Generic.Data.Internal.Functions

Type level functions on generic representations.

Documentation

type family NConstructors (r :: k -> Type) :: Nat

Number of constructors of a data type.

Instances

type NConstructors (f :+: g :: k -> *)

Defined in Generic.Data.Internal.Functions

type NConstructors (f :+: g :: k -> *) = NConstructors f + NConstructors g

type NConstructors (M1 C c f :: k -> *)

Defined in Generic.Data.Internal.Functions

type NConstructors (M1 C c f :: k -> *) = 1

type NConstructors (M1 D c f :: k -> *)

Defined in Generic.Data.Internal.Functions

type NConstructors (M1 D c f :: k -> *) = NConstructors f

nconstructors :: forall r. KnownNat (NConstructors r) => Integer

type family NFields (r :: k -> Type) :: Nat

Arity of a constructor.

Instances

type NFields (f :*: g :: k -> *)

Defined in Generic.Data.Internal.Functions

type NFields (f :*: g :: k -> *) = NFields f + NFields g

type NFields (M1 S c f :: k -> *)

Defined in Generic.Data.Internal.Functions

type NFields (M1 S c f :: k -> *) = 1

type NFields (M1 C c f :: k -> *)

Defined in Generic.Data.Internal.Functions

type NFields (M1 C c f :: k -> *) = NFields f

nfields :: forall r. KnownNat (NFields r) => Integer