Safe Haskell	None
Language	Haskell2010

Data.Vinyl.ARec

Description

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.

Synopsis

newtype ARec (f :: k -> *) (ts :: [k]) = ARec (Array Int Any)
toARec :: forall f ts. NatToInt (RLength ts) => Rec f ts -> ARec f ts
class NatToInt (RIndex t ts) => IndexableField ts t
fromARec :: forall f ts. (RecApplicative ts, AllConstrained (IndexableField ts) ts) => ARec f ts -> Rec f ts
aget :: forall t f ts. NatToInt (RIndex t ts) => ARec f ts -> f t
aput :: forall t f ts. NatToInt (RIndex t ts) => f t -> ARec f ts -> ARec f ts
alens :: (Functor g, NatToInt (RIndex t ts)) => (f t -> g (f t)) -> ARec f ts -> g (ARec f ts)
arecGetSubset :: forall rs ss f. (IndexWitnesses (RImage rs ss), NatToInt (RLength rs)) => ARec f ss -> ARec f rs
arecSetSubset :: forall rs ss f. IndexWitnesses (RImage rs ss) => ARec f ss -> ARec f rs -> ARec f ss

Documentation

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

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 Source #
Instance details Defined in Data.Vinyl.ARec Methods rlens :: Functor g => sing t -> (f t -> g (f t)) -> ARec f ts -> g (ARec f ts) Source # rget :: sing t -> ARec f ts -> f t Source # rput :: f t -> ARec f ts -> ARec f ts Source #
(is ~ RImage rs ss, IndexWitnesses is, NatToInt (RLength rs)) => RecSubset (ARec :: (k -> ) -> [k] -> ) (rs :: [k]) (ss :: [k]) is Source #
Instance details Defined in Data.Vinyl.ARec Methods rsubset :: Functor g => (ARec f rs -> g (ARec f rs)) -> ARec f ss -> g (ARec f ss) Source # rcast :: ARec f ss -> ARec f rs Source # rreplace :: ARec f rs -> ARec f ss -> ARec f ss Source #
(AllConstrained (IndexableField rs) rs, RecApplicative rs, Eq (Rec f rs)) => Eq (ARec f rs) Source #
Instance details 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) Source #
Instance details 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) Source #
Instance details 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 Source #

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

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

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) Source #
Instance details Defined in Data.Vinyl.ARec

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

Convert an ARec into a Rec.

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

Get a field from an ARec.

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

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) Source #

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 Source #

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 Source #

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