Jordan.Types.Internal.AccumE

Either, but with an Applicative instance that combines errors via <>.

This is sometimes known as the validation Applicative. There are Haskell packages providing this type, however, in the interest of minimized dependency footprint we use this.

Documentation

newtype AccumE err val

A version of Either that accumulates errors via an instance of Semigroup.

This is sometimes called the validation applicative.

Constructors

AccumE

Fields

• getAccumE :: Either err val

Bundled Patterns

pattern AccumEL :: err -> AccumE err val

Construct an error value.

pattern AccumER :: val -> AccumE err val

Construct a good value. Equivalent to pure.

Instances

Bifunctor AccumE

Defined in Jordan.Types.Internal.AccumE

Methods

bimap :: (a -> b) -> (c -> d) -> AccumE a c -> AccumE b d

first :: (a -> b) -> AccumE a c -> AccumE b c

second :: (b -> c) -> AccumE a b -> AccumE a c

Functor (AccumE err)

Defined in Jordan.Types.Internal.AccumE

Methods

fmap :: (a -> b) -> AccumE err a -> AccumE err b

(<$) :: a -> AccumE err b -> AccumE err a

Semigroup e => Applicative (AccumE e)

Applicative accumulates errors.

Note that this is *strict* in the error, because this can sometimes reduce the number of allocations in the places where we use this.

Defined in Jordan.Types.Internal.AccumE

Methods

pure :: a -> AccumE e a

(<*>) :: AccumE e (a -> b) -> AccumE e a -> AccumE e b

liftA2 :: (a -> b -> c) -> AccumE e a -> AccumE e b -> AccumE e c

(*>) :: AccumE e a -> AccumE e b -> AccumE e b

(<*) :: AccumE e a -> AccumE e b -> AccumE e a

Monoid m => Alternative (AccumE m)

Alternative takes the first result if there is a result. If there is not, will *not* accumulate errors.

Defined in Jordan.Types.Internal.AccumE

Methods

empty :: AccumE m a

(<|>) :: AccumE m a -> AccumE m a -> AccumE m a

some :: AccumE m a -> AccumE m [a]

many :: AccumE m a -> AccumE m [a]

(Read a, Read b) => Read (AccumE a b)

Read instance uses the AccumER and AccumEL pattern synonyms.

Defined in Jordan.Types.Internal.AccumE

Methods

readsPrec :: Int -> ReadS (AccumE a b)

readList :: ReadS [AccumE a b]

readPrec :: ReadPrec (AccumE a b)

readListPrec :: ReadPrec [AccumE a b]

(Show a, Show b) => Show (AccumE a b)

Show instance uses the AccumER and AccumEL pattern synonyms.

Defined in Jordan.Types.Internal.AccumE

Methods

showsPrec :: Int -> AccumE a b -> ShowS

show :: AccumE a b -> String

showList :: [AccumE a b] -> ShowS

Generic (AccumE err val)

Defined in Jordan.Types.Internal.AccumE

Associated Types

type Rep (AccumE err val) :: Type -> Type

Methods

from :: AccumE err val -> Rep (AccumE err val) x

to :: Rep (AccumE err val) x -> AccumE err val

Semigroup e => Semigroup (AccumE e a)

Semigroup accumulates errors if both are errors, otherwise it returns the first good value.

Defined in Jordan.Types.Internal.AccumE

Methods

(<>) :: AccumE e a -> AccumE e a -> AccumE e a

sconcat :: NonEmpty (AccumE e a) -> AccumE e a

stimes :: Integral b => b -> AccumE e a -> AccumE e a

Monoid err => Monoid (AccumE err a)

Defined in Jordan.Types.Internal.AccumE

Methods

mempty :: AccumE err a

mappend :: AccumE err a -> AccumE err a -> AccumE err a

mconcat :: [AccumE err a] -> AccumE err a

type Rep (AccumE err val)

Defined in Jordan.Types.Internal.AccumE

type Rep (AccumE err val) = D1 ('MetaData "AccumE" "Jordan.Types.Internal.AccumE" "jordan-0.2.0.0-He2CL9yJm8jJiPwP3VkPys" 'True) (C1 ('MetaCons "AccumE" 'PrefixI 'True) (S1 ('MetaSel ('Just "getAccumE") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Either err val))))