Popularity
7.3
Declining
Activity
0.0
Stable
30
3
2

Monthly Downloads: 85
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Tags: Data     Union     Comonads    

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README

Union

Build Status Hackage

Extensible type-safe unions.

ghci> let a = openUnion # (5 :: Int) :: OpenUnion '[Bool, Int]

ghci> a ^? openUnion :: Maybe Int
Just 5

ghci> a ^? openUnion :: Maybe Bool
Nothing

ghci> a ^? openUnion :: Maybe Char
<interactive>:8:6:
    No instance for (UElem Char '[] (RIndex Char '[]))
      arising from a use of ‘openUnion’
    In the second argument of ‘(^?)’, namely ‘openUnion’
    In the expression: a ^? openUnion :: Maybe Char
    In an equation for ‘it’: it = a ^? openUnion :: Maybe Char