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README
typerep-map
typerep-map
introduces TMap
and TypeRepMap
— data structures like Map
, but where types serve as keys, and values have the types specified in the corresponding key spots.
For the more details on the implementation see the following blog post:
Usage example
ghci> import Data.TMap
ghci> tm = insert True $ one (42 :: Int)
ghci> size tm
2
ghci> res = lookup tm
ghci> res :: Maybe Int
Just 42
ghci> res :: Maybe Bool
Just True
ghci> res :: Maybe String
Nothing
ghci> lookup (insert "hello" tm) :: Maybe String
Just "hello"
ghci> member @Int tm
True
ghci> tm' = delete @Int tm
ghci> member @Int tm'
False
Benchmarks
Tables below contain comparision with DMap TypeRep
of ten lookup
operations
on structure with size 10^4
:
ghc-8.2.2 | ghc-8.4.3 | ghc-8.8.3 | ghc-8.10.1 | |
---|---|---|---|---|
DMap TypeRep |
517.5 ns | 779.9 ns | 1.559 μs | 1.786 μs |
typerep-map |
205.3 ns | 187.2 ns | 190.1 ns | 169.1 ns |
ghc-8.2.2 | ghc-8.4.3 |
---|---|
*Note that all licence references and agreements mentioned in the typerep-map README section above
are relevant to that project's source code only.