darcs-2.18.5: a distributed, interactive, smart revision control system
Safe HaskellNone
LanguageHaskell2010

Darcs.Patch.Witnesses.Sealed

Synopsis

Documentation

data Sealed (a :: Type -> Type) where #

A Sealed type is a way of hide an existentially quantified type parameter, in this case wX, inside the type. Note that the only thing we can currently recover about the existentially quantified type wX is that it exists.

Constructors

Sealed :: forall (a :: Type -> Type) wX. a wX -> Sealed a 

Instances

Instances details
Show1 a => Show (Sealed a) # 
Instance details

Defined in Darcs.Patch.Witnesses.Sealed

Methods

showsPrec :: Int -> Sealed a -> ShowS #

show :: Sealed a -> String #

showList :: [Sealed a] -> ShowS #

Eq2 a => Eq (Sealed (a wX)) # 
Instance details

Defined in Darcs.Patch.Witnesses.Sealed

Methods

(==) :: Sealed (a wX) -> Sealed (a wX) -> Bool #

(/=) :: Sealed (a wX) -> Sealed (a wX) -> Bool #

seal :: a wX -> Sealed a #

unseal :: (forall wX. a wX -> b) -> Sealed a -> b #

mapSeal :: (forall wX. a wX -> b wX) -> Sealed a -> Sealed b #

data Sealed2 (a :: Type -> Type -> Type) where #

The same as Sealed but for two parameters (wX and wY).

Constructors

Sealed2 :: forall (a :: Type -> Type -> Type) wX wY. !(a wX wY) -> Sealed2 a 

Instances

Instances details
Show2 a => Show (Sealed2 a) # 
Instance details

Defined in Darcs.Patch.Witnesses.Sealed

Methods

showsPrec :: Int -> Sealed2 a -> ShowS #

show :: Sealed2 a -> String #

showList :: [Sealed2 a] -> ShowS #

seal2 :: a wX wY -> Sealed2 a #

unseal2 :: (forall wX wY. a wX wY -> b) -> Sealed2 a -> b #

mapSeal2 :: (forall wX wY. a wX wY -> b wX wY) -> Sealed2 a -> Sealed2 b #

data FlippedSeal (a :: Type -> Type -> Type) wY where #

Constructors

FlippedSeal :: forall (a :: Type -> Type -> Type) wX wY. !(a wX wY) -> FlippedSeal a wY 

flipSeal :: a wX wY -> FlippedSeal a wY #

unsealFlipped :: (forall wX wY. a wX wY -> b) -> FlippedSeal a wZ -> b #

mapFlipped :: (forall wX. a wX wY -> b wX wZ) -> FlippedSeal a wY -> FlippedSeal b wZ #

data Dup (p :: Type -> Type) wX wY where #

Duplicate a single witness. This is for situations where a patch-like type is expected, i.e. a type with two witnesses, but we have only a type with one witness. Naturally, any concrete value must have both witnesses agreeing.

Note that Sealed (Dup p wX) is isomorphic to p wX.

Constructors

Dup :: forall (p :: Type -> Type) wX. p wX -> Dup p wX wX 

class Gap (w :: (Type -> Type -> Type) -> Type) where #

Gap abstracts over FreeLeft and FreeRight for code constructing these values

Methods

emptyGap :: (forall wX. p wX wX) -> w p #

An empty Gap, e.g. NilFL or NilRL

freeGap :: (forall wX wY. p wX wY) -> w p #

A Gap constructed from a completely polymorphic value, for example the constructors for primitive patches

joinGap :: (forall wX wY wZ. p wX wY -> q wY wZ -> r wX wZ) -> w p -> w q -> w r #

Compose two Gap values together in series, e.g. 'joinGap (+>+)' or 'joinGap (:>:)'

Instances

Instances details
Gap FreeLeft # 
Instance details

Defined in Darcs.Patch.Witnesses.Sealed

Methods

emptyGap :: (forall wX. p wX wX) -> FreeLeft p #

freeGap :: (forall wX wY. p wX wY) -> FreeLeft p #

joinGap :: (forall wX wY wZ. p wX wY -> q wY wZ -> r wX wZ) -> FreeLeft p -> FreeLeft q -> FreeLeft r #

Gap FreeRight # 
Instance details

Defined in Darcs.Patch.Witnesses.Sealed

Methods

emptyGap :: (forall wX. p wX wX) -> FreeRight p #

freeGap :: (forall wX wY. p wX wY) -> FreeRight p #

joinGap :: (forall wX wY wZ. p wX wY -> q wY wZ -> r wX wZ) -> FreeRight p -> FreeRight q -> FreeRight r #

data FreeLeft (p :: Type -> Type -> Type) #

FreeLeft p is forall x . exists y . p x y In other words the caller is free to specify the left witness, and then the right witness is an existential. Note that the order of the type constructors is important for ensuring that y is dependent on the x that is supplied. This is why Stepped is needed, rather than writing the more obvious Sealed (Poly p) which would notionally have the same quantification of the type witnesses.

Instances

Instances details
Gap FreeLeft # 
Instance details

Defined in Darcs.Patch.Witnesses.Sealed

Methods

emptyGap :: (forall wX. p wX wX) -> FreeLeft p #

freeGap :: (forall wX wY. p wX wY) -> FreeLeft p #

joinGap :: (forall wX wY wZ. p wX wY -> q wY wZ -> r wX wZ) -> FreeLeft p -> FreeLeft q -> FreeLeft r #

unFreeLeft :: forall (p :: Type -> Type -> Type) wX. FreeLeft p -> Sealed (p wX) #

Unwrap a FreeLeft value

data FreeRight (p :: Type -> Type -> Type) #

FreeRight p is forall y . exists x . p x y In other words the caller is free to specify the right witness, and then the left witness is an existential. Note that the order of the type constructors is important for ensuring that x is dependent on the y that is supplied.

Instances

Instances details
Gap FreeRight # 
Instance details

Defined in Darcs.Patch.Witnesses.Sealed

Methods

emptyGap :: (forall wX. p wX wX) -> FreeRight p #

freeGap :: (forall wX wY. p wX wY) -> FreeRight p #

joinGap :: (forall wX wY wZ. p wX wY -> q wY wZ -> r wX wZ) -> FreeRight p -> FreeRight q -> FreeRight r #

unFreeRight :: forall (p :: Type -> Type -> Type) wX. FreeRight p -> FlippedSeal p wX #

Unwrap a FreeRight value