ocaml-base-compiler
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package ocaml-base-compiler
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Array operations

This module is intended to be used via StdLabels which replaces Array, Bytes, List and String with their labeled counterparts

For example:

open StdLabels

let everything = Array.create_matrix ~dimx:42 ~dimy:42 42
type 'a t = 'a array

An alias for the type of arrays.

val length : 'a array -> int

Return the length (number of elements) of the given array.

val get : 'a array -> int -> 'a

get a n returns the element number n of array a. The first element has number 0. The last element has number length a - 1. You can also write a.(n) instead of get a n.

  • raises Invalid_argument

    if n is outside the range 0 to (length a - 1).

val set : 'a array -> int -> 'a -> unit

set a n x modifies array a in place, replacing element number n with x. You can also write a.(n) <- x instead of set a n x.

  • raises Invalid_argument

    if n is outside the range 0 to length a - 1.

val make : int -> 'a -> 'a 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.

  • raises 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.

val create : int -> 'a -> 'a array
  • deprecated

    create is an alias for make.

val init : int -> f:(int -> 'a) -> 'a 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, init n ~f tabulates the results of f applied to the integers 0 to n-1.

  • raises 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 : dimx:int -> dimy:int -> 'a -> 'a 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).

  • raises 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 : dimx:int -> dimy:int -> 'a -> 'a array array
val append : 'a array -> 'a array -> 'a 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 append, but concatenates a list of arrays.

val sub : 'a array -> pos:int -> len:int -> 'a array

sub a ~pos ~len returns a fresh array of length len, containing the elements number pos to pos + len - 1 of array a.

  • raises Invalid_argument

    if pos and len do not designate a valid subarray of a; that is, if pos < 0, or len < 0, or pos + len > length a.

val copy : 'a array -> 'a array

copy a returns a copy of a, that is, a fresh array containing the same elements as a.

val fill : 'a array -> pos:int -> len:int -> 'a -> unit

fill a ~pos ~len x modifies the array a in place, storing x in elements number pos to pos + len - 1.

  • raises Invalid_argument

    if pos and len do not designate a valid subarray of a.

val blit : src:'a array -> src_pos:int -> dst:'a array -> dst_pos:int -> len:int -> unit

blit ~src ~src_pos ~dst ~dst_pos ~len copies len elements from array src, starting at element number src_pos, to array dst, starting at element number dst_pos. It works correctly even if src and dst are the same array, and the source and destination chunks overlap.

  • raises Invalid_argument

    if src_pos and len do not designate a valid subarray of src, or if dst_pos and len do not designate a valid subarray of dst.

val to_list : 'a array -> 'a list

to_list a returns the list of all the elements of a.

val of_list : 'a list -> 'a array

of_list l returns a fresh array containing the elements of l.

val iter : f:('a -> unit) -> 'a array -> unit

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.(length a - 1); ().

val map : f:('a -> 'b) -> 'a array -> 'b 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.(length a - 1) |].

val iteri : f:(int -> 'a -> unit) -> 'a array -> unit

Same as iter, but the function is applied to the index of the element as first argument, and the element itself as second argument.

val mapi : f:(int -> 'a -> 'b) -> 'a array -> 'b array

Same as 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 : f:('a -> 'b -> 'a) -> init:'a -> 'b array -> 'a

fold_left ~f ~init a computes f (... (f (f init a.(0)) a.(1)) ...) a.(n-1), where n is the length of the array a.

val fold_right : f:('b -> 'a -> 'a) -> 'b array -> init:'a -> 'a

fold_right ~f a ~init computes f a.(0) (f a.(1) ( ... (f a.(n-1) init) ...)), where n is the length of the array a.

Iterators on two arrays

val iter2 : f:('a -> 'b -> unit) -> 'a array -> 'b array -> unit

iter2 ~f a b applies function f to all the elements of a and b.

  • raises Invalid_argument

    if the arrays are not the same size.

  • since 4.05.0
val map2 : f:('a -> 'b -> 'c) -> 'a array -> 'b array -> 'c array

map2 ~f a b applies function f to all the elements of a and b, and builds an array with the results returned by f: [| f a.(0) b.(0); ...; f a.(length a - 1) b.(length b - 1)|].

  • raises Invalid_argument

    if the arrays are not the same size.

  • since 4.05.0

Array scanning

val exists : f:('a -> bool) -> 'a array -> bool

exists ~f [|a1; ...; an|] checks if at least one element of the array satisfies the predicate f. That is, it returns (f a1) || (f a2) || ... || (f an).

  • since 4.03.0
val for_all : f:('a -> bool) -> 'a array -> bool

for_all ~f [|a1; ...; an|] checks if all elements of the array satisfy the predicate f. That is, it returns (f a1) && (f a2) && ... && (f an).

  • since 4.03.0
val for_all2 : f:('a -> 'b -> bool) ->