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README
type-sets
Dedication
Obstacles don't have to stop you. If you run into a wall, don't turn around and give up. Figure out how to climb it, go through it, or work around it.
-- Michael Jordan, on complexity analysis in Haskell
Overview
How much do you hate programming at the type level, but only being able to use lists? A million? Two million? Some mathematicians suspect that there may be even larger degrees of hate.
Enter type-sets
. They're sets... at the type-level! Check this:
{-# OPTIONS_GHC -fplugin=Type.Compare.Plugin #-}
import Type.Set
type MySet = Insert Bool (Insert String (Insert (Maybe Int) 'Empty))
test1 :: Proxy (Member Bool MySet) -> Proxy 'True
test1 = id -- Bool is a member :)
test2 :: Proxy (Member Char MySet) -> Proxy 'False
test2 = id -- Char is not a member :(
See the Type.Set
module for more operations.
But wait, there's more! There's also a proof-of-concept Type.Set.Variant
for
describing open-sums indexed by type-sets. PRs to make it better would be
greatly appreciated!
One love.
Acknowledgments
Huge shout-outs to Boris Rozinov for all of his help on this library, including the original idea, help with the implementation, infinite amounts of coffee, and a couch to sleep on while it was being made.