t

Alias to append.

val (<::) : 'a t -> 'a -> 'a t

Alias to snoc.

val length : 'a t -> int

Number of elements in the queue (linear in time).

val fold : ('b -> 'a -> 'b) -> 'b -> 'a t -> 'b
val iter : ('a -> unit) -> 'a t -> unit
val to_list : 'a t -> 'a list
val add_list : 'a t -> 'a list -> 'a t
val of_list : 'a list -> 'a t
val to_seq : 'a t -> 'a sequence
val add_seq : 'a t -> 'a sequence -> 'a t
val of_seq : 'a sequence -> 'a t
val to_klist : 'a t -> 'a klist
val add_klist : 'a t -> 'a klist -> 'a t
val of_klist : 'a klist -> 'a t
val of_gen : 'a gen -> 'a t
val add_gen : 'a t -> 'a gen -> 'a t
val to_gen : 'a t -> 'a gen

IO

val pp : ?sep:unit printer -> 'a printer -> 'a t printer