Array (docs.findlib-1.base.Base.Array)

type 'a t = 'a array

val compare : ('a -> 'a -> int) -> 'a t -> 'a t -> int

val globalize : ('a -> 'a) -> 'a t -> 'a t

include Sexplib0.Sexpable.S1 with type 'a t := 'a t

val t_of_sexp : (Sexplib0.Sexp.t -> 'a) -> Sexplib0.Sexp.t -> 'a t

val sexp_of_t : ('a -> Sexplib0.Sexp.t) -> 'a t -> Sexplib0.Sexp.t

val t_sexp_grammar : 'a Sexplib0.Sexp_grammar.t -> 'a t Sexplib0.Sexp_grammar.t

include Binary_searchable.S1 with type 'a t := 'a t

val binary_search : 
  ?pos:int ->
  ?len:int ->
  'a t ->
  compare:('a -> 'key -> int) ->
  [ `Last_strictly_less_than
  | `Last_less_than_or_equal_to
  | `Last_equal_to
  | `First_equal_to
  | `First_greater_than_or_equal_to
  | `First_strictly_greater_than ] ->
  'key ->
  int option

val binary_search_segmented : 
  ?pos:int ->
  ?len:int ->
  'a t ->
  segment_of:('a -> [ `Left | `Right ]) ->
  [ `Last_on_left | `First_on_right ] ->
  int option

include Indexed_container.S1_with_creators with type 'a t := 'a t

include Container.S1_with_creators with type 'a t := 'a t

val of_list : 'a list -> 'a t

val of_array : 'a array -> 'a t

val append : 'a t -> 'a t -> 'a t

E.g., append (of_list [1; 2]) (of_list [3; 4; 5]) is of_list [1; 2; 3; 4; 5]

val map : 'a t -> f:('a -> 'b) -> 'b t

map f (of_list [a1; ...; an]) applies f to a1, a2, ..., an, in order, and builds a result equivalent to of_list [f a1; ...; f an].

val filter : 'a t -> f:('a -> bool) -> 'a t

filter t ~f returns all the elements of t that satisfy the predicate f.

val filter_map : 'a t -> f:('a -> 'b option) -> 'b t

filter_map t ~f applies f to every x in t. The result contains every y for which f x returns Some y.

val concat_map : 'a t -> f:('a -> 'b t) -> 'b t

concat_map t ~f is equivalent to concat (map t ~f).

val partition_tf : 'a t -> f:('a -> bool) -> 'a t * 'a t

partition_tf t ~f returns a pair t1, t2, where t1 is all elements of t that satisfy f, and t2 is all elements of t that do not satisfy f. The "tf" suffix is mnemonic to remind readers that the result is (trues, falses).

val partition_map : 'a t -> f:('a -> ('b, 'c) Base__.Either0.t) -> 'b t * 'c t

partition_map t ~f partitions t according to f.

include Container.S1 with type 'a t := 'a t

val mem : 'a t -> 'a -> equal:('a -> 'a -> bool) -> bool

Checks whether the provided element is there, using equal.

val is_empty : 'a t -> bool

val iter : 'a t -> f:('a -> unit) -> unit

val fold : 'a t -> init:'acc -> f:('acc -> 'a -> 'acc) -> 'acc

fold t ~init ~f returns f (... f (f (f init e1) e2) e3 ...) en, where e1..en are the elements of t

val fold_result : 
  'a t ->
  init:'acc ->
  f:('acc -> 'a -> ('acc, 'e) Result.t) ->
  ('acc, 'e) Result.t

fold_result t ~init ~f is a short-circuiting version of fold that runs in the Result monad. If f returns an Error _, that value is returned without any additional invocations of f.

val fold_until : 
  'a t ->
  init:'acc ->
  f:('acc -> 'a -> ('acc, 'final) Container.Continue_or_stop.t) ->
  finish:('acc -> 'final) ->
  'final

fold_until t ~init ~f ~finish is a short-circuiting version of fold. If f returns Stop _ the computation ceases and results in that value. If f returns Continue _, the fold will proceed. If f never returns Stop _, the final result is computed by finish.

Example:

type maybe_negative =
  | Found_negative of int
  | All_nonnegative of { sum : int }

(** [first_neg_or_sum list] returns the first negative number in [list], if any,
    otherwise returns the sum of the list. *)
let first_neg_or_sum =
  List.fold_until ~init:0
    ~f:(fun sum x ->
      if x < 0
      then Stop (Found_negative x)
      else Continue (sum + x))
    ~finish:(fun sum -> All_nonnegative { sum })
;;

let x = first_neg_or_sum [1; 2; 3; 4; 5]
val x : maybe_negative = All_nonnegative {sum = 15}

let y = first_neg_or_sum [1; 2; -3; 4; 5]
val y : maybe_negative = Found_negative -3

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 Container.Summable with type t = 'sum) ->
  'a t ->
  f:('a -> 'sum) ->
  'sum

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

Returns a minimum (resp maximum) element from the collection using the provided compare 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 -> compare:('a -> 'a -> int) -> 'a option

These are all like their equivalents in Container except that an index starting at 0 is added as the first argument to f.

val foldi : 'a t -> init:_ -> f:(int -> _ -> 'a -> _) -> _

val iteri : 'a t -> f:(int -> 'a -> unit) -> unit

val existsi : 'a t -> f:(int -> 'a -> bool) -> bool

val for_alli : 'a t -> f:(int -> 'a -> bool) -> bool

val counti : 'a t -> f:(int -> 'a -> bool) -> int

val findi : 'a t -> f:(int -> 'a -> bool) -> (int * 'a) option

val find_mapi : 'a t -> f:(int -> 'a -> 'b option) -> 'b option

val init : int -> f:(int -> 'a) -> 'a t

init n ~f is equivalent to of_list [f 0; f 1; ...; f (n-1)]. It raises an exception if n < 0.

val mapi : 'a t -> f:(int -> 'a -> 'b) -> 'b t

mapi is like map. Additionally, it passes in the index of each element as the first argument to the mapped function.

val filteri : 'a t -> f:(int -> 'a -> bool) -> 'a t

val filter_mapi : 'a t -> f:(int -> 'a -> 'b option) -> 'b t

filter_mapi is like filter_map. Additionally, it passes in the index of each element as the first argument to the mapped function.

val concat_mapi : 'a t -> f:(int -> 'a -> 'b t) -> 'b t

concat_mapi t ~f is like concat_map. Additionally, it passes the index as an argument.

include Invariant.S1 with type 'a t := 'a t

val invariant : ('a -> unit) -> 'a t -> unit

val max_length : int

Maximum length of a normal array. The maximum length of a float array is max_length/2 on 32-bit machines and max_length on 64-bit machines.

val length : 'a t -> int

val get : 'a t -> int -> 'a

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).

val set : 'a t -> int -> 'a -> unit

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.

val unsafe_get : 'a t -> int -> 'a

Unsafe version of get. Can cause arbitrary behavior when used for an out-of-bounds array access.

val unsafe_set : 'a t -> int -> 'a -> unit

Unsafe version of set. Can cause arbitrary behavior when used for an out-of-bounds array access.

val create : len:int -> 'a -> 'a t

create ~len x creates an array of length len with the value x populated in each element.

val create_local : len:int -> 'a -> 'a t

create_local ~len x is like create. It allocates the array on the local stack. The array's elements are still global.

val create_float_uninitialized : len:int -> float t

create_float_uninitialized ~len creates a float array of length len with uninitialized elements -- that is, they may contain arbitrary, nondeterministic float values. This can be significantly faster than using create, when unboxed float array representations are enabled.

val make_matrix : dimx:int -> dimy:int -> 'a -> 'a t t

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 Array.max_length.

If the value of e is a floating-point number, then the maximum size is only Array.max_length / 2.

val copy_matrix : 'a t t -> 'a t t

Array.copy_matrix t returns a fresh copy of the array of arrays t. This is typically used when t is a matrix created by Array.make_matrix.

val concat : 'a t list -> 'a t

Like Array.append, but concatenates a list of arrays.

val copy : 'a t -> 'a t

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

val fill : 'a t -> pos:int -> len: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.

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.

int_blit and float_blit provide fast bound-checked blits for immediate data types. The unsafe versions do not bound-check the arguments.

include Blit.S1 with type 'a t := 'a t

val blit : 
  src:'a t ->
  src_pos:int ->
  dst:'a t ->
  dst_pos:int ->
  len:int ->
  unit

val blito : 
  src:'a t ->
  ?src_pos:int ->
  ?src_len:int ->
  dst:'a t ->
  ?dst_pos:int ->
  unit ->
  unit

val unsafe_blit : 
  src:'a t ->
  src_pos:int ->
  dst:'a t ->
  dst_pos:int ->
  len:int ->
  unit

val sub : 'a t -> pos:int -> len:int -> 'a t

val subo : ?pos:int -> ?len:int -> 'a t -> 'a t

val folding_map : 'a t -> init:'acc -> f:('acc -> 'a -> 'acc * 'b) -> 'b t

folding_map is a version of map that threads an accumulator through calls to f.

val folding_mapi : 
  'a t ->
  init:'acc ->
  f:(int -> 'acc -> 'a -> 'acc * 'b) ->
  'b t

val fold_map : 'a t -> init:'acc -> f:('acc -> 'a -> 'acc * 'b) -> 'acc * 'b t

Array.fold_map is a combination of Array.fold and Array.map that threads an accumulator through calls to f.

val fold_mapi : 
  'a t ->
  init:'acc ->
  f:(int -> 'acc -> 'a -> 'acc * 'b) ->
  'acc * 'b t

val fold_right : 'a t -> f:('a -> 'acc -> 'acc) -> init:'acc -> 'acc

Array.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.

All sort functions in this module sort in increasing order by default.

val sort : ?pos:int -> ?len:int -> 'a t -> compare:('a -> 'a -> int) -> unit

sort uses constant heap space. stable_sort uses linear heap space.

To sort only part of the array, specify pos to be the index to start sorting from and len indicating how many elements to sort.

val stable_sort : 'a t -> compare:('a -> 'a -> int) -> unit

val is_sorted : 'a t -> compare:('a -> 'a -> int) -> bool

val is_sorted_strictly : 'a t -> compare:('a -> 'a -> int) -> bool

is_sorted_strictly xs ~compare iff is_sorted xs ~compare and no two consecutive elements in xs are equal according to compare.

val merge : 'a t -> 'a t -> compare:('a -> 'a -> int) -> 'a t

Merges two arrays: assuming that a1 and a2 are sorted according to the comparison function compare, merge a1 a2 ~compare will return a sorted array containing all the elements of a1 and a2. If several elements compare equal, the elements of a1 will be before the elements of a2.

val partitioni_tf : 'a t -> f:(int -> 'a -> bool) -> 'a t * 'a t

val cartesian_product : 'a t -> 'b t -> ('a * 'b) t

val transpose : 'a t t -> 'a t t option

transpose in the sense of a matrix transpose. It returns None if the arrays are not all the same length.

val transpose_exn : 'a t t -> 'a t t

val filter_opt : 'a option t -> 'a t

filter_opt array returns a new array where None entries are omitted and Some x entries are replaced with x. Note that this changes the index at which elements will appear.

Functions with the 2 suffix raise an exception if the lengths of the two given arrays aren't the same.

val iter2_exn : 'a t -> 'b t -> f:('a -> 'b -> unit) -> unit

val map2_exn : 'a t -> 'b t -> f:('a -> 'b -> 'c) -> 'c t

val fold2_exn : 
  'a t ->
  'b t ->
  init:'acc ->
  f:('acc -> 'a -> 'b -> 'acc) ->
  'acc

val for_all2_exn : 'a t -> 'b t -> f:('a -> 'b -> bool) -> bool

for_all2_exn t1 t2 ~f fails if length t1 <> length t2.

val exists2_exn : 'a t -> 'b t -> f:('a -> 'b -> bool) -> bool

exists2_exn t1 t2 ~f fails if length t1 <> length t2.

val swap : 'a t -> int -> int -> unit

swap arr i j swaps the value at index i with that at index j.

val rev_inplace : 'a t -> unit

rev_inplace t reverses t in place.

val rev : 'a t -> 'a t

rev t returns a reversed copy of t

val of_list_rev : 'a list -> 'a t

of_list_rev l converts from list then reverses in place.

val of_list_map : 'a list -> f:('a -> 'b) -> 'b t

of_list_map l ~f is the same as of_list (List.map l ~f).

val of_list_mapi : 'a list -> f:(int -> 'a -> 'b) -> 'b t

of_list_mapi l ~f is the same as of_list (List.mapi l ~f).

val of_list_rev_map : 'a list -> f:('a -> 'b) -> 'b t

of_list_rev_map l ~f is the same as of_list (List.rev_map l ~f).

val of_list_rev_mapi : 'a list -> f:(int -> 'a -> 'b) -> 'b t

of_list_rev_mapi l ~f is the same as of_list (List.rev_mapi l ~f).

val map_inplace : 'a t -> f:('a -> 'a) -> unit

Modifies an array in place, applying f to every element of the array

val find_exn : 'a t -> f:('a -> bool) -> 'a

find_exn f t returns the first a in t for which f t.(i) is true. It raises Stdlib.Not_found or Not_found_s if there is no such a.

val find_map_exn : 'a t -> f:('a -> 'b option) -> 'b

Returns the first evaluation of f that returns Some. Raises Stdlib.Not_found or Not_found_s if f always returns None.

val findi_exn : 'a t -> f:(int -> 'a -> bool) -> int * 'a

findi_exn t f returns the first index i of t for which f i t.(i) is true. It raises Stdlib.Not_found or Not_found_s if there is no such element.

val find_mapi_exn : 'a t -> f:(int -> 'a -> 'b option) -> 'b

find_mapi_exn is like find_map_exn but passes the index as an argument.

val find_consecutive_duplicate : 
  'a t ->
  equal:('a -> 'a -> bool) ->
  ('a * 'a) option

find_consecutive_duplicate t ~equal returns the first pair of consecutive elements (a1, a2) in t such that equal a1 a2. They are returned in the same order as they appear in t.

val reduce : 'a t -> f:('a -> 'a -> 'a) -> 'a option

reduce f [a1; ...; an] is Some (f (... (f (f a1 a2) a3) ...) an). Returns None on the empty array.

val reduce_exn : 'a t -> f:('a -> 'a -> 'a) -> 'a

val permute : 
  ?random_state:Random.State.t ->
  ?pos:int ->
  ?len:int ->
  'a t ->
  unit

permute ?random_state ?pos ?len t randomly permutes t in place.

To permute only part of the array, specify pos to be the index to start permuting from and len indicating how many elements to permute.

permute side-effects random_state by repeated calls to Random.State.int. If random_state is not supplied, permute uses Random.State.default.

val random_element : ?random_state:Random.State.t -> 'a t -> 'a option

random_element ?random_state t is None if t is empty, else it is Some x for some x chosen uniformly at random from t.

random_element side-effects random_state by calling Random.State.int. If random_state is not supplied, random_element uses Random.State.default.

val random_element_exn : ?random_state:Random.State.t -> 'a t -> 'a

val zip : 'a t -> 'b t -> ('a * 'b) t option

zip is like List.zip, but for arrays.

val zip_exn : 'a t -> 'b t -> ('a * 'b) t

val unzip : ('a * 'b) t -> 'a t * 'b t

unzip is like List.unzip, but for arrays.

val sorted_copy : 'a t -> compare:('a -> 'a -> int) -> 'a t

sorted_copy ar compare returns a shallow copy of ar that is sorted. Similar to List.sort

val last : 'a t -> 'a

val equal : ('a -> 'a -> bool) -> 'a t -> 'a t -> bool

val to_sequence : 'a t -> 'a Sequence.t

The input array is copied internally so that future modifications of it do not change the sequence.

val to_sequence_mutable : 'a t -> 'a Sequence.t

The input array is shared with the sequence and modifications of it will result in modification of the sequence.