Data.Vinyl.ARec

Constant-time field accessors for extensible records. The trade-off is the usual lists vs arrays one: it is fast to add an element to the head of a list, but element access is linear time; array access time is uniform, but extending the array is more slower.

Documentation

newtype ARec (f :: k -> *) (ts :: [k])

An array-backed extensible record with constant-time field access.

Constructors

ARec (Array Int Any)

Instances

(i ~ RIndex t ts, NatToInt (RIndex t ts)) => RecElem (ARec :: (k -> *) -> [k] -> *) (t :: k) (ts :: [k]) i

Defined in Data.Vinyl.ARec

Methods

rlens :: Functor g => sing t -> (f t -> g (f t)) -> ARec f ts -> g (ARec f ts)

rget :: sing t -> ARec f ts -> f t

rput :: f t -> ARec f ts -> ARec f ts

(is ~ RImage rs ss, IndexWitnesses is, NatToInt (RLength rs)) => RecSubset (ARec :: (k -> *) -> [k] -> *) (rs :: [k]) (ss :: [k]) is

Defined in Data.Vinyl.ARec

Methods

rsubset :: Functor g => (ARec f rs -> g (ARec f rs)) -> ARec f ss -> g (ARec f ss)

rcast :: ARec f ss -> ARec f rs

rreplace :: ARec f rs -> ARec f ss -> ARec f ss

(AllConstrained (IndexableField rs) rs, RecApplicative rs, Eq (Rec f rs)) => Eq (ARec f rs)

Defined in Data.Vinyl.ARec

Methods

(==) :: ARec f rs -> ARec f rs -> Bool

(/=) :: ARec f rs -> ARec f rs -> Bool

(AllConstrained (IndexableField rs) rs, RecApplicative rs, Ord (Rec f rs)) => Ord (ARec f rs)

Defined in Data.Vinyl.ARec

Methods

compare :: ARec f rs -> ARec f rs -> Ordering

(<) :: ARec f rs -> ARec f rs -> Bool

(<=) :: ARec f rs -> ARec f rs -> Bool

(>) :: ARec f rs -> ARec f rs -> Bool

(>=) :: ARec f rs -> ARec f rs -> Bool

max :: ARec f rs -> ARec f rs -> ARec f rs

min :: ARec f rs -> ARec f rs -> ARec f rs

(AllConstrained (IndexableField rs) rs, RecApplicative rs, Show (Rec f rs)) => Show (ARec f rs)

Defined in Data.Vinyl.ARec

Methods

showsPrec :: Int -> ARec f rs -> ShowS

show :: ARec f rs -> String

showList :: [ARec f rs] -> ShowS

toARec :: forall f ts. NatToInt (RLength ts) => Rec f ts -> ARec f ts

Convert a Rec into an ARec for constant-time field access.

class NatToInt (RIndex t ts) => IndexableField ts t

Defines a constraint that lets us index into an ARec in order to produce a Rec using fromARec.

Instances

NatToInt (RIndex t ts) => IndexableField (ts :: [k]) (t :: k)

Defined in Data.Vinyl.ARec

fromARec :: forall f ts. (RecApplicative ts, AllConstrained (IndexableField ts) ts) => ARec f ts -> Rec f ts

Convert an ARec into a Rec.

aget :: forall t f ts. NatToInt (RIndex t ts) => ARec f ts -> f t

Get a field from an ARec.

aput :: forall t f ts. NatToInt (RIndex t ts) => f t -> ARec f ts -> ARec f ts

Set a field in an ARec.

alens :: (Functor g, NatToInt (RIndex t ts)) => (f t -> g (f t)) -> ARec f ts -> g (ARec f ts)

Define a lens for a field of an ARec.

arecGetSubset :: forall rs ss f. (IndexWitnesses (RImage rs ss), NatToInt (RLength rs)) => ARec f ss -> ARec f rs

Get a subset of a record's fields.

arecSetSubset :: forall rs ss f. IndexWitnesses (RImage rs ss) => ARec f ss -> ARec f rs -> ARec f ss

Set a subset of a larger record's fields to all of the fields of a smaller record.