open CCInt64

module T = (val Containers_testlib.make ~__FILE__ ())
include T;;

t @@ fun () -> pow 2L 10L = 1024L;;
t @@ fun () -> pow 2L 15L = 32768L;;
t @@ fun () -> pow 10L 5L = 100000L;;
t @@ fun () -> pow 42L 0L = 1L;;
t @@ fun () -> pow 0L 1L = 0L;;
t @@ fun () -> (floor_div 3L 5L = 0L);;
t @@ fun () -> (floor_div 5L 5L = 1L);;
t @@ fun () -> (floor_div 20L 5L = 4L);;
t @@ fun () -> (floor_div 12L 5L = 2L);;
t @@ fun () -> (floor_div 0L 5L = 0L);;
t @@ fun () -> (floor_div (-1L) 5L = -1L);;
t @@ fun () -> (floor_div (-5L) 5L = -1L);;
t @@ fun () -> (floor_div (-12L) 5L = -3L);;
t @@ fun () -> (floor_div 0L (-5L) = 0L);;
t @@ fun () -> (floor_div 3L (-5L) = -1L);;
t @@ fun () -> (floor_div 5L (-5L) = -1L);;
t @@ fun () -> (floor_div 9L (-5L) = -2L);;
t @@ fun () -> (floor_div 20L (-5L) = -4L);;
t @@ fun () -> (floor_div (-2L) (-5L) = 0L);;
t @@ fun () -> (floor_div (-8L) (-5L) = 1L);;
t @@ fun () -> (floor_div (-35L) (-5L) = 7L);;
t @@ fun () -> try ignore (floor_div 12L 0L); false with Division_by_zero -> true;;
t @@ fun () -> try ignore (floor_div (-12L) 0L); false with Division_by_zero -> true;;

q (Q.pair (Q.map of_int Q.small_signed_int) (Q.map of_int Q.small_nat))
      (fun (n, m) -> let m = m + 1L in
      floor_div n m = of_float @@ floor (to_float n /. to_float m));;
q (Q.pair (Q.map of_int Q.small_signed_int) (Q.map of_int Q.small_nat))
      (fun (n, m) -> let m = m + 1L in
      floor_div n (-m) = of_float @@ floor (to_float n /. to_float (-m)));;


eq ~printer:Q.Print.(list to_string) [0L;1L;2L;3L;4L;5L] (range 0L 5L |> Iter.to_list);;
eq ~printer:Q.Print.(list to_string) [0L]                (range 0L 0L |> Iter.to_list);;
eq ~printer:Q.Print.(list to_string) [5L;4L;3L;2L]       (range 5L 2L |> Iter.to_list);;

(* note: the last test checks that no error occurs due to overflows. *)
let eq' = eq ~printer:Q.Print.(list to_string);;
eq'  [0L]       (range_by ~step:1L   0L 0L      |> Iter.to_list);;
eq'  []         (range_by ~step:1L   5L 0L      |> Iter.to_list);;
eq'  []         (range_by ~step:2L   1L 0L      |> Iter.to_list);;
eq'  [0L;2L;4L] (range_by ~step:2L   0L 4L      |> Iter.to_list);;
eq'  [0L;2L;4L] (range_by ~step:2L   0L 5L      |> Iter.to_list);;
eq'  [0L]       (range_by ~step:(neg 1L) 0L 0L  |> Iter.to_list);;
eq'  []         (range_by ~step:(neg 1L) 0L 5L  |> Iter.to_list);;
eq'  []         (range_by ~step:(neg 2L) 0L 1L  |> Iter.to_list);;
eq'  [5L;3L;1L] (range_by ~step:(neg 2L) 5L 1L  |> Iter.to_list);;
eq'  [5L;3L;1L] (range_by ~step:(neg 2L) 5L 0L  |> Iter.to_list);;
eq'  [0L]       (range_by ~step:max_int 0L 2L   |> Iter.to_list);;

q Q.(pair (map of_int small_int) (map of_int small_int)) (fun (i,j) ->
    let i = min i j and j = max i j in
    CCList.equal CCInt64.equal
      (CCInt64.range_by ~step:1L i j |> Iter.to_list)
      (CCInt64.range i j |> Iter.to_list) );;

eq ~printer:CCFun.id "0b111" (to_string_binary 7L);;
eq ~printer:CCFun.id "-0b111" (to_string_binary (-7L));;
eq ~printer:CCFun.id "0b0" (to_string_binary 0L);;