Up

Module Fdeque

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.

Signature

type 'a t
val t_of_sexp : (Sexplib.Sexp.t -> 'a) -> Sexplib.Sexp.t -> 'a t
val sexp_of_t : ('a -> Sexplib.Sexp.t) -> 'a t -> Sexplib.Sexp.t
val compare : ('a -> 'a -> int) -> 'a t -> 'a t -> int
val bin_read_t : 'a Bin_prot.Read.reader -> 'a t Bin_prot.Read.reader
val __bin_read_t__ : 'a Bin_prot.Read.reader -> (int -> '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
include Container.S1 with type 'a t := 'a t
type 'a t
val mem : ?equal:('a -> 'a -> bool) -> 'a t -> 'a -> bool

Checks whether the provided element is there, using polymorphic compare if equal is not provided

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

Returns the sum of f i for 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 -> cmp:('a -> 'a -> int) -> 'a option

Returns a minimum (resp maximum) element from the collection using the provided cmp 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 -> cmp:('a -> 'a -> int) -> 'a option
include Invariant.S1 with type 'a t := 'a t
type 'a t
val invariant : 'a Invariant_intf.inv -> 'a t Invariant_intf.inv
module Arbitrary_order : sig .. end
Traverse deque elements in arbitrary order.
module Front_to_back : sig .. end
Traverse deque elements front-to-back.
module Back_to_front : sig .. end
Traverse deque elements back-to-front.
val empty : _ t

The empty deque.

val singleton : 'a -> 'a t

A one-element deque.

val of_list : 'a list -> '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 option

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 option
val peek_front_exn : 'a t -> 'a
val peek_back : 'a t -> 'a option
val peek_back_exn : 'a t -> 'a
val drop : 'a t -> [
| `back
| `front
] -> 'a t option

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 option
val drop_front_exn : 'a t -> 'a t
val drop_back : 'a t -> 'a t option
val drop_back_exn : 'a t -> 'a t
val dequeue : 'a t -> [
| `back
| `front
] -> ('a * 'a t) option

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) option
val dequeue_front_exn : 'a t -> 'a * 'a t
val dequeue_back : 'a t -> ('a * 'a t) option
val dequeue_back_exn : 'a t -> 'a * 'a t
module Stable : sig .. end