ea221f3283
This PR modifies the signature of the functions `Nat.fold`, `Nat.foldRev`, `Nat.any`, `Nat.all`, so that the function is passed the upper bound. This allows us to change runtime array bounds checks to compile time checks in many places.
24 lines
605 B
Text
24 lines
605 B
Text
--
|
|
def inc (r : IO.Ref Nat) : IO Unit := do
|
|
let v ← r.get;
|
|
r.set (v+1);
|
|
IO.println (">> " ++ toString v)
|
|
|
|
def initArray (r : IO.Ref (Array Nat)) (n : Nat) : IO Unit :=
|
|
n.forM $ fun i _ => do
|
|
r.modify $ fun a => a.push (2*i)
|
|
|
|
def showArrayRef (r : IO.Ref (Array Nat)) : IO Unit := do
|
|
let a ← r.swap ∅;
|
|
a.size.forM (fun i _ => IO.println ("[" ++ toString i ++ "]: " ++ toString (a.get! i)));
|
|
discard $ r.swap a;
|
|
pure ()
|
|
|
|
def tst (n : Nat) : IO Unit := do
|
|
let r₁ ← IO.mkRef 0;
|
|
n.forM fun _ _ => inc r₁;
|
|
let r₂ ← IO.mkRef (∅ : Array Nat);
|
|
initArray r₂ n;
|
|
showArrayRef r₂
|
|
|
|
#eval tst 10
|