package fmlib

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A double ended queue. Insert from both ends, pop only from the front.

type _ t

'a t A double ended queue with element type 'a.

val is_empty : _ t -> bool

is_empty q Is the queue q empty?

val has_some : _ t -> bool

has_some q Does the queue have elements?

val empty : _ t

empty The empty queue.

val push_front : 'a -> 'a t -> 'a t

push_front e q Push the element e to the front of the queue q.

val push_rear : 'a -> 'a t -> 'a t

push_rear e q Push the element e to the rear of the queue q.

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

pop_front q Pop the front element.

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

update_first f q Update the first element of the queue q with the update function f.

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

update_last f q Update the last element of the queue q with the update function f.

val to_list : 'a t -> 'a list

to_list q Convert the queue q to a list.