Module Stdlib.ArrayLabels

Contents

Instructions: Use this module in your project

In the IDE (CLion, Visual Studio Code, Xcode, etc.) you use for your DkSDK project:

  1. Add the following to your project's dependencies/CMakeLists.txt:

    Copy
    DkSDKProject_DeclareAvailable(ocaml
    CONSTRAINT "= 4.14.0"
    FINDLIBS str unix runtime_events threads dynlink)
DkSDKProject_MakeAvailable(ocaml)

  2. Add the Findlib::ocaml library to any desired targets in src/*/CMakeLists.txt:

    Copy
    target_link_libraries(YourPackage_YourLibraryName
     # ... existing libraries, if any ...
     Findlib::ocaml)

  3. Click your IDE's Build button

Not using DkSDK?

FIRST, do one or all of the following:

  1. Run:

    Copy
    opam install ocaml.4.14.0

  2. Edit your dune-project and add:

    Copy
    (package
  (name YourExistingPackage)
  (depends
  ; ... existing dependenices ...
  (ocaml (>= 4.14.0))))

    Then run:

    Copy
    dune build *.opam # if this fails, run: dune build

  3. Edit your <package>.opam file and add:

    Copy
    depends: [
  # ... existing dependencies ...
  "ocaml" {>= "4.14.0"}
]

    Then run:

    Copy
    opam install . --deps-only

FINALLY, add the library to any desired (library)and/or (executable) targets in your **/dune files:

Copy
(library
  (name YourLibrary)
  ; ... existing library options ...
  (libraries
    ; ... existing libraries ...
    ))

(executable
  (name YourExecutable)
  ; ... existing executable options ...
  (libraries
    ; ... existing libraries ...
    ))
type``'a t`` ='a array

An alias for the type of arrays.

vallength :'aarray``-> int

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

valget :'aarray``->``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).

valset :'aarray``->``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.

valmake : ``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.

valcreate : ``int-> 'a -> 'a array

  • deprecated

    create is an alias for make.

valcreate_float : ``int-> ``float array

create_float n returns a fresh float array of length n, with uninitialized data.

  • since 4.03
valmake_float : ``int-> ``float array
valinit : ``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.

valmake_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.

valcreate_matrix : ``dimx:int->``dimy:int-> 'a -> 'a array`` array

  • deprecated

    create_matrix is an alias for make_matrix.

valappend :'aarray``-> 'aarray``-> 'a array

append v1 v2 returns a fresh array containing the concatenation of the arrays v1 and v2.

  • raises Invalid_argument

    if length v1 + length v2 > Sys.max_array_length.

valconcat :'aarray`` list``-> 'a array

Same as append, but concatenates a list of arrays.

valsub :'aarray``->``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.

valcopy :'aarray``-> 'a array

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

valfill :'aarray``->``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:'aarray``->``src_pos:int-> ``dst:'aarray``->``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.

valto_list :'aarray``-> 'a list

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

valof_list :'alist``-> 'a array

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

  • raises Invalid_argument

    if the length of l is greater than Sys.max_array_length.

Iterators

val iter : ``f:``('a ->unit)``-> 'aarray``-> 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); ().

valiteri : ``f:``(``int-> 'a ->unit)``-> 'aarray``-> 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 map : ``f:``('a -> 'b)`` -> 'aarray``-> '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) |].

valmapi : ``f:``(``int-> 'a -> 'b)`` -> 'aarray``-> '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 -> 'barray``-> '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_left_map : ``f:``('a -> 'b -> 'a*'c)`` -> ``init:'a -> 'barray``-> 'a*'c array

fold_left_map is a combination of fold_left and map that threads an accumulator through calls to f.

  • since 4.13.0
val fold_right : ``f:``('b -> 'a -> 'a)`` -> 'barray``-> ``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)``-> 'aarray``-> 'barray``-> 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)`` -> 'aarray``-> 'barray``-> '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 for_all : ``f:``('a ->bool)``-> 'aarray``-> 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 exists : ``f:``('a ->bool)``-> 'aarray``-> 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_all2 : ``f:``('a -> 'b ->bool)``-> 'aarray``-> 'barray``-> bool

Same as for_all, but for a two-argument predicate.

  • raises Invalid_argument

    if the two arrays have different lengths.

  • since 4.11.0

val exists2 : ``f:``('a -> 'b ->bool)``-> 'aarray``-> 'barray``-> bool

Same as exists, but for a two-argument predicate.

  • raises Invalid_argument

    if the two arrays have different lengths.

  • since 4.11.0

valmem :'a -> ``set:'aarray``-> bool

mem a ~set is true if and only if a is structurally equal to an element of l (i.e. there is an x in l such that compare a x = 0).

  • since 4.03.0
valmemq :'a -> ``set:'aarray``-> bool

Same as mem, but uses physical equality instead of structural equality to compare list elements.

  • since 4.03.0
val find_opt : ``f:``('a ->bool)``-> 'aarray``-> 'a option

find_opt ~f a returns the first element of the array a that satisfies the predicate f, or None if there is no value that satisfies f in the array a.

  • since 4.13.0
val find_map : ``f:``('a -> 'boption``)``-> 'aarray``-> 'b option

find_map ~f a applies f to the elements of a in order, and returns the first result of the form Some v, or None if none exist.

  • since 4.13.0

Arrays of pairs

val split : ``('a*'b)`` array`` -> 'aarray`` *'b array

split [|(a1,b1); ...; (an,bn)|] is ([|a1; ...; an|], [|b1; ...; bn|]).

  • since 4.13.0
valcombine :'aarray``-> 'barray``-> ``('a*'b)`` array

combine [|a1; ...; an|] [|b1; ...; bn|] is [|(a1,b1); ...; (an,bn)|]. Raise Invalid_argument if the two arrays have different lengths.

  • since 4.13.0

Sorting

val sort : ``cmp:``('a -> 'a ->int)``-> 'aarray``-> 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, Stdlib.compare is a suitable comparison function. After calling sort, the array is sorted in place in increasing order. 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 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 : ``cmp:``('a -> 'a ->int)``-> 'aarray``-> unit

Same as 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 a temporary array of length n/2, where n is the length of the array. It is usually faster than the current implementation of sort.

val fast_sort : ``cmp:``('a -> 'a ->int)``-> 'aarray``-> unit

Same as sort or stable_sort, whichever is faster on typical input.

Arrays and Sequences

valto_seq :'aarray``-> 'a Seq.t

Iterate on the array, in increasing order. Modifications of the array during iteration will be reflected in the sequence.

  • since 4.07
valto_seqi :'aarray``->``(int *'a)`` Seq.t

Iterate on the array, in increasing order, yielding indices along elements. Modifications of the array during iteration will be reflected in the sequence.

  • since 4.07
valof_seq :'a Seq.t -> 'a array

Create an array from the generator

  • since 4.07

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    1. DkSDK
      1. Package capnp
        1. Module Capnp
            1. Module type MessageSig.MESSAGE
            1. Module type MessageSig.S
              1. Module S.ListStorage
              1. Module S.Message
              1. Module S.Object
              1. Module S.Segment
              1. Module S.Slice
              1. Module S.StructStorage
            1. Module type MessageSig.SEGMENT
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        1. Module Capnp_unix
      1. Package cmdliner
        1. Module Cmdliner
        1. Module Cmdliner_arg
        1. Module Cmdliner_base
        1. Module Cmdliner_cline
        1. Module Cmdliner_cmd
        1. Module Cmdliner_docgen
        1. Module Cmdliner_eval
        1. Module Cmdliner_info
        1. Module Cmdliner_manpage
        1. Module Cmdliner_msg
        1. Module Cmdliner_term
        1. Module Cmdliner_term_deprecated
        1. Module Cmdliner_trie
      1. Package fmt
        1. Module Fmt
        1. Module Fmt_cli
        1. Module Fmt_tty
      1. Package logs
        1. Module Logs
          1. Module type Logs.LOG
          1. ...
        1. Module Logs_cli
        1. Module Logs_fmt
        1. Module Logs_lwt
          1. Module type Logs_lwt.LOG
        1. Module Logs_threaded
      1. Package lwt
        1. Module Lwt
        1. Module Lwt_bytes
        1. Module Lwt_condition
        1. Module Lwt_config
        1. Module Lwt_engine
        1. Module Lwt_features
        1. Module Lwt_fmt
        1. Module Lwt_gc
        1. Module Lwt_io
            1. Module type Lwt_io.NumberIO
        1. Module Lwt_list
        1. Module Lwt_main
            1. Module type Lwt_main.Hooks
        1. Module Lwt_mutex
        1. Module Lwt_mvar
        1. Module Lwt_pool
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            1. Module type Lwt_pqueue.OrderedType
            1. Module type Lwt_pqueue.S
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        1. Module Lwt_switch
        1. Module Lwt_sys
        1. Module Lwt_throttle
            1. Module type Lwt_throttle.S
        1. Module Lwt_timeout
        1. Module Lwt_unix
      1. Package mtime
        1. Module Mtime
        1. Module Mtime_clock
      1. Package ocaml
        1. Module Bigarray
        1. Module Condition
        1. Module Dynlink
        1. Module Event
        1. Module Mutex
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