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Export orphan ST Applicative instance from base-orphans #3

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Export orphan ST Applicative instance from base-orphans #3

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9 changes: 2 additions & 7 deletions src/Data/Union/ST.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@
--
-- Authors: Bertram Felgenhauer

{-# LANGUAGE RankNTypes, FlexibleContexts, CPP #-}
{-# LANGUAGE RankNTypes, FlexibleContexts #-}
-- |
-- Low-level interface for managing a disjoint set data structure, based on
-- 'Control.Monad.ST'. For a higher level convenience interface, look at
Expand Down Expand Up @@ -31,6 +31,7 @@ import Control.Applicative
import Data.Array.Base hiding (unsafeFreeze)
import Data.Array.ST hiding (unsafeFreeze)
import qualified Data.Array.Base as A (unsafeFreeze)
import Data.Orphans ()

-- | A disjoint set forest, with nodes numbered from 0, which can carry labels.
data UnionST s l = UnionST {
Expand All @@ -41,12 +42,6 @@ data UnionST s l = UnionST {
def :: l
}

#if __GLASGOW_HASKELL__ < 702
instance Applicative (ST s) where
(<*>) = ap
pure = return
#endif

-- Use http://www.haskell.org/pipermail/libraries/2008-March/009465.html ?

-- | Analogous to 'Data.Array.ST.runSTArray'.
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3 changes: 2 additions & 1 deletion union-find-array.cabal
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Expand Up @@ -34,7 +34,8 @@ library
build-depends:
array >= 0.3 && < 0.6,
mtl >= 1.1 && < 2.3,
base >= 4 && < 5
base >= 4 && < 5,
base-orphans >= 0.1 && < 0.4
extensions:
GeneralizedNewtypeDeriving
RankNTypes
Expand Down