package containers

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  1. Array Slice
    1. IO
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Array Slice

type 'a sequence = ('a -> unit) -> unit
type 'a klist = unit -> [ `Nil | `Cons of 'a * 'a klist ]
type 'a gen = unit -> 'a option
type 'a equal = 'a -> 'a -> bool
type 'a ord = 'a -> 'a -> int
type 'a random_gen = Random.State.t -> 'a
type 'a printer = Format.formatter -> 'a -> unit
type 'a t

Array slice, containing elements of type 'a

val empty : 'a t
val equal : 'a equal -> 'a t equal
val compare : 'a ord -> 'a t ord
val get : 'a t -> int -> 'a
val get_safe : 'a t -> int -> 'a option

get_safe a i returns Some a.(i) if i is a valid index

  • since 0.18
val make : 'a array -> int -> len:int -> 'a t

Create a slice from given offset and length..

  • raises Invalid_argument

    if the slice isn't valid

val of_slice : ('a array * int * int) -> 'a t

Make a sub-array from a triple (arr, i, len) where arr is the array, i the offset in arr, and len the number of elements of the slice.

  • raises Invalid_argument

    if the slice isn't valid (See make)

val to_slice : 'a t -> 'a array * int * int

Convert into a triple (arr, i, len) where len is the length of the subarray of arr starting at offset i

val to_list : 'a t -> 'a list

Convert directly to a list

  • since 1.0
val full : 'a array -> 'a t

Slice that covers the full array

val underlying : 'a t -> 'a array

Underlying array (shared). Modifying this array will modify the slice

val copy : 'a t -> 'a array

Copy into a new array

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

Sub-slice

val set : 'a t -> int -> 'a -> unit
val length : _ t -> int
val fold : ('a -> 'b -> 'a) -> 'a -> 'b t -> 'a
val foldi : ('a -> int -> 'b -> 'a) -> 'a -> 'b t -> 'a

Fold left on array, with index

val fold_while : ('a -> 'b -> 'a * [ `Stop | `Continue ]) -> 'a -> 'b t -> 'a

Fold left on array until a stop condition via ('a, `Stop) is indicated by the accumulator

  • since 0.8
val iter : ('a -> unit) -> 'a t -> unit
val iteri : (int -> 'a -> unit) -> 'a t -> unit
val blit : 'a t -> int -> 'a t -> int -> int -> unit

blit from i into j len copies len elements from the first array to the second. See Array.blit.

val reverse_in_place : 'a t -> unit

Reverse the array in place

val sorted : ('a -> 'a -> int) -> 'a t -> 'a array

sorted cmp a makes a copy of a and sorts it with cmp.

  • since 1.0
val sort_indices : ('a -> 'a -> int) -> 'a t -> int array

sort_indices cmp a returns a new array b, with the same length as a, such that b.(i) is the index at which the i-th element of sorted cmp a appears in a. a is not modified.

In other words, map (fun i -> a.(i)) (sort_indices cmp a) = sorted cmp a. sort_indices yields the inverse permutation of sort_ranking.

  • since 1.0
val sort_ranking : ('a -> 'a -> int) -> 'a t -> int array

sort_ranking cmp a returns a new array b, with the same length as a, such that b.(i) is the index at which the i-the element of a appears in sorted cmp a. a is not modified.

In other words, map (fun i -> (sorted cmp a).(i)) (sort_ranking cmp a) = a. sort_ranking yields the inverse permutation of sort_indices.

In the absence of duplicate elements in a, we also have lookup_exn a.(i) (sorted a) = (sorted_ranking a).(i)

  • since 1.0
val find : ('a -> 'b option) -> 'a t -> 'b option

find f a returns Some y if there is an element x such that f x = Some y, else it returns None

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

Like find, but also pass the index to the predicate function.

  • since 0.3.4
val find_idx : ('a -> bool) -> 'a t -> (int * 'a) option

find_idx p x returns Some (i,x) where x is the i-th element of l, and p x holds. Otherwise returns None

  • since 0.3.4
val lookup : ?cmp:'a ord -> 'a -> 'a t -> int option

Lookup the index of some value in a sorted array.

  • returns

    None if the key is not present, or Some i (i the index of the key) otherwise

val lookup_exn : ?cmp:'a ord -> 'a -> 'a t -> int

Same as lookup, but

  • raises Not_found

    if the key is not present

val bsearch : ?cmp:('a -> 'a -> int) -> 'a -> 'a t -> [ `All_lower | `All_bigger | `Just_after of int | `Empty | `At of int ]

bsearch ?cmp x arr finds the index of the object x in the array arr, provided arr is sorted using cmp. If the array is not sorted, the result is not specified (may raise Invalid_argument).

Complexity: O(log n) where n is the length of the array (dichotomic search).

  • returns
    • `At i if cmp arr.(i) x = 0 (for some i)
    • `All_lower if all elements of arr are lower than x
    • `All_bigger if all elements of arr are bigger than x
    • `Just_after i if arr.(i) < x < arr.(i+1)
    • `Empty if the array is empty
  • raises Invalid_argument

    if the array is found to be unsorted w.r.t cmp

  • since 0.13
val for_all : ('a -> bool) -> 'a t -> bool
val for_all2 : ('a -> 'b -> bool) -> 'a t -> 'b t -> bool

Forall on pairs of arrays.

  • raises Invalid_argument

    if they have distinct lengths allow different types

    @since 0.20

val exists : ('a -> bool) -> 'a t -> bool
val exists2 : ('a -> 'b -> bool) -> 'a t -> 'b t -> bool

Exists on pairs of arrays.

  • raises Invalid_argument

    if they have distinct lengths allow different types

    @since 0.20

val fold2 : ('acc -> 'a -> 'b -> 'acc) -> 'acc -> 'a t -> 'b t -> 'acc

Fold on two arrays stepwise.

  • raises Invalid_argument

    if they have distinct lengths

  • since 0.20
val iter2 : ('a -> 'b -> unit) -> 'a t -> 'b t -> unit

Iterate on two arrays stepwise.

  • raises Invalid_argument

    if they have distinct lengths

  • since 0.20
val shuffle : 'a t -> unit

Shuffle randomly the array, in place

val shuffle_with : Random.State.t -> 'a t -> unit

Like shuffle but using a specialized random state

val random_choose : 'a t -> 'a random_gen

Choose an element randomly.

  • raises Not_found

    if the array/slice is empty

val to_seq : 'a t -> 'a sequence
val to_gen : 'a t -> 'a gen
val to_klist : 'a t -> 'a klist

IO

val pp : ?sep:string -> 'a printer -> 'a t printer

Print an array of items with printing function

val pp_i : ?sep:string -> (int -> 'a printer) -> 'a t printer

Print an array, giving the printing function both index and item

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