Safe Haskell	None
Language	Haskell2010

Capability.Reflection

Contents

Description

Use this module to provide an ad-hoc interpreter for a capability using type class reflection.

Use the functions interpret_ or interpret for ad-hoc interpretation of capabilities.

Refer to Reflected if you would like to enable reflection for a new capability.

More complex examples using this module can be found in the Reflection example module.

For details on reflection refer to the tutorial at https://www.tweag.io/posts/2017-12-21-reflection-tutorial.html and the reflection library at https://hackage.haskell.org/package/reflection.

Synopsis

interpret_ :: forall tag c m a. (Monad m, forall s. Reifies s (Reified tag c m) => c (Reflected s c m)) => Reified tag c m -> (forall m'. c m' => m' a) -> m a
interpret :: forall tag (cs :: [Capability]) c m a. (Monad m, All cs m, forall s. Reifies s (Reified tag c m) => c (Reflected s c m)) => Reified tag c m -> (forall m'. All (c ': cs) m' => m' a) -> m a
data family Reified (tag :: k) (c :: Capability) (m :: Type -> Type)
newtype Reflected (s :: Type) (c :: Capability) (m :: Type -> Type) (a :: Type) = Reflect (m a)
reified :: forall s tag c m. Reifies s (Reified tag c m) => Reified tag c m
class Reifies (s :: k) a | s -> a
reify :: a -> (forall s. Reifies s a => Proxy s -> r) -> r
reflect :: Reifies s a => proxy s -> a
data Proxy (t :: k) = Proxy

Reflection

interpret_ :: forall tag c m a. (Monad m, forall s. Reifies s (Reified tag c m) => c (Reflected s c m)) => Reified tag c m -> (forall m'. c m' => m' a) -> m a Source #

interpret_ @tag dict action

Execute action using the ad-hoc interpretation of a capability c under tag defined by dict, where dict is a value of type Reified tag c, i.e. a record providing the implementation of the methods of capability c.

For example, the following provides an ad-hoc interpretation for the HasSource capability.

>>> :{
  interpret_ @"my-source"
    ReifiedSource { _await = pure "capabilities" }
    (replicateM 3 (await @"my-source"))
  :}
["capabilities", "capabilities", "capabilities"]

interpret :: forall tag (cs :: [Capability]) c m a. (Monad m, All cs m, forall s. Reifies s (Reified tag c m) => c (Reflected s c m)) => Reified tag c m -> (forall m'. All (c ': cs) m' => m' a) -> m a Source #

interpret @tag @ambient dict action

Like interpret_ but forwards the ambient capabilities ambient into the context of action as well.

For example, the following provides an ad-hoc interpretation for the HasSource capability, while using an ambient HasSink capability.

>>> :{
  interpret @"my-source" @'[HasSink "my-sink" String]
    ReifiedSource { _await = pure "capabilities" }
    (replicateM_ 3 (await @"my-source" >>= yield @"my-sink"))
  :}

data family Reified (tag :: k) (c :: Capability) (m :: Type -> Type) Source #

Reified tag capability m

Defines the dictionary type for the methods of capability under tag in the monad m. Refer to interpret_ for an example use-case.

For example, the HasSink capability has the method yield :: a -> m (). The corresponding dictionary type is defined as follows.

>>> :{
  data instance Reified tag (HasSink tag a) m =
    ReifiedSink { _yield :: forall a. a -> m () }
  :}

Superclass dictionaries are represented as nested records. For example, the HasState capability has the superclasses HasSource and HasSink and the method state :: (s -> (a, s)) -> m a. The corresponding dictionary type is defined as follows.

>>> :{
  data instance Reified tag (HasState tag s) m =
    ReifiedState
      { _stateSource :: Reified tag (HasSource tag s) m,
        _stateSink :: Reified tag (HasSink tag s) m,
        _state :: forall a. (s -> (a, s)) -> m a
      }
  :}

Instances

Instances details

data Reified (tag :: k) (HasSink tag a) m Source #
Instance details Defined in Capability.Sink.Internal.Class data Reified (tag :: k) (HasSink tag a) m = ReifiedSink { _yield :: a -> m () }
data Reified (tag :: k) (HasSource tag a) m Source #
Instance details Defined in Capability.Source.Internal.Class data Reified (tag :: k) (HasSource tag a) m = ReifiedSource { _await :: m a }
data Reified (tag :: k) (HasReader tag r) m Source #
Instance details Defined in Capability.Reader.Internal.Class data Reified (tag :: k) (HasReader tag r) m = ReifiedReader { _readerSource :: Reified tag (HasSource tag r) m _local :: forall a. (r -> r) -> m a -> m a _reader :: forall a. (r -> a) -> m a }
data Reified (tag :: k) (HasState tag s) m Source #
Instance details Defined in Capability.State.Internal.Class data Reified (tag :: k) (HasState tag s) m = ReifiedState { _stateSource :: Reified tag (HasSource tag s) m _stateSink :: Reified tag (HasSink tag s) m _state :: forall a. (s -> (a, s)) -> m a }
data Reified (tag :: k) (HasThrow tag e) m Source #
Instance details Defined in Capability.Error data Reified (tag :: k) (HasThrow tag e) m = ReifiedThrow { _throw :: forall a. e -> m a }
data Reified (tag :: k) (HasCatch tag e) m Source #
Instance details Defined in Capability.Error data Reified (tag :: k) (HasCatch tag e) m = ReifiedCatch { _catchThrow :: Reified tag (HasThrow tag e) m _catch :: forall a. m a -> (e -> m a) -> m a _catchJust :: forall a b. (e -> Maybe b) -> m a -> (b -> m a) -> m a }
data Reified (tag :: k) (HasWriter tag w) m Source #
Instance details Defined in Capability.Writer data Reified (tag :: k) (HasWriter tag w) m = ReifiedWriter { _writerSink :: Reified tag (HasSink tag w) m _writer :: forall a. (a, w) -> m a _listen :: forall a. m a -> m (a, w) _pass :: forall a. m (a, w -> w) -> m a }

newtype Reflected (s :: Type) (c :: Capability) (m :: Type -> Type) (a :: Type) Source #

Reflected s capability m

Carries the type class instance for capability in the monad m defined by the dictionary reflected in s in the type system.

For most use-cases it is not necessary to use this type directly. Use interpret_ or interpret instead.

If you wish to enable reflection for a new capability, then you will need to define a type class instance for Reflected for the new capability. Note, you will also need to define an instance of Reified which defines the dictionary type of the new capability. Hint, you can use reified @s to obtain the dictionary from the context in the instance implementation.

For example, the Reflected instance for the HasSink capability can be defined as follows. Assuming the dictionary described in Reified.

>>> :{
  instance
    (Monad m, Reifies s (Reified tag (HasSink tag a) m)) =>
    HasSink tag a (Reflected s (HasSink tag a) m)
    where
    yield a = Reflect $ _yield (reified @s) a
  :}

Constructors

Reflect (m a)

Instances

Instances details

(Monad m, Reifies s (Reified tag (HasSink tag a) m)) => HasSink (tag :: k) a (Reflected s (HasSink tag a) m) Source #
Instance details Defined in Capability.Sink.Internal.Class Methods yield_ :: Proxy# tag -> a -> Reflected s (HasSink tag a) m () Source #
(Monad m, Reifies s' (Reified tag (HasState tag s) m)) => HasSink (tag :: k) s (Reflected s' (HasState tag s) m) Source #
Instance details Defined in Capability.State.Internal.Class Methods yield_ :: Proxy# tag -> s -> Reflected s' (HasState tag s) m () Source #
(Monoid w, Monad m, Reifies s (Reified tag (HasWriter tag w) m)) => HasSink (tag :: k) w (Reflected s (HasWriter tag w) m) Source #
Instance details Defined in Capability.Writer Methods yield_ :: Proxy# tag -> w -> Reflected s (HasWriter tag w) m () Source #
(Monad m, Reifies s (Reified tag (HasSource tag a) m)) => HasSource (tag :: k) a (Reflected s (HasSource tag a) m) Source #
Instance details Defined in Capability.Source.Internal.Class Methods await_ :: Proxy# tag -> Reflected s (HasSource tag a) m a Source #
(Monad m, Reifies s (Reified tag (HasReader tag r) m)) => HasSource (tag :: k) r (Reflected s (HasReader tag r) m) Source #
Instance details Defined in Capability.Reader.Internal.Class Methods await_ :: Proxy# tag -> Reflected s (HasReader tag r) m r Source #
(Monad m, Reifies s' (Reified tag (HasState tag s) m)) => HasSource (tag :: k) s (Reflected s' (HasState tag s) m) Source #
Instance details Defined in Capability.State.Internal.Class Methods await_ :: Proxy# tag -> Reflected s' (HasState tag s) m s Source #
(Monad m, Reifies s (Reified tag (HasReader tag r) m)) => HasReader (tag :: k) r (Reflected s (HasReader tag r) m) Source #
Instance details Defined in Capability.Reader.Internal.Class Methods local_ :: Proxy# tag -> (r -> r) -> Reflected s (HasReader tag r) m a -> Reflected s (HasReader tag r) m a Source # reader_ :: Proxy# tag -> (r -> a) -> Reflected s (HasReader tag r) m a Source #
(Monad m, Reifies s' (Reified tag (HasState tag s) m)) => HasState (tag :: k) s (Reflected s' (HasState tag s) m) Source #
Instance details Defined in Capability.State.Internal.Class Methods state_ :: Proxy# tag -> (s -> (a, s)) -> Reflected s' (HasState tag s) m a Source #
(Monad m, Reifies s (Reified tag (HasCatch tag e) m)) => HasCatch (tag :: k) e (Reflected s (HasCatch tag e) m) Source #
Instance details Defined in Capability.Error Methods catch_ :: Proxy# tag -> Reflected s (HasCatch tag e) m a -> (e -> Reflected s (HasCatch tag e) m a) -> Reflected s (HasCatch tag e) m a Source # catchJust_ :: Proxy# tag -> (e -> Maybe b) -> Reflected s (HasCatch tag e) m a -> (b -> Reflected s (HasCatch tag e) m a) -> Reflected s (HasCatch tag e) m a Source #
(Monad m, Reifies s (Reified tag (HasThrow tag e) m)) => HasThrow (tag :: k) e (Reflected s (HasThrow tag e) m) Source #
Instance details Defined in Capability.Error Methods throw_ :: Proxy# tag -> e -> Reflected s (HasThrow tag e) m a Source #
(Monad m, Reifies s (Reified tag (HasCatch tag e) m)) => HasThrow (tag :: k) e (Reflected s (HasCatch tag e) m) Source #
Instance details Defined in Capability.Error Methods throw_ :: Proxy# tag -> e -> Reflected s (HasCatch tag e) m a Source #
(Monad m, Monoid w, Reifies s (Reified tag (HasWriter tag w) m)) => HasWriter (tag :: k) w (Reflected s (HasWriter tag w) m) Source #
Instance details Defined in Capability.Writer Methods writer_ :: Proxy# tag -> (a, w) -> Reflected s (HasWriter tag w) m a Source # listen_ :: Proxy# tag -> Reflected s (HasWriter tag w) m a -> Reflected s (HasWriter tag w) m (a, w) Source # pass_ :: Proxy# tag -> Reflected s (HasWriter tag w) m (a, w -> w) -> Reflected s (HasWriter tag w) m a Source #
Monad m => Monad (Reflected s c m) Source #
Instance details Defined in Capability.Reflection Methods (>>=) :: Reflected s c m a -> (a -> Reflected s c m b) -> Reflected s c m b # (>>) :: Reflected s c m a -> Reflected s c m b -> Reflected s c m b # return :: a -> Reflected s c m a #
Functor m => Functor (Reflected s c m) Source #
Instance details Defined in Capability.Reflection Methods fmap :: (a -> b) -> Reflected s c m a -> Reflected s c m b # (<$) :: a -> Reflected s c m b -> Reflected s c m a #
Applicative m => Applicative (Reflected s c m) Source #
Instance details Defined in Capability.Reflection Methods pure :: a -> Reflected s c m a # (<>) :: Reflected s c m (a -> b) -> Reflected s c m a -> Reflected s c m b # liftA2 :: (a -> b -> c0) -> Reflected s c m a -> Reflected s c m b -> Reflected s c m c0 # (>) :: Reflected s c m a -> Reflected s c m b -> Reflected s c m b # (<*) :: Reflected s c m a -> Reflected s c m b -> Reflected s c m a #

reified :: forall s tag c m. Reifies s (Reified tag c m) => Reified tag c m Source #

reified @s

Obtain the dictionary that is reflected in the type system under s.

This is a convenience wrapper around reflect.

Re-exported

class Reifies (s :: k) a | s -> a #

Minimal complete definition

reflect

Instances

Instances details

KnownNat n => Reifies (n :: Nat) Integer
Instance details Defined in Data.Reflection Methods reflect :: proxy n -> Integer #
KnownSymbol n => Reifies (n :: Symbol) String
Instance details Defined in Data.Reflection Methods reflect :: proxy n -> String #
Reifies Z Int
Instance details Defined in Data.Reflection Methods reflect :: proxy Z -> Int #
Reifies n Int => Reifies (D n :: Type) Int
Instance details Defined in Data.Reflection Methods reflect :: proxy (D n) -> Int #
Reifies n Int => Reifies (SD n :: Type) Int
Instance details Defined in Data.Reflection Methods reflect :: proxy (SD n) -> Int #
Reifies n Int => Reifies (PD n :: Type) Int
Instance details Defined in Data.Reflection Methods reflect :: proxy (PD n) -> Int #
(B b0, B b1, B b2, B b3, B b4, B b5, B b6, B b7, w0 ~ W b0 b1 b2 b3, w1 ~ W b4 b5 b6 b7) => Reifies (Stable w0 w1 a :: Type) a
Instance details Defined in Data.Reflection Methods reflect :: proxy (Stable w0 w1 a) -> a #

reify :: a -> (forall s. Reifies s a => Proxy s -> r) -> r #

Reify a value at the type level, to be recovered with reflect.

reflect :: Reifies s a => proxy s -> a #

Recover a value inside a reify context, given a proxy for its reified type.

data Proxy (t :: k) #

Proxy is a type that holds no data, but has a phantom parameter of arbitrary type (or even kind). Its use is to provide type information, even though there is no value available of that type (or it may be too costly to create one).

Historically, Proxy :: Proxy a is a safer alternative to the undefined :: a idiom.

>>> Proxy :: Proxy (Void, Int -> Int)
Proxy

Proxy can even hold types of higher kinds,

>>> Proxy :: Proxy Either
Proxy

>>> Proxy :: Proxy Functor
Proxy

>>> Proxy :: Proxy complicatedStructure
Proxy

Constructors

Proxy

Instances

Instances details

Generic1 (Proxy :: k -> Type)	Since: base-4.6.0.0
Instance details Defined in GHC.Generics Associated Types type Rep1 Proxy :: k -> Type # Methods from1 :: forall (a :: k0). Proxy a -> Rep1 Proxy a # to1 :: forall (a :: k0). Rep1 Proxy a -> Proxy a #
Monad (Proxy :: Type -> Type)	Since: base-4.7.0.0
Instance details Defined in Data.Proxy Methods (>>=) :: Proxy a -> (a -> Proxy b) -> Proxy b # (>>) :: Proxy a -> Proxy b -> Proxy b # return :: a -> Proxy a #
Functor (Proxy :: Type -> Type)	Since: base-4.7.0.0
Instance details Defined in Data.Proxy Methods fmap :: (a -> b) -> Proxy a -> Proxy b # (<$) :: a -> Proxy b -> Proxy a #
Applicative (Proxy :: Type -> Type)	Since: base-4.7.0.0
Instance details Defined in Data.Proxy Methods pure :: a -> Proxy a # (<>) :: Proxy (a -> b) -> Proxy a -> Proxy b # liftA2 :: (a -> b -> c) -> Proxy a -> Proxy b -> Proxy c # (>) :: Proxy a -> Proxy b -> Proxy b # (<*) :: Proxy a -> Proxy b -> Proxy a #
Foldable (Proxy :: Type -> Type)	Since: base-4.7.0.0
Instance details Defined in Data.Foldable Methods fold :: Monoid m => Proxy m -> m # foldMap :: Monoid m => (a -> m) -> Proxy a -> m # foldMap' :: Monoid m => (a -> m) -> Proxy a -> m # foldr :: (a -> b -> b) -> b -> Proxy a -> b # foldr' :: (a -> b -> b) -> b -> Proxy a -> b # foldl :: (b -> a -> b) -> b -> Proxy a -> b # foldl' :: (b -> a -> b) -> b -> Proxy a -> b # foldr1 :: (a -> a -> a) -> Proxy a -> a # foldl1 :: (a -> a -> a) -> Proxy a -> a # toList :: Proxy a -> [a] # null :: Proxy a -> Bool # length :: Proxy a -> Int # elem :: Eq a => a -> Proxy a -> Bool # maximum :: Ord a => Proxy a -> a # minimum :: Ord a => Proxy a -> a # sum :: Num a => Proxy a -> a # product :: Num a => Proxy a -> a #
Traversable (Proxy :: Type -> Type)	Since: base-4.7.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a -> f b) -> Proxy a -> f (Proxy b) # sequenceA :: Applicative f => Proxy (f a) -> f (Proxy a) # mapM :: Monad m => (a -> m b) -> Proxy a -> m (Proxy b) # sequence :: Monad m => Proxy (m a) -> m (Proxy a) #
Representable (Proxy :: Type -> Type)
Instance details Defined in Data.Functor.Rep Associated Types type Rep Proxy # Methods tabulate :: (Rep Proxy -> a) -> Proxy a # index :: Proxy a -> Rep Proxy -> a #
Eq1 (Proxy :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftEq :: (a -> b -> Bool) -> Proxy a -> Proxy b -> Bool #
Ord1 (Proxy :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftCompare :: (a -> b -> Ordering) -> Proxy a -> Proxy b -> Ordering #
Read1 (Proxy :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftReadsPrec :: (Int -> ReadS a) -> ReadS [a] -> Int -> ReadS (Proxy a) # liftReadList :: (Int -> ReadS a) -> ReadS [a] -> ReadS [Proxy a] # liftReadPrec :: ReadPrec a -> ReadPrec [a] -> ReadPrec (Proxy a) # liftReadListPrec :: ReadPrec a -> ReadPrec [a] -> ReadPrec [Proxy a] #
Show1 (Proxy :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Functor.Classes Methods liftShowsPrec :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> Int -> Proxy a -> ShowS # liftShowList :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> [Proxy a] -> ShowS #
Alternative (Proxy :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Proxy Methods empty :: Proxy a # (<\|>) :: Proxy a -> Proxy a -> Proxy a # some :: Proxy a -> Proxy [a] # many :: Proxy a -> Proxy [a] #
MonadPlus (Proxy :: Type -> Type)	Since: base-4.9.0.0
Instance details Defined in Data.Proxy Methods mzero :: Proxy a # mplus :: Proxy a -> Proxy a -> Proxy a #
Hashable1 (Proxy :: Type -> Type)
Instance details Defined in Data.Hashable.Class Methods liftHashWithSalt :: (Int -> a -> Int) -> Int -> Proxy a -> Int #
Bounded (Proxy t)	Since: base-4.7.0.0
Instance details Defined in Data.Proxy Methods minBound :: Proxy t # maxBound :: Proxy t #
Enum (Proxy s)	Since: base-4.7.0.0
Instance details Defined in Data.Proxy Methods succ :: Proxy s -> Proxy s # pred :: Proxy s -> Proxy s # toEnum :: Int -> Proxy s # fromEnum :: Proxy s -> Int # enumFrom :: Proxy s -> [Proxy s] # enumFromThen :: Proxy s -> Proxy s -> [Proxy s] # enumFromTo :: Proxy s -> Proxy s -> [Proxy s] # enumFromThenTo :: Proxy s -> Proxy s -> Proxy s -> [Proxy s] #
Eq (Proxy s)	Since: base-4.7.0.0
Instance details Defined in Data.Proxy Methods (==) :: Proxy s -> Proxy s -> Bool # (/=) :: Proxy s -> Proxy s -> Bool #
Ord (Proxy s)	Since: base-4.7.0.0
Instance details Defined in Data.Proxy Methods compare :: Proxy s -> Proxy s -> Ordering # (<) :: Proxy s -> Proxy s -> Bool # (<=) :: Proxy s -> Proxy s -> Bool # (>) :: Proxy s -> Proxy s -> Bool # (>=) :: Proxy s -> Proxy s -> Bool # max :: Proxy s -> Proxy s -> Proxy s # min :: Proxy s -> Proxy s -> Proxy s #
Read (Proxy t)	Since: base-4.7.0.0
Instance details Defined in Data.Proxy Methods readsPrec :: Int -> ReadS (Proxy t) # readList :: ReadS [Proxy t] # readPrec :: ReadPrec (Proxy t) # readListPrec :: ReadPrec [Proxy t] #
Show (Proxy s)	Since: base-4.7.0.0
Instance details Defined in Data.Proxy Methods showsPrec :: Int -> Proxy s -> ShowS # show :: Proxy s -> String # showList :: [Proxy s] -> ShowS #
Ix (Proxy s)	Since: base-4.7.0.0
Instance details Defined in Data.Proxy Methods range :: (Proxy s, Proxy s) -> [Proxy s] # index :: (Proxy s, Proxy s) -> Proxy s -> Int # unsafeIndex :: (Proxy s, Proxy s) -> Proxy s -> Int # inRange :: (Proxy s, Proxy s) -> Proxy s -> Bool # rangeSize :: (Proxy s, Proxy s) -> Int # unsafeRangeSize :: (Proxy s, Proxy s) -> Int #
Generic (Proxy t)	Since: base-4.6.0.0
Instance details Defined in GHC.Generics Associated Types type Rep (Proxy t) :: Type -> Type # Methods from :: Proxy t -> Rep (Proxy t) x # to :: Rep (Proxy t) x -> Proxy t #
Semigroup (Proxy s)	Since: base-4.9.0.0
Instance details Defined in Data.Proxy Methods (<>) :: Proxy s -> Proxy s -> Proxy s # sconcat :: NonEmpty (Proxy s) -> Proxy s # stimes :: Integral b => b -> Proxy s -> Proxy s #
Monoid (Proxy s)	Since: base-4.7.0.0
Instance details Defined in Data.Proxy Methods mempty :: Proxy s # mappend :: Proxy s -> Proxy s -> Proxy s # mconcat :: [Proxy s] -> Proxy s #
Hashable (Proxy a)
Instance details Defined in Data.Hashable.Class Methods hashWithSalt :: Int -> Proxy a -> Int # hash :: Proxy a -> Int #
MonoFunctor (Proxy a)	Since: mono-traversable-1.0.11.0
Instance details Defined in Data.MonoTraversable Methods omap :: (Element (Proxy a) -> Element (Proxy a)) -> Proxy a -> Proxy a #
MonoFoldable (Proxy a)	Since: mono-traversable-1.0.11.0
Instance details Defined in Data.MonoTraversable Methods ofoldMap :: Monoid m => (Element (Proxy a) -> m) -> Proxy a -> m # ofoldr :: (Element (Proxy a) -> b -> b) -> b -> Proxy a -> b # ofoldl' :: (a0 -> Element (Proxy a) -> a0) -> a0 -> Proxy a -> a0 # otoList :: Proxy a -> [Element (Proxy a)] # oall :: (Element (Proxy a) -> Bool) -> Proxy a -> Bool # oany :: (Element (Proxy a) -> Bool) -> Proxy a -> Bool # onull :: Proxy a -> Bool # olength :: Proxy a -> Int # olength64 :: Proxy a -> Int64 # ocompareLength :: Integral i => Proxy a -> i -> Ordering # otraverse_ :: Applicative f => (Element (Proxy a) -> f b) -> Proxy a -> f () # ofor_ :: Applicative f => Proxy a -> (Element (Proxy a) -> f b) -> f () # omapM_ :: Applicative m => (Element (Proxy a) -> m ()) -> Proxy a -> m () # oforM_ :: Applicative m => Proxy a -> (Element (Proxy a) -> m ()) -> m () # ofoldlM :: Monad m => (a0 -> Element (Proxy a) -> m a0) -> a0 -> Proxy a -> m a0 # ofoldMap1Ex :: Semigroup m => (Element (Proxy a) -> m) -> Proxy a -> m # ofoldr1Ex :: (Element (Proxy a) -> Element (Proxy a) -> Element (Proxy a)) -> Proxy a -> Element (Proxy a) # ofoldl1Ex' :: (Element (Proxy a) -> Element (Proxy a) -> Element (Proxy a)) -> Proxy a -> Element (Proxy a) # headEx :: Proxy a -> Element (Proxy a) # lastEx :: Proxy a -> Element (Proxy a) # unsafeHead :: Proxy a -> Element (Proxy a) # unsafeLast :: Proxy a -> Element (Proxy a) # maximumByEx :: (Element (Proxy a) -> Element (Proxy a) -> Ordering) -> Proxy a -> Element (Proxy a) # minimumByEx :: (Element (Proxy a) -> Element (Proxy a) -> Ordering) -> Proxy a -> Element (Proxy a) # oelem :: Element (Proxy a) -> Proxy a -> Bool # onotElem :: Element (Proxy a) -> Proxy a -> Bool #
MonoTraversable (Proxy a)	Since: mono-traversable-1.0.11.0
Instance details Defined in Data.MonoTraversable Methods otraverse :: Applicative f => (Element (Proxy a) -> f (Element (Proxy a))) -> Proxy a -> f (Proxy a) # omapM :: Applicative m => (Element (Proxy a) -> m (Element (Proxy a))) -> Proxy a -> m (Proxy a) #
MonoPointed (Proxy a)	Since: mono-traversable-1.0.11.0
Instance details Defined in Data.MonoTraversable Methods opoint :: Element (Proxy a) -> Proxy a #
type Rep1 (Proxy :: k -> Type)
Instance details Defined in GHC.Generics type Rep1 (Proxy :: k -> Type) = D1 ('MetaData "Proxy" "Data.Proxy" "base" 'False) (C1 ('MetaCons "Proxy" 'PrefixI 'False) (U1 :: k -> Type))
type Rep (Proxy :: Type -> Type)
Instance details Defined in Data.Functor.Rep type Rep (Proxy :: Type -> Type) = Void
type Rep (Proxy t)
Instance details Defined in GHC.Generics type Rep (Proxy t) = D1 ('MetaData "Proxy" "Data.Proxy" "base" 'False) (C1 ('MetaCons "Proxy" 'PrefixI 'False) (U1 :: Type -> Type))
type Element (Proxy a)
Instance details Defined in Data.MonoTraversable type Element (Proxy a) = a