Safe Haskell	None
Language	Haskell2010

Data.Override

Synopsis

Documentation

type family Using (ms :: Maybe Symbol) (x :: *) (xs :: [*]) where ... Source #

Type family used to determine which override from xs to replace x with, if any. The ms holds the field name for x, if applicable.

Equations

Using ms x '[] = x
Using ms x (As (o :: Symbol) n ': xs) = If (ms == Just o) n (Using ms x xs)
Using ms x (As (o :: *) n ': xs) = If (x == o) n (Using ms x xs)

newtype Overridden (ms :: Maybe Symbol) a (xs :: [*]) Source #

Used at the leaf nodes of a generic Rep

Constructors

data As (o :: k) n Source #

Used to construct a type-level override. Usually used infix. The o should be either a type (kind *) or a type-level string (kind Symbol).

newtype Override a (xs :: [*]) Source #

The feature of this library. For use with DerivingVia. Apply it to a type a and supply a type-level list of instance overrides xs.

Constructors

Instances

Eq a => Eq (Override a xs) Source #
Instance details Defined in Data.Override.Internal Methods (==) :: Override a xs -> Override a xs -> Bool # (/=) :: Override a xs -> Override a xs -> Bool #
Show a => Show (Override a xs) Source #
Instance details Defined in Data.Override.Internal Methods showsPrec :: Int -> Override a xs -> ShowS # show :: Override a xs -> String # showList :: [Override a xs] -> ShowS #
(Generic a, GOverride xs (Rep a)) => Generic (Override a xs) Source #
Instance details Defined in Data.Override.Internal Associated Types type Rep (Override a xs) :: Type -> Type # Methods from :: Override a xs -> Rep (Override a xs) x # to :: Rep (Override a xs) x -> Override a xs #
type Rep (Override a xs) Source #
Instance details Defined in Data.Override.Internal type Rep (Override a xs) = OverrideRep xs (Rep a)

Unwrap an Override value.

override :: a -> proxy xs -> Override a xs Source #

Construct an Override using a proxy of overrides.

Unwrap an Overridden value.