Safe Haskell | Safe |
---|---|

Language | Haskell2010 |

- newtype CaseFunc (k :: Type -> Constraint) r (xs :: [Type]) = CaseFunc (forall x. k x => x -> r)
- newtype CaseFunc' (k :: Type -> Constraint) (xs :: [Type]) = CaseFunc' (forall x. k x => x -> x)
- newtype CaseFunc1 (k :: Type -> Constraint) (k1 :: (Type -> Type) -> Constraint) (k0 :: Type -> Constraint) r (xs :: [Type]) = CaseFunc1 (forall f x. (k (f x), k1 f, k0 x) => f x -> f r)
- newtype CaseFunc1' (k :: Type -> Constraint) (k1 :: (Type -> Type) -> Constraint) (k0 :: Type -> Constraint) (xs :: [Type]) = CaseFunc1' (forall f x. (k (f x), k1 f, k0 x) => f x -> f x)

# Documentation

newtype CaseFunc (k :: Type -> Constraint) r (xs :: [Type]) Source #

This handler stores a polymorphic function that returns a different type.

let y =`pick`

(5 :: Int) ::`Which`

'[Int, Bool]`switch`

y (`CaseFunc`

@`Typeable`

(show . typeRep . (pure @Proxy))) `shouldBe` Int

let x = (5 :: Int)`./`

False`./`

'X'`./`

Just 'O'`./`

(6 :: Int)`./`

Just 'A'`./`

`nul`

`afoldr`

(:) [] (`forMany`

(`CaseFunc`

@`Typeable`

(show . typeRep . (pure @Proxy))) x) `shouldBe` ["Int", "Bool", "Char", "Maybe Char", "Int", "Maybe Char"]

CaseFunc (forall x. k x => x -> r) |

newtype CaseFunc' (k :: Type -> Constraint) (xs :: [Type]) Source #

This handler stores a polymorphic function that doesn't change the type.

let x = (5 :: Int)`./`

(6 :: Int8)`./`

(7 :: Int16)`./`

(8 :: Int32)`./`

`nil`

y = (15 :: Int)`./`

(16 :: Int8)`./`

(17 :: Int16)`./`

(18 :: Int32)`./`

`nil`

`afmap`

(`CaseFunc'`

@`Num`

(+10)) x `shouldBe` y

CaseFunc' (forall x. k x => x -> x) |

newtype CaseFunc1 (k :: Type -> Constraint) (k1 :: (Type -> Type) -> Constraint) (k0 :: Type -> Constraint) r (xs :: [Type]) Source #

This handler stores a polymorphic function that work on higher kinds, eg `Functor`

You may want to use `NoContraint for `

k@

CaseFunc1 (forall f x. (k (f x), k1 f, k0 x) => f x -> f r) |

newtype CaseFunc1' (k :: Type -> Constraint) (k1 :: (Type -> Type) -> Constraint) (k0 :: Type -> Constraint) (xs :: [Type]) Source #

A varation of `CaseFunc`

that doesn't change the return type

CaseFunc1' (forall f x. (k (f x), k1 f, k0 x) => f x -> f x) |

Reiterate (CaseFunc1' k k1 k0) xs Source # | |

(k (f x), k1 f, k0 x) => Case (CaseFunc1' k k1 k0) ((:) Type (f x) xs) Source # | |

type CaseResult Type * (CaseFunc1' k k1 k0) (f x) Source # | |