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(***********************************************************************)
(* *)
(* Objective Caml *)
(* *)
(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 1996 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the GNU Library General Public License, with *)
(* the special exception on linking described in file ../LICENSE. *)
(* *)
(***********************************************************************)

(* $Id$ *)

(** Array operations. *)

external length : 'a array -> int = "%array_length"
(** Return the length (number of elements) of the given array. *)

external get : 'a array -> int -> 'a = "%array_safe_get"
(** [Array.get a n] returns the element number [n] of array [a].
The first element has number 0.
The last element has number [Array.length a - 1].
You can also write [a.(n)] instead of [Array.get a n].

Raise [Invalid_argument "index out of bounds"]
if [n] is outside the range 0 to [(Array.length a - 1)]. *)

external set : 'a array -> int -> 'a -> unit = "%array_safe_set"
(** [Array.set a n x] modifies array [a] in place, replacing
element number [n] with [x].
You can also write [a.(n) <- x] instead of [Array.set a n x].

Raise [Invalid_argument "index out of bounds"]
if [n] is outside the range 0 to [Array.length a - 1]. *)

external make : int -> 'a -> 'a array = "caml_make_vect"
(** [Array.make n x] returns a fresh array of length [n],
initialized with [x].
All the elements of this new array are initially
physically equal to [x] (in the sense of the [==] predicate).
Consequently, if [x] is mutable, it is shared among all elements
of the array, and modifying [x] through one of the array entries
will modify all other entries at the same time.

Raise [Invalid_argument] if [n < 0] or [n > Sys.max_array_length].
If the value of [x] is a floating-point number, then the maximum
size is only [Sys.max_array_length / 2].*)

external create : int -> 'a -> 'a array = "caml_make_vect"
(** @deprecated [Array.create] is an alias for {!Array.make}. *)

val init : int -> (int -> 'a) -> 'a array
(** [Array.init n f] returns a fresh array of length [n],
with element number [i] initialized to the result of [f i].
In other terms, [Array.init n f] tabulates the results of [f]
applied to the integers [0] to [n-1].

Raise [Invalid_argument] if [n < 0] or [n > Sys.max_array_length].
If the return type of [f] is [float], then the maximum
size is only [Sys.max_array_length / 2].*)

val make_matrix : int -> int -> 'a -> 'a array array
(** [Array.make_matrix dimx dimy e] returns a two-dimensional array
(an array of arrays) with first dimension [dimx] and
second dimension [dimy]. All the elements of this new matrix
are initially physically equal to [e].
The element ([x,y]) of a matrix [m] is accessed
with the notation [m.(x).(y)].

Raise [Invalid_argument] if [dimx] or [dimy] is negative or
greater than [Sys.max_array_length].
If the value of [e] is a floating-point number, then the maximum
size is only [Sys.max_array_length / 2]. *)

val create_matrix : int -> int -> 'a -> 'a array array
(** @deprecated [Array.create_matrix] is an alias for {!Array.make_matrix}. *)

val append : 'a array -> 'a array -> 'a array
(** [Array.append v1 v2] returns a fresh array containing the
concatenation of the arrays [v1] and [v2]. *)

val concat : 'a array list -> 'a array
(** Same as [Array.append], but concatenates a list of arrays. *)

val sub : 'a array -> int -> int -> 'a array
(** [Array.sub a start len] returns a fresh array of length [len],
containing the elements number [start] to [start + len - 1]
of array [a].

Raise [Invalid_argument "Array.sub"] if [start] and [len] do not
designate a valid subarray of [a]; that is, if
[start < 0], or [len < 0], or [start + len > Array.length a]. *)

val copy : 'a array -> 'a array
(** [Array.copy a] returns a copy of [a], that is, a fresh array
containing the same elements as [a]. *)

val fill : 'a array -> int -> int -> 'a -> unit
(** [Array.fill a ofs len x] modifies the array [a] in place,
storing [x] in elements number [ofs] to [ofs + len - 1].

Raise [Invalid_argument "Array.fill"] if [ofs] and [len] do not
designate a valid subarray of [a]. *)

val blit : 'a array -> int -> 'a array -> int -> int -> unit
(** [Array.blit v1 o1 v2 o2 len] copies [len] elements
from array [v1], starting at element number [o1], to array [v2],
starting at element number [o2]. It works correctly even if
[v1] and [v2] are the same array, and the source and
destination chunks overlap.

Raise [Invalid_argument "Array.blit"] if [o1] and [len] do not
designate a valid subarray of [v1], or if [o2] and [len] do not
designate a valid subarray of [v2]. *)

val to_list : 'a array -> 'a list
(** [Array.to_list a] returns the list of all the elements of [a]. *)

val of_list : 'a list -> 'a array
(** [Array.of_list l] returns a fresh array containing the elements
of [l]. *)

val iter : ('a -> unit) -> 'a array -> unit
(** [Array.iter f a] applies function [f] in turn to all
the elements of [a]. It is equivalent to
[f a.(0); f a.(1); ...; f a.(Array.length a - 1); ()]. *)

val map : ('a -> 'b) -> 'a array -> 'b array
(** [Array.map f a] applies function [f] to all the elements of [a],
and builds an array with the results returned by [f]:
[[| f a.(0); f a.(1); ...; f a.(Array.length a - 1) |]]. *)

val iteri : (int -> 'a -> unit) -> 'a array -> unit
(** Same as {!Array.iter}, but the
function is applied to the index of the element as first argument,
and the element itself as second argument. *)

val mapi : (int -> 'a -> 'b) -> 'a array -> 'b array
(** Same as {!Array.map}, but the
function is applied to the index of the element as first argument,
and the element itself as second argument. *)

val fold_left : ('a -> 'b -> 'a) -> 'a -> 'b array -> 'a
(** [Array.fold_left f x a] computes
[f (... (f (f x a.(0)) a.(1)) ...) a.(n-1)],
where [n] is the length of the array [a]. *)

val fold_right : ('b -> 'a -> 'a) -> 'b array -> 'a -> 'a
(** [Array.fold_right f a x] computes
[f a.(0) (f a.(1) ( ... (f a.(n-1) x) ...))],
where [n] is the length of the array [a]. *)


(** {6 Sorting} *)


val sort : ('a -> 'a -> int) -> 'a array -> unit
(** Sort an array in increasing order according to a comparison
function. The comparison function must return 0 if its arguments
compare as equal, a positive integer if the first is greater,
and a negative integer if the first is smaller (see below for a
complete specification). For example, {!Pervasives.compare} is
a suitable comparison function, provided there are no floating-point
NaN values in the data. After calling [Array.sort], the
array is sorted in place in increasing order.
[Array.sort] is guaranteed to run in constant heap space
and (at most) logarithmic stack space.

The current implementation uses Heap Sort. It runs in constant
stack space.

Specification of the comparison function:
Let [a] be the array and [cmp] the comparison function. The following
must be true for all x, y, z in a :
- [cmp x y] > 0 if and only if [cmp y x] < 0
- if [cmp x y] >= 0 and [cmp y z] >= 0 then [cmp x z] >= 0

When [Array.sort] returns, [a] contains the same elements as before,
reordered in such a way that for all i and j valid indices of [a] :
- [cmp a.(i) a.(j)] >= 0 if and only if i >= j
*)

val stable_sort : ('a -> 'a -> int) -> 'a array -> unit
(** Same as {!Array.sort}, but the sorting algorithm is stable (i.e.
elements that compare equal are kept in their original order) and
not guaranteed to run in constant heap space.

The current implementation uses Merge Sort. It uses [n/2]
words of heap space, where [n] is the length of the array.
It is usually faster than the current implementation of {!Array.sort}.
*)

val fast_sort : ('a -> 'a -> int) -> 'a array -> unit
(** Same as {!Array.sort} or {!Array.stable_sort}, whichever is faster
on typical input.
*)


(**/**)
(** {6 Undocumented functions} *)

external unsafe_get : 'a array -> int -> 'a = "%array_unsafe_get"
external unsafe_set : 'a array -> int -> 'a -> unit = "%array_unsafe_set"
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