(use Bool)
(use Int)
(use Long)
(use Test)

(def i 1)
(def l 1l)

(defn return-res-int [f a b]
  (let [c 0
        _ false]
    (do
      (set! &_ (f a b &c))
      c)))

(defn return-res-long [f a b]
  (let [c 0l
        _ false]
    (do
      (set! &_ (f a b &c))
      c)))

(defn main []
  (with-test test
    (assert-equal test
                  false
                  (safe-add 1 2 &i)
                  "safe-add is false without overflow"
                  =
                  str)
    (assert-equal test
                  3
                  (return-res-int safe-add 1 2)
                  "safe-add really adds"
                  =
                  str)
    (assert-equal test
                  true
                  (safe-add 1000000000 2000000000 &i)
                  "safe-add is true with overflow"
                  =
                  str)
    (assert-equal test
                  false
                  (safe-sub 1 2 &i)
                  "safe-sub is false without overflow"
                  =
                  str)
    (assert-equal test
                  -1
                  (return-res-int safe-sub 1 2)
                  "safe-sub really subs"
                  =
                  str)
    (assert-equal test
                  true
                  (safe-sub -1000000000 2000000000 &i)
                  "safe-sub is true with overflow"
                  =
                  str)
    (assert-equal test
                  false
                  (safe-mul 1 2 &i)
                  "safe-mul is false without overflow"
                  =
                  str)
    (assert-equal test
                  4
                  (return-res-int safe-mul 2 2)
                  "safe-mul really muls"
                  =
                  str)
    (assert-equal test
                  true
                  (safe-mul 1000000000 2000000000 &i)
                  "safe-mul is true with overflow"
                  =
                  str)
    (assert-equal test
                  false
                  (safe-add 1l 2l &l)
                  "safe-add is false without overflow"
                  =
                  str)
    (assert-equal test
                  3l
                  (return-res-long safe-add 1l 2l)
                  "safe-add really adds"
                  =
                  str)
    (assert-equal test
                  true
                  (safe-add 9000000000000000000l 2000000000000000000l &l)
                  "safe-add is true with overflow"
                  =
                  str)
    (assert-equal test
                  false
                  (safe-sub 1l 2l &l)
                  "safe-sub is false without overflow"
                  =
                  str)
    (assert-equal test
                  -1l
                  (return-res-long safe-sub 1l 2l)
                  "safe-sub really subs"
                  =
                  str)
    (assert-equal test
                  true
                  (safe-sub 9000000000000000000l -2000000000000000000l &l)
                  "safe-sub is true with overflow"
                  =
                  str)
    (assert-equal test
                  false
                  (safe-mul 1l 2l &l)
                  "safe-mul is false without overflow"
                  =
                  str)
    (assert-equal test
                  4l
                  (return-res-long safe-mul 2l 2l)
                  "safe-mul really muls"
                  =
                  str)
    (assert-equal test
                  true
                  (safe-mul 9000000000000000000l 2000000000000000000l &l)
                  "safe-mul is true with overflow"
                  =
                  str)
    (print-test-results test)))