Module CCDeque

Imperative deque

This structure provides fast access to its front and back elements, with O(1) operations.

type 'a t

Contains 'a elements, queue in both ways

exception Empty
val create : unit -> 'a t

New deque.

val clear : _ t -> unit

Remove all elements.

since
0.13
val is_empty : 'a t -> bool

Is the deque empty?

val equal : eq:('a -> 'a -> bool) -> 'a t -> 'a t -> bool

equal a b checks whether a and b contain the same sequence of elements.

parameter eq

comparison function for elements.

since
0.13
val compare : cmp:('a -> 'a -> int) -> 'a t -> 'a t -> int

compare a b compares lexicographically a and b.

parameter cmp

comparison function for elements.

since
0.13
val length : 'a t -> int

Number of elements. Used to be linear time, now constant time.

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

Push value at the front.

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

Push value at the back.

val peek_front : 'a t -> 'a

First value.

raises Empty

if empty.

val peek_front_opt : 'a t -> 'a option

First value.

since
2.7
val peek_back : 'a t -> 'a

Last value.

raises Empty

if empty.

val peek_back_opt : 'a t -> 'a option

Last value.

since
2.7
val remove_back : 'a t -> unit

Remove last value. If the deque is empty do nothing

since
2.7
val remove_front : 'a t -> unit

Remove first value. If the deque is empty do nothing

since
2.7
val take_back : 'a t -> 'a

Take last value.

raises Empty

if empty.

val take_back_opt : 'a t -> 'a option

Take last value.

since
2.7
val take_front : 'a t -> 'a

Take first value.

raises Empty

if empty.

val take_front_opt : 'a t -> 'a option

Take first value.

since
2.7
val update_back : 'a t -> ('a -> 'a option) -> unit

Update last value. If the deque is empty do nothing. If the function returns None, remove last element; if it returns Some x, replace last element with x.

since
2.7
val update_front : 'a t -> ('a -> 'a option) -> unit

Update first value. If the deque is empty do nothing. Similar to update_back but for the first value.

since
2.7
val append_front : into:'a t -> 'a t -> unit

append_front ~into q adds all elements of q at the front of into. O(length q) in time.

since
0.13
val append_back : into:'a t -> 'a t -> unit

append_back ~into q adds all elements of q at the back of into. O(length q) in time.

since
0.13
val iter : ('a -> unit) -> 'a t -> unit

Iterate on elements.

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

Fold on elements.

since
0.13

Conversions

type 'a gen = unit -> 'a option
type 'a sequence = ('a -> unit) -> unit
val of_seq : 'a sequence -> 'a t

Create a deque from the sequence. Optional argument deque disappears, use add_seq_back instead.

since
0.13
val to_seq : 'a t -> 'a sequence

Iterate on the elements.

val of_gen : 'a gen -> 'a t

of_gen g makes a deque containing the elements of g.

since
0.13
val to_gen : 'a t -> 'a gen

Iterate on the elements of the deque.

since
0.13
val add_seq_front : 'a t -> 'a sequence -> unit

add_seq_front q seq adds elements of seq into the front of q, in reverse order. O(n) in time, where n is the number of elements to add.

since
0.13
val add_seq_back : 'a t -> 'a sequence -> unit

add_seq_back q seq adds elements of seq into the back of q, in order. O(n) in time, where n is the number of elements to add.

since
0.13
val copy : 'a t -> 'a t

Fresh copy, O(n) in time.

val of_list : 'a list -> 'a t

Conversion from list, in order.

since
0.13
val to_list : 'a t -> 'a list

List of elements, in order. Less efficient than to_rev_list.

since
0.13
val to_rev_list : 'a t -> 'a list

Efficient conversion to list, in reverse order.

since
0.13
val filter : ('a -> bool) -> 'a t -> 'a t

Filter into a new copy.

since
2.7
val filter_map : ('a -> 'b option) -> 'a t -> 'b t

Filter map into a new copy

since
2.7
val filter_in_place : 'a t -> ('a -> bool) -> unit

Keep only elements that satisfy the predicate.

since
2.7

print

type 'a printer = Format.formatter -> 'a -> unit
val pp : 'a printer -> 'a t printer

Print the elements.

since
0.13