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stelleg/withConstArray.hs

Created July 29, 2018 15:56
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alpha-equivalence example
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withConstArray.hs
import Foreign.Ptr
import Foreign.Storable
import Foreign.Marshal.Array
{-@ type PtrLen a n = {v:Ptr a | plen v = n && 0 <= pbase v && 0 <= plen v} @-}
{-@ withArray :: Storable a => x:[a] -> (PtrLen a (len x) -> IO b) -> IO b @-}
{-@ withConstArray :: Storable a => a -> n:Nat -> (PtrLen a n -> IO b) -> IO b @-}
withConstArray x n = withArray (replicate n x)
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