| Safe Haskell | None |
|---|
Util.Dynamics
Description
A wrapper for the new GHC (and Hugs) Dynamic module. The main improvement over the original Dynamic module is that we provide flavours of TypeableXXXX for kinds with arguments other than *, a feature used by DisplayView.
- class Typeable a where
- data TypeRep
- type Dyn = Dynamic
- toDyn :: Typeable a => a -> Dyn
- fromDynamic :: Typeable a => Dyn -> Maybe a
- fromDynamicWE :: Typeable a => Dyn -> WithError a
- coerce :: Typeable a => Dyn -> a
- coerceIO :: Typeable a => Dyn -> IO a
- typeMismatch :: IOError
- dynCast :: (Typeable a, Typeable b) => String -> a -> b
- dynCastOpt :: (Typeable a, Typeable b) => a -> Maybe b
Documentation
class Typeable a where
The class Typeable allows a concrete representation of a type to
be calculated.
Methods
Instances
data TypeRep
A concrete representation of a (monomorphic) type. TypeRep
supports reasonably efficient equality.
fromDynamic :: Typeable a => Dyn -> Maybe aSource
fromDynamicWE :: Typeable a => Dyn -> WithError aSource
Like fromDynamic but provides an error message indicating what
types are getting confused.
dynCastOpt :: (Typeable a, Typeable b) => a -> Maybe bSource