File: stableptr001.hs

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module Main where

import Foreign

-- simple test for building/dereferencing stable ptrs

main
  = do  l <- mapM newStablePtr [1..100000]
        sum <- stable_sum l
        print sum

stable_sum :: [StablePtr Integer] -> IO Integer
stable_sum [] = return 0
stable_sum (x:xs)
  = do  x'  <- deRefStablePtr x
        freeStablePtr x
        xs' <- stable_sum xs
        return (x' + xs')