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55 lines
1.2 KiB
OCaml
55 lines
1.2 KiB
OCaml
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(* This file is free software, part of containers. See file "license" for more details. *)
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type t = int
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let equal (a:int) b = a=b
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let compare (a:int) b = Pervasives.compare a b
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let hash i = i land max_int
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let sign i =
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if i < 0 then -1
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else if i>0 then 1
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else 0
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let neg i = -i
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let pow a b =
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let rec aux acc = function
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| 1 -> acc
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| n ->
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if n mod 2 = 0
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then aux (acc*acc) (n/2)
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else acc * (aux (acc*acc) (n/2))
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in
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match b with
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| 0 -> if a = 0 then raise (Invalid_argument "pow: undefined value 0^0") else 1
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| b when b < 0 -> raise (Invalid_argument "pow: can't raise int to negative power")
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| b -> aux a b
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(*$T
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pow 2 10 = 1024
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pow 2 15 = 32768
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pow 10 5 = 100000
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pow 1 0 = 1
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pow 0 1 = 0
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*)
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type 'a printer = Buffer.t -> 'a -> unit
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type 'a formatter = Format.formatter -> 'a -> unit
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type 'a random_gen = Random.State.t -> 'a
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let random n st = Random.State.int st n
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let random_small = random 100
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let random_range i j st = i + random (j-i) st
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let pp buf = Printf.bprintf buf "%d"
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let print fmt = Format.pp_print_int fmt
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let to_string = string_of_int
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let of_string s =
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try Some (int_of_string s)
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with _ -> None
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