mirror of
https://github.com/c-cube/ocaml-containers.git
synced 2025-12-06 03:05:28 -05:00
140 lines
4.2 KiB
OCaml
140 lines
4.2 KiB
OCaml
(*
|
|
Copyright (c) 2013, Simon Cruanes
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
Redistributions of source code must retain the above copyright notice, this
|
|
list of conditions and the following disclaimer. Redistributions in binary
|
|
form must reproduce the above copyright notice, this list of conditions and the
|
|
following disclaimer in the documentation and/or other materials provided with
|
|
the distribution.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
|
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*)
|
|
|
|
(** {1 Functional queues} *)
|
|
|
|
type 'a sequence = ('a -> unit) -> unit
|
|
type 'a klist = unit -> [`Nil | `Cons of 'a * 'a klist]
|
|
type 'a equal = 'a -> 'a -> bool
|
|
|
|
(** {2 Basics} *)
|
|
|
|
type +'a t
|
|
(** Queue containing elements of type 'a *)
|
|
|
|
val empty : 'a t
|
|
|
|
val is_empty : 'a t -> bool
|
|
|
|
val singleton : 'a -> 'a t
|
|
|
|
val doubleton : 'a -> 'a -> 'a t
|
|
|
|
exception Empty
|
|
|
|
val cons : 'a -> 'a t -> 'a t
|
|
(** Push element at the front of the queue *)
|
|
|
|
val snoc : 'a t -> 'a -> 'a t
|
|
(** Push element at the end of the queue *)
|
|
|
|
val take_front : 'a t -> ('a * 'a t) option
|
|
(** Get and remove the first element *)
|
|
|
|
val take_front_exn : 'a t -> ('a * 'a t)
|
|
(** Same as {!take_front}, but fails on empty queues.
|
|
@raise Empty if the queue is empty *)
|
|
|
|
val take_front_l : int -> 'a t -> 'a list * 'a t
|
|
(** [take_front_l n q] takes at most [n] elements from the front
|
|
of [q], and returns them wrapped in a list *)
|
|
|
|
val take_front_while : ('a -> bool) -> 'a t -> 'a list * 'a t
|
|
|
|
val take_back : 'a t -> ('a t * 'a) option
|
|
(** Take last element *)
|
|
|
|
val take_back_exn : 'a t -> ('a t * 'a)
|
|
|
|
val take_back_l : int -> 'a t -> 'a t * 'a list
|
|
(** [take_back_l n q] removes and returns the last [n] elements of [q]. The
|
|
elements are in the order of the queue, that is, the head of the returned
|
|
list is the first element to appear via {!take_front}.
|
|
[take_back_l 2 (of_list [1;2;3;4]) = of_list [1;2], [3;4]] *)
|
|
|
|
val take_back_while : ('a -> bool) -> 'a t -> 'a t * 'a list
|
|
|
|
(** {2 Individual extraction} *)
|
|
|
|
val first : 'a t -> 'a option
|
|
(** First element of the queue *)
|
|
|
|
val last : 'a t -> 'a option
|
|
(** Last element of the queue *)
|
|
|
|
val first_exn : 'a t -> 'a
|
|
(** Same as {!peek} but
|
|
@raise Empty if the queue is empty *)
|
|
|
|
val last_exn : 'a t -> 'a
|
|
|
|
val nth : int -> 'a t -> 'a option
|
|
(** Return the [i]-th element of the queue in logarithmic time *)
|
|
|
|
val nth_exn : int -> 'a t -> 'a
|
|
(** Unsafe version of {!nth}
|
|
@raise Not_found if the index is wrong *)
|
|
|
|
val tail : 'a t -> 'a t
|
|
(** Queue deprived of its first element. Does nothing on empty queues *)
|
|
|
|
val init : 'a t -> 'a t
|
|
(** Queue deprived of its last element. Does nothing on empty queues *)
|
|
|
|
(** {2 Global Operations} *)
|
|
|
|
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 (>|=) : 'a t -> ('a -> 'b) -> 'b t
|
|
|
|
val size : 'a t -> int
|
|
(** Number of elements in the queue (constant time) *)
|
|
|
|
val fold : ('b -> 'a -> 'b) -> 'b -> 'a t -> 'b
|
|
|
|
val iter : ('a -> unit) -> 'a t -> unit
|
|
|
|
val equal : 'a equal -> 'a t equal
|
|
|
|
(** {2 Conversions} *)
|
|
|
|
val of_list : 'a list -> 'a t
|
|
val to_list : 'a t -> 'a list
|
|
|
|
val add_seq_front : 'a sequence -> 'a t -> 'a t
|
|
val add_seq_back : 'a t -> 'a sequence -> 'a t
|
|
|
|
val to_seq : 'a t -> 'a sequence
|
|
val of_seq : 'a sequence -> 'a t
|
|
|
|
val to_klist : 'a t -> 'a klist
|
|
val of_klist : 'a klist -> 'a t
|
|
|