package hack_parallel

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Parallel and shared memory library

Install

Dune Dependency

Authors

Maintainers

Sources

1.0.1.tar.gz
md5=ba7c72bc207e326b72e294fc76f6ad2c
sha512=5020d47f97bea2f88e2a40411894d03232a7f2282606926c93c7d4c96d72e94a966be852897a9b16f7e0893ba376512045abb9d93020a7c03c3def4f3d918f8e

doc/src/hack_parallel.hack_core/hack_option.ml.html

Source file hack_option.ml

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type 'a t = 'a option

let is_none = function None -> true | _ -> false

let is_some = function Some _ -> true | _ -> false

let value_map o ~default ~f =
  match o with
  | Some x -> f x
  | None   -> default

let iter o ~f =
  match o with
  | None -> ()
  | Some a -> f a

let map2 o1 o2 ~f =
  match o1, o2 with
  | Some a1, Some a2 -> Some (f a1 a2)
  | _ -> None

let call x ~f =
  match f with
  | None -> ()
  | Some f -> f x

let value t ~default =
  match t with
  | None -> default
  | Some x -> x
;;

let to_array t =
  match t with
  | None -> [||]
  | Some x -> [|x|]
;;

let to_list t =
  match t with
  | None -> []
  | Some x -> [x]
;;

let min_elt t ~cmp:_ = t
let max_elt t ~cmp:_ = t

let sum (type a) (module M : Hack_commutative_group.S with type t = a) t ~f =
  match t with
  | None -> M.zero
  | Some x -> f x
;;

let for_all t ~f =
  match t with
  | None -> true
  | Some x -> f x
;;

let exists t ~f =
  match t with
  | None -> false
  | Some x -> f x
;;

let mem ?(equal = (=)) t a =
  match t with
  | None -> false
  | Some a' -> equal a a'
;;

let length t =
  match t with
  | None -> 0
  | Some _ -> 1
;;

let is_empty = is_none

let fold t ~init ~f =
  match t with
  | None -> init
  | Some x -> f init x
;;

let count t ~f =
  match t with
  | None -> 0
  | Some a -> if f a then 1 else 0
;;

let find t ~f =
  match t with
  | None -> None
  | Some x -> if f x then Some x else None
;;

let find_map t ~f =
  match t with
  | None -> None
  | Some a -> f a
;;

let equal f t t' =
  match t, t' with
  | None, None -> true
  | Some x, Some x' -> f x x'
  | _ -> false

let some x = Some x

let both x y =
  match x,y with
  | Some a, Some b -> Some (a,b)
  | _ -> None

let first_some x y =
  match x with
  | Some _ -> x
  | None -> y

let some_if cond x = if cond then Some x else None

let merge a b ~f =
  match a, b with
  | None, x | x, None -> x
  | Some a, Some b -> Some (f a b)

let filter t ~f =
  match t with
  | Some v as o when f v -> o
  | _ -> None

let try_with f =
  try Some (f ())
  with _ -> None

include Hack_monad.Make (struct
    type 'a t = 'a option
    let return x = Some x
    let map t ~f =
      match t with
      | None -> None
      | Some a -> Some (f a)
    ;;
    let map = `Custom map
    let bind o f =
      match o with
      | None -> None
      | Some x -> f x
  end)
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