hGet package:hset

Gets any data from HSet for you

Heterogeneous read arbitrarily element from hset

>>> let x = HSCons (10 :: Int) $ HSCons (20 :: Double) HSNil

>>> x
HSCons (10) (HSCons (20.0) (HSNil))

>>> hget x :: Int
10

>>> hget x :: Double
20.0

Note that hget takes specific element from list of uniquely typed elements depending on what type is required to be returned (return type polymorphism)

>>> let y = HSCons (Tagged 10 :: Tagged "x" Int) $ HSCons (Tagged 20 :: Tagged "y" Int) HSNil

>>> y
HSCons (Tagged 10) (HSCons (Tagged 20) (HSNil))

>>> hgetTagged (Proxy :: Proxy "x") y :: Int
10

>>> hgetTagged (Proxy :: Proxy "y") y :: Int
20

Enables deriving of the fact that e is contained within els and it's safe to say that hget can be performed on this particular pair.