mirror of
https://github.com/idris-lang/Idris2.git
synced 2024-12-24 12:14:26 +03:00
65 lines
1.6 KiB
Idris
65 lines
1.6 KiB
Idris
data Usage = Once | Many
|
|
|
|
data Use : Usage -> (Type -> Type) -> Type -> Type where
|
|
Pure : (1 x : a) -> Use t m a
|
|
BindOnce : (1 act : Use Once m a) -> (1 k : (1 x : a) -> Use t m b) -> Use t m b
|
|
BindMany : (1 act : Use Many m a) -> (1 k : (x : a) -> Use t m b) -> Use t m b
|
|
|
|
contType : (Type -> Type) -> Usage -> Usage -> Type -> Type -> Type
|
|
contType m Once q a b = ((1 x : a) -> Use q m b)
|
|
contType m Many q a b = ((x : a) -> Use q m b)
|
|
|
|
(>>=) : {p : _} -> (1 f : Use p m a) -> (1 k : contType m p q a b) -> Use q m b
|
|
(>>=) {p = Once} = BindOnce
|
|
(>>=) {p = Many} = BindMany
|
|
|
|
pure : (1 x : a) -> Use t m a
|
|
pure = Pure
|
|
|
|
One : (Type -> Type) -> Type -> Type
|
|
One = Use Once
|
|
|
|
Any : (Type -> Type) -> Type -> Type
|
|
Any = Use Many
|
|
|
|
data DoorState = Closed | Open
|
|
|
|
data Door : DoorState -> Type where
|
|
MkDoor : (isOpen : Bool) -> Door (if isOpen then Open else Closed)
|
|
|
|
newDoor : One m (Door Closed)
|
|
newDoor = pure (MkDoor False)
|
|
|
|
knock : (1 d : Door Closed) -> One m (Door Closed)
|
|
openDoor : (1 d : Door Closed) ->
|
|
One m (Res Bool (\r => Door (if r then Open else Closed)))
|
|
|
|
closeDoor : (1 d : Door Open) -> One m (Door Closed)
|
|
|
|
deleteDoor : (1 d : Door Closed) -> Any m ()
|
|
|
|
doorProg : Any m ()
|
|
doorProg
|
|
= do d <- newDoor
|
|
r <- openDoor d
|
|
let x = 42
|
|
case r of
|
|
what => ?now
|
|
|
|
doorProg2 : Any m ()
|
|
doorProg2
|
|
= do d <- newDoor
|
|
r <- openDoor d
|
|
let x = 42
|
|
case r of
|
|
(res # d) => ?now_1
|
|
|
|
doorProg3 : Any m ()
|
|
doorProg3
|
|
= do d <- newDoor
|
|
r <- openDoor d
|
|
let x = 42
|
|
case r of
|
|
(True # d) => ?now_2
|
|
(False # d) => ?now_3
|