mirror of
https://github.com/c-cube/ocaml-containers.git
synced 2025-12-06 11:15:31 -05:00
78 lines
2.3 KiB
OCaml
78 lines
2.3 KiB
OCaml
|
|
(*
|
|
copyright (c) 2013-2014, simon cruanes
|
|
all rights reserved.
|
|
|
|
redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
redistributions of source code must retain the above copyright notice, this
|
|
list of conditions and the following disclaimer. redistributions in binary
|
|
form must reproduce the above copyright notice, this list of conditions and the
|
|
following disclaimer in the documentation and/or other materials provided with
|
|
the distribution.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
|
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*)
|
|
|
|
type t = int
|
|
|
|
let equal (a:int) b = a=b
|
|
|
|
let compare (a:int) b = Pervasives.compare a b
|
|
|
|
let hash i = i land max_int
|
|
|
|
let sign i =
|
|
if i < 0 then -1
|
|
else if i>0 then 1
|
|
else 0
|
|
|
|
let neg i = -i
|
|
|
|
let pow a b =
|
|
let rec aux acc = function
|
|
| 1 -> acc
|
|
| n ->
|
|
if n mod 2 = 0
|
|
then aux (acc*acc) (n/2)
|
|
else acc * (aux (acc*acc) (n/2))
|
|
in
|
|
match b with
|
|
| 0 -> if a = 0 then raise (Invalid_argument "Undefined value 0^0") else 1
|
|
| b when b < 0 -> raise (Invalid_argument "pow: can't raise int to negative power")
|
|
| b -> aux a b
|
|
|
|
(*$T
|
|
pow 2 10 = 1024
|
|
pow 2 15 = 32768
|
|
pow 10 5 = 100000
|
|
pow 1 0 = 1
|
|
pow 0 1 = 0
|
|
*)
|
|
|
|
type 'a printer = Buffer.t -> 'a -> unit
|
|
type 'a formatter = Format.formatter -> 'a -> unit
|
|
type 'a random_gen = Random.State.t -> 'a
|
|
|
|
let random n st = Random.State.int st n
|
|
let random_small = random 100
|
|
let random_range i j st = i + random (j-i) st
|
|
|
|
let pp buf = Printf.bprintf buf "%d"
|
|
let print fmt = Format.pp_print_int fmt
|
|
|
|
let to_string = string_of_int
|
|
|
|
let of_string s =
|
|
try Some (int_of_string s)
|
|
with _ -> None
|