typerep-map
Efficient implementation of a dependent map with types as keys
https://github.com/kowainik/typerep-map
| Version on this page: | 0.3.2@rev:3 |
| LTS Haskell 18.28: | 0.3.3.0 |
| Stackage Nightly 2022-02-27: | 0.4.0.0 |
| Latest on Hackage: | 0.6.0.0 |
Maintained by Kowainik
This version can be pinned in stack with:
typerep-map-0.3.2@sha256:3a3c3dfcc6f6bbd34ade3cb266cc9bfd9ff919d415b2887575ee7c96d51d5e0c,4841Module documentation for 0.3.2
Depends on 5 packages(full list with versions):
Used by 1 package in lts-15.3(full list with versions):
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 this 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 | |
|---|---|---|
DMap TypeRep |
517.5 ns | 779.9 ns |
typerep-map |
205.3 ns | 187.2 ns |
| ghc-8.2.2 | ghc-8.4.3 |
|---|---|
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