Safe Haskell | Safe-Inferred |
---|---|
Language | Haskell2010 |
Witness isomorphism between b
and HardForkBlock '[b]
Synopsis
- class Isomorphic f where
- project ∷ NoHardForks blk ⇒ f (HardForkBlock '[blk]) → f blk
- inject ∷ NoHardForks blk ⇒ f blk → f (HardForkBlock '[blk])
- inject' ∷ ∀ proxy f x y blk. (Isomorphic f, NoHardForks blk, Coercible x (f blk), Coercible y (f (HardForkBlock '[blk]))) ⇒ proxy (f blk) → x → y
- project' ∷ ∀ proxy f x y blk. (Isomorphic f, NoHardForks blk, Coercible x (f (HardForkBlock '[blk])), Coercible y (f blk)) ⇒ proxy (f blk) → x → y
- data ProjHardForkQuery b ∷ Type → Type where
- ProjHardForkQuery ∷ BlockQuery b result' → ProjHardForkQuery b (HardForkQueryResult '[b] result')
- injNestedCtxt ∷ NestedCtxt f blk a → NestedCtxt f (HardForkBlock '[blk]) a
- injQuery ∷ BlockQuery b result → BlockQuery (HardForkBlock '[b]) (HardForkQueryResult '[b] result)
- injQueryResult ∷ result → HardForkQueryResult '[b] result
- projNestedCtxt ∷ NestedCtxt f (HardForkBlock '[blk]) a → NestedCtxt f blk a
- projQuery ∷ BlockQuery (HardForkBlock '[b]) result → (∀ result'. (result :~: HardForkQueryResult '[b] result') → BlockQuery b result' → a) → a
- projQuery' ∷ BlockQuery (HardForkBlock '[b]) result → ProjHardForkQuery b result
- projQueryResult ∷ HardForkQueryResult '[b] result → result
- newtype I a = I a
- data Proxy (t ∷ k) = Proxy
Documentation
class Isomorphic f where Source #
project ∷ NoHardForks blk ⇒ f (HardForkBlock '[blk]) → f blk Source #
inject ∷ NoHardForks blk ⇒ f blk → f (HardForkBlock '[blk]) Source #
Instances
inject' ∷ ∀ proxy f x y blk. (Isomorphic f, NoHardForks blk, Coercible x (f blk), Coercible y (f (HardForkBlock '[blk]))) ⇒ proxy (f blk) → x → y Source #
project' ∷ ∀ proxy f x y blk. (Isomorphic f, NoHardForks blk, Coercible x (f (HardForkBlock '[blk])), Coercible y (f blk)) ⇒ proxy (f blk) → x → y Source #
Dependent types
data ProjHardForkQuery b ∷ Type → Type where Source #
ProjHardForkQuery ∷ BlockQuery b result' → ProjHardForkQuery b (HardForkQueryResult '[b] result') |
injNestedCtxt ∷ NestedCtxt f blk a → NestedCtxt f (HardForkBlock '[blk]) a Source #
injQuery ∷ BlockQuery b result → BlockQuery (HardForkBlock '[b]) (HardForkQueryResult '[b] result) Source #
Inject BlockQuery
Not an instance of Isomorphic
because the types change.
injQueryResult ∷ result → HardForkQueryResult '[b] result Source #
projNestedCtxt ∷ NestedCtxt f (HardForkBlock '[blk]) a → NestedCtxt f blk a Source #
projQuery ∷ BlockQuery (HardForkBlock '[b]) result → (∀ result'. (result :~: HardForkQueryResult '[b] result') → BlockQuery b result' → a) → a Source #
Project BlockQuery
Not an instance of Isomorphic
because the types change.
projQuery' ∷ BlockQuery (HardForkBlock '[b]) result → ProjHardForkQuery b result Source #
projQueryResult ∷ HardForkQueryResult '[b] result → result Source #
Convenience exports
The identity type functor.
Like Identity
, but with a shorter name.
I a |
Instances
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,
is a safer alternative to the
Proxy
:: Proxy
a
idiom.undefined
:: a
>>>
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