260 lines
11 KiB
OCaml
260 lines
11 KiB
OCaml
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(**************************************************************************)
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(* *)
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(* OCaml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* en Automatique. *)
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(* *)
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(* All rights reserved. This file is distributed under the terms of *)
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(* the GNU Lesser General Public License version 2.1, with the *)
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(* special exception on linking described in the file LICENSE. *)
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(* *)
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(**************************************************************************)
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(** Array operations. *)
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external length : 'a array -> int = "%array_length"
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(** Return the length (number of elements) of the given array. *)
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external get : 'a array -> int -> 'a = "%array_safe_get"
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(** [Array.get a n] returns the element number [n] of array [a].
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The first element has number 0.
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The last element has number [Array.length a - 1].
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You can also write [a.(n)] instead of [Array.get a n].
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Raise [Invalid_argument "index out of bounds"]
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if [n] is outside the range 0 to [(Array.length a - 1)]. *)
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external set : 'a array -> int -> 'a -> unit = "%array_safe_set"
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(** [Array.set a n x] modifies array [a] in place, replacing
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element number [n] with [x].
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You can also write [a.(n) <- x] instead of [Array.set a n x].
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Raise [Invalid_argument "index out of bounds"]
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if [n] is outside the range 0 to [Array.length a - 1]. *)
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external make : int -> 'a -> 'a array = "caml_make_vect"
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(** [Array.make n x] returns a fresh array of length [n],
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initialized with [x].
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All the elements of this new array are initially
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physically equal to [x] (in the sense of the [==] predicate).
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Consequently, if [x] is mutable, it is shared among all elements
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of the array, and modifying [x] through one of the array entries
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will modify all other entries at the same time.
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Raise [Invalid_argument] if [n < 0] or [n > Sys.max_array_length].
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If the value of [x] is a floating-point number, then the maximum
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size is only [Sys.max_array_length / 2].*)
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external create : int -> 'a -> 'a array = "caml_make_vect"
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[@@ocaml.deprecated "Use Array.make instead."]
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(** @deprecated [Array.create] is an alias for {!Array.make}. *)
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external create_float: int -> float array = "caml_make_float_vect"
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(** [Array.create_float n] returns a fresh float array of length [n],
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with uninitialized data.
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@since 4.03 *)
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val make_float: int -> float array
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[@@ocaml.deprecated "Use Array.create_float instead."]
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(** @deprecated [Array.make_float] is an alias for {!Array.create_float}. *)
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val init : int -> (int -> 'a) -> 'a array
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(** [Array.init n f] returns a fresh array of length [n],
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with element number [i] initialized to the result of [f i].
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In other terms, [Array.init n f] tabulates the results of [f]
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applied to the integers [0] to [n-1].
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Raise [Invalid_argument] if [n < 0] or [n > Sys.max_array_length].
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If the return type of [f] is [float], then the maximum
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size is only [Sys.max_array_length / 2].*)
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val make_matrix : int -> int -> 'a -> 'a array array
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(** [Array.make_matrix dimx dimy e] returns a two-dimensional array
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(an array of arrays) with first dimension [dimx] and
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second dimension [dimy]. All the elements of this new matrix
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are initially physically equal to [e].
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The element ([x,y]) of a matrix [m] is accessed
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with the notation [m.(x).(y)].
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Raise [Invalid_argument] if [dimx] or [dimy] is negative or
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greater than [Sys.max_array_length].
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If the value of [e] is a floating-point number, then the maximum
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size is only [Sys.max_array_length / 2]. *)
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val create_matrix : int -> int -> 'a -> 'a array array
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[@@ocaml.deprecated "Use Array.make_matrix instead."]
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(** @deprecated [Array.create_matrix] is an alias for {!Array.make_matrix}. *)
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val append : 'a array -> 'a array -> 'a array
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(** [Array.append v1 v2] returns a fresh array containing the
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concatenation of the arrays [v1] and [v2]. *)
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val concat : 'a array list -> 'a array
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(** Same as [Array.append], but concatenates a list of arrays. *)
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val sub : 'a array -> int -> int -> 'a array
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(** [Array.sub a start len] returns a fresh array of length [len],
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containing the elements number [start] to [start + len - 1]
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of array [a].
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Raise [Invalid_argument "Array.sub"] if [start] and [len] do not
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designate a valid subarray of [a]; that is, if
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[start < 0], or [len < 0], or [start + len > Array.length a]. *)
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val copy : 'a array -> 'a array
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(** [Array.copy a] returns a copy of [a], that is, a fresh array
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containing the same elements as [a]. *)
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val fill : 'a array -> int -> int -> 'a -> unit
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(** [Array.fill a ofs len x] modifies the array [a] in place,
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storing [x] in elements number [ofs] to [ofs + len - 1].
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Raise [Invalid_argument "Array.fill"] if [ofs] and [len] do not
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designate a valid subarray of [a]. *)
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val blit : 'a array -> int -> 'a array -> int -> int -> unit
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(** [Array.blit v1 o1 v2 o2 len] copies [len] elements
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from array [v1], starting at element number [o1], to array [v2],
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starting at element number [o2]. It works correctly even if
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[v1] and [v2] are the same array, and the source and
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destination chunks overlap.
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Raise [Invalid_argument "Array.blit"] if [o1] and [len] do not
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designate a valid subarray of [v1], or if [o2] and [len] do not
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designate a valid subarray of [v2]. *)
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val to_list : 'a array -> 'a list
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(** [Array.to_list a] returns the list of all the elements of [a]. *)
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val of_list : 'a list -> 'a array
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(** [Array.of_list l] returns a fresh array containing the elements
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of [l]. *)
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(** {6 Iterators} *)
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val iter : ('a -> unit) -> 'a array -> unit
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(** [Array.iter f a] applies function [f] in turn to all
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the elements of [a]. It is equivalent to
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[f a.(0); f a.(1); ...; f a.(Array.length a - 1); ()]. *)
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val iteri : (int -> 'a -> unit) -> 'a array -> unit
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(** Same as {!Array.iter}, but the
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function is applied with the index of the element as first argument,
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and the element itself as second argument. *)
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val map : ('a -> 'b) -> 'a array -> 'b array
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(** [Array.map f a] applies function [f] to all the elements of [a],
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and builds an array with the results returned by [f]:
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[[| f a.(0); f a.(1); ...; f a.(Array.length a - 1) |]]. *)
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val mapi : (int -> 'a -> 'b) -> 'a array -> 'b array
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(** Same as {!Array.map}, but the
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function is applied to the index of the element as first argument,
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and the element itself as second argument. *)
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val fold_left : ('a -> 'b -> 'a) -> 'a -> 'b array -> 'a
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(** [Array.fold_left f x a] computes
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[f (... (f (f x a.(0)) a.(1)) ...) a.(n-1)],
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where [n] is the length of the array [a]. *)
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val fold_right : ('b -> 'a -> 'a) -> 'b array -> 'a -> 'a
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(** [Array.fold_right f a x] computes
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[f a.(0) (f a.(1) ( ... (f a.(n-1) x) ...))],
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where [n] is the length of the array [a]. *)
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(** {6 Iterators on two arrays} *)
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val iter2 : ('a -> 'b -> unit) -> 'a array -> 'b array -> unit
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(** [Array.iter2 f a b] applies function [f] to all the elements of [a]
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and [b].
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Raise [Invalid_argument] if the arrays are not the same size. *)
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val map2 : ('a -> 'b -> 'c) -> 'a array -> 'b array -> 'c array
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(** [Array.map2 f a b] applies function [f] to all the elements of [a]
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and [b], and builds an array with the results returned by [f]:
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[[| f a.(0) b.(0); ...; f a.(Array.length a - 1) b.(Array.length b - 1)|]].
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Raise [Invalid_argument] if the arrays are not the same size. *)
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(** {6 Array scanning} *)
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val for_all : ('a -> bool) -> 'a array -> bool
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(** [Array.for_all p [|a1; ...; an|]] checks if all elements of the array
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satisfy the predicate [p]. That is, it returns
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[(p a1) && (p a2) && ... && (p an)]. *)
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val exists : ('a -> bool) -> 'a array -> bool
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(** [Array.exists p [|a1; ...; an|]] checks if at least one element of
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the array satisfies the predicate [p]. That is, it returns
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[(p a1) || (p a2) || ... || (p an)]. *)
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val mem : 'a -> 'a array -> bool
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(** [mem a l] is true if and only if [a] is equal
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to an element of [l]. *)
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val memq : 'a -> 'a array -> bool
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(** Same as {!Array.mem}, but uses physical equality instead of structural
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equality to compare array elements. *)
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(** {6 Sorting} *)
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val sort : ('a -> 'a -> int) -> 'a array -> unit
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(** Sort an array in increasing order according to a comparison
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function. The comparison function must return 0 if its arguments
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compare as equal, a positive integer if the first is greater,
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and a negative integer if the first is smaller (see below for a
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complete specification). For example, {!Pervasives.compare} is
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a suitable comparison function, provided there are no floating-point
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NaN values in the data. After calling [Array.sort], the
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array is sorted in place in increasing order.
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[Array.sort] is guaranteed to run in constant heap space
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and (at most) logarithmic stack space.
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The current implementation uses Heap Sort. It runs in constant
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stack space.
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Specification of the comparison function:
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Let [a] be the array and [cmp] the comparison function. The following
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must be true for all x, y, z in a :
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- [cmp x y] > 0 if and only if [cmp y x] < 0
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- if [cmp x y] >= 0 and [cmp y z] >= 0 then [cmp x z] >= 0
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When [Array.sort] returns, [a] contains the same elements as before,
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reordered in such a way that for all i and j valid indices of [a] :
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- [cmp a.(i) a.(j)] >= 0 if and only if i >= j
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*)
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val stable_sort : ('a -> 'a -> int) -> 'a array -> unit
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(** Same as {!Array.sort}, but the sorting algorithm is stable (i.e.
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elements that compare equal are kept in their original order) and
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not guaranteed to run in constant heap space.
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The current implementation uses Merge Sort. It uses [n/2]
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words of heap space, where [n] is the length of the array.
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It is usually faster than the current implementation of {!Array.sort}.
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*)
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val fast_sort : ('a -> 'a -> int) -> 'a array -> unit
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(** Same as {!Array.sort} or {!Array.stable_sort}, whichever is faster
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on typical input.
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*)
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(**/**)
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(** {6 Undocumented functions} *)
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(* The following is for system use only. Do not call directly. *)
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external unsafe_get : 'a array -> int -> 'a = "%array_unsafe_get"
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external unsafe_set : 'a array -> int -> 'a -> unit = "%array_unsafe_set"
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