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    <p>Given the following additional Haskell module:</p> <pre><code>module AllocSymbols ( (↑≣), -- mallocArray (≣⊠), -- free (≣→), -- peekElemOff (≣←), -- pokeElemOff (⥱), -- peekElemOff unsafe (⥅), -- advancePtr ) where import GHC.Ptr import System.IO.Unsafe import Foreign.Storable import Foreign.Marshal.Alloc (free) import Foreign.Marshal.Array (↑≣) :: Storable a ⇒ Int → IO (Ptr a) (↑≣) = mallocArray (⥱) :: Storable a ⇒ Ptr a → Int → a a ⥱ i = unsafePerformIO $ peekElemOff a i (≣→) :: Storable a ⇒ Ptr a → Int → IO a (≣→) = peekElemOff (≣←) :: Storable a ⇒ Ptr a → Int → a → IO () (≣←) = pokeElemOff (⥅) :: Storable a ⇒ Ptr a → Int → Ptr a (⥅) = advancePtr (≣⊠) :: Ptr a → IO () (≣⊠) = Foreign.Marshal.Alloc.free </code></pre> <hr> <p>And now we can port this piece of Fortran code:</p> <pre><code> PROGRAM Test IMPLICIT NONE REAL t, ta(2), etime INTEGER i DOUBLE PRECISION x do i = 1, 10000 x = sin( cos( i * 1.0 d0 ) ) print *, x enddo ta(1) = 0.0d0 ta(2) = 0.0d0 t = etime( ta ) PRINT *, 'user time: ', ta(1) PRINT *, 'system time: ', ta(2) PRINT *, 'process time: ', t END </code></pre> <p>word for word to Haskell:</p> <pre><code>module Main where import GHC.Ptr import AllocSymbols import Control.Monad foreign import ccall etime_ :: Ptr Float → IO Float main :: IO () main = do mapM_ (print . sin . cos . (* (1.0 :: Double)) . fromIntegral) [1 .. 10000 :: Int] ta ← (2 ↑≣) -- ta :: Ptr Float (ta ≣← 0) 0.0 (ta ≣← 1) 0.0 t ← etime_ ta putStrLn $ " user time: " ++ show (ta ⥱ 0) putStrLn $ " system time: " ++ show (ta ⥱ 1) putStrLn $ " process time: " ++ show t (ta ≣⊠) -- optional in this case </code></pre>
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    1. POPass Pointer to an Array in Haskell to a C Function
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    1. COdo you like operators this much? I think the code would be more newbie-friendly with the standard function names..
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    2. COI'm think I'm quite odd and weird o__O. I love them so~~~ much!! And because my Haskell code is mainly for myself, I use them liberally *^o^*!! If I ever happen to collaborate with others on a joint project though, I'll definitely make sure to keep things friendly and maintainable and will avoid introducing so many indirections.
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