Data.Vinyl.TypeLevel

Documentation

data Nat

A mere approximation of the natural numbers. And their image as lifted by -XDataKinds corresponds to the actual natural numbers.

Constructors

Z

S !Nat

Instances

RSubset k ([] k) ss ([] Nat)

Methods

rsubset :: Functor g => (Rec [k] f ss -> g (Rec [k] f ss)) -> Rec [k] f [Nat] -> g (Rec [k] f [Nat])

rcast :: Rec [k] f [Nat] -> Rec [k] f ss

rreplace :: Rec [k] f ss -> Rec [k] f [Nat] -> Rec [k] f [Nat]

(RElem k r ss i, RSubset k rs ss is) => RSubset k ((:) k r rs) ss ((:) Nat i is)

Methods

rsubset :: Functor g => (Rec ((k ': r) rs) f ss -> g (Rec ((k ': r) rs) f ss)) -> Rec ((k ': r) rs) f ((Nat ': i) is) -> g (Rec ((k ': r) rs) f ((Nat ': i) is))

rcast :: Rec ((k ': r) rs) f ((Nat ': i) is) -> Rec ((k ': r) rs) f ss

rreplace :: Rec ((k ': r) rs) f ss -> Rec ((k ': r) rs) f ((Nat ': i) is) -> Rec ((k ': r) rs) f ((Nat ': i) is)

type family RIndex (r :: k) (rs :: [k]) :: Nat where ...

A partial relation that gives the index of a value in a list.

Equations

RIndex r (r ': rs) = Z

RIndex r (s ': rs) = S (RIndex r rs)

type family RImage (rs :: [k]) (ss :: [k]) :: [Nat] where ...

A partial relation that gives the indices of a sublist in a larger list.

Equations

RImage '[] ss = '[]

RImage (r ': rs) ss = RIndex r ss ': RImage rs ss

type family RecAll (f :: u -> *) (rs :: [u]) (c :: * -> Constraint) :: Constraint where ...

A constraint-former which applies to every field in a record.

Equations

RecAll f '[] c = ()

RecAll f (r ': rs) c = (c (f r), RecAll f rs c)

type family (as :: [k]) ++ (bs :: [k]) :: [k] where ...

Append for type-level lists.

Equations

'[] ++ bs = bs

(a ': as) ++ bs = a ': (as ++ bs)