| Safe Haskell | Safe |
|---|---|
| Language | Haskell2010 |
Haskus.Utils.Types.Symbol
Description
Type-level Symbol (i.e. string)
Synopsis
- data Symbol
- symbolValue :: forall (s :: Symbol). KnownSymbol s => String
- class KnownSymbol (n :: Symbol)
- type family CmpSymbol (a :: Symbol) (b :: Symbol) :: Ordering where ...
- data SomeSymbol where
- SomeSymbol :: forall (n :: Symbol). KnownSymbol n => Proxy n -> SomeSymbol
- sameSymbol :: (KnownSymbol a, KnownSymbol b) => Proxy a -> Proxy b -> Maybe (a :~: b)
- someSymbolVal :: String -> SomeSymbol
Documentation
(Kind) This is the kind of type-level symbols. Declared here because class IP needs it
Instances
| SingKind Symbol | Since: base-4.9.0.0 |
Defined in GHC.Generics | |
| KnownSymbol a => SingI (a :: Symbol) | Since: base-4.9.0.0 |
Defined in GHC.Generics Methods sing :: Sing a | |
| data Sing (s :: Symbol) | |
Defined in GHC.Generics | |
| type DemoteRep Symbol | |
Defined in GHC.Generics | |
symbolValue :: forall (s :: Symbol). KnownSymbol s => String Source #
class KnownSymbol (n :: Symbol) #
This class gives the string associated with a type-level symbol. There are instances of the class for every concrete literal: "hello", etc.
Since: base-4.7.0.0
Minimal complete definition
symbolSing
type family CmpSymbol (a :: Symbol) (b :: Symbol) :: Ordering where ... #
Comparison of type-level symbols, as a function.
Since: base-4.7.0.0
data SomeSymbol where #
This type represents unknown type-level symbols.
Constructors
| SomeSymbol :: forall (n :: Symbol). KnownSymbol n => Proxy n -> SomeSymbol | Since: base-4.7.0.0 |
Instances
| Eq SomeSymbol | Since: base-4.7.0.0 |
Defined in GHC.TypeLits | |
| Ord SomeSymbol | Since: base-4.7.0.0 |
Defined in GHC.TypeLits Methods compare :: SomeSymbol -> SomeSymbol -> Ordering # (<) :: SomeSymbol -> SomeSymbol -> Bool # (<=) :: SomeSymbol -> SomeSymbol -> Bool # (>) :: SomeSymbol -> SomeSymbol -> Bool # (>=) :: SomeSymbol -> SomeSymbol -> Bool # max :: SomeSymbol -> SomeSymbol -> SomeSymbol # min :: SomeSymbol -> SomeSymbol -> SomeSymbol # | |
| Read SomeSymbol | Since: base-4.7.0.0 |
Defined in GHC.TypeLits Methods readsPrec :: Int -> ReadS SomeSymbol # readList :: ReadS [SomeSymbol] # readPrec :: ReadPrec SomeSymbol # readListPrec :: ReadPrec [SomeSymbol] # | |
| Show SomeSymbol | Since: base-4.7.0.0 |
Defined in GHC.TypeLits Methods showsPrec :: Int -> SomeSymbol -> ShowS # show :: SomeSymbol -> String # showList :: [SomeSymbol] -> ShowS # | |
sameSymbol :: (KnownSymbol a, KnownSymbol b) => Proxy a -> Proxy b -> Maybe (a :~: b) #
We either get evidence that this function was instantiated with the
same type-level symbols, or Nothing.
Since: base-4.7.0.0
someSymbolVal :: String -> SomeSymbol #
Convert a string into an unknown type-level symbol.
Since: base-4.7.0.0