3 files changed, 55 insertions, 25 deletions

diff --git a/lib/Data/Packed/Internal/Common.hs b/lib/Data/Packed/Internal/Common.hs
index 2b3ec28..c3a733c 100644
--- a/lib/Data/Packed/Internal/Common.hs
+++ b/lib/Data/Packed/Internal/Common.hs
@@ -60,6 +60,11 @@ common f = commonval . map f where
 infixl 0 //
 (//) = flip ($)
 
+-- hmm..
+ww2 w1 o1 w2 o2 f = w1 o1 $ \a1 -> w2 o2 $ \a2 -> f a1 a2
+ww3 w1 o1 w2 o2 w3 o3 f = w1 o1 $ \a1 -> ww2 w2 o2 w3 o3 (f a1)
+ww4 w1 o1 w2 o2 w3 o3 w4 o4 f = w1 o1 $ \a1 -> ww3 w2 o2 w3 o3 w4 o4 (f a1)
+
 -- GSL error codes are <= 1024
 -- | error codes for the auxiliary functions required by the wrappers
 errorCode :: Int -> String
diff --git a/lib/Data/Packed/Internal/Matrix.hs b/lib/Data/Packed/Internal/Matrix.hs
index 5617996..90a96b5 100644
--- a/lib/Data/Packed/Internal/Matrix.hs
+++ b/lib/Data/Packed/Internal/Matrix.hs
@@ -79,9 +79,20 @@ cmat MF {rows = r, cols = c, fdat = d } = MC {rows = r, cols = c, cdat = transda
 fmat m@MF{} = m
 fmat MC {rows = r, cols = c, cdat = d } = MF {rows = r, cols = c, fdat = transdata c d r}
 
-matc m f = f (rows m) (cols m) (ptr (cdat m))
-matf m f = f (rows m) (cols m) (ptr (fdat m))
+--matc m f = f (rows m) (cols m) (ptr (cdat m))
+--matf m f = f (rows m) (cols m) (ptr (fdat m))
 
+withMatrix MC {rows = r, cols = c, cdat = d } f =
+    withForeignPtr (fptr d) $ \p -> do
+        let m f = do
+            f r c p
+        f m
+
+withMatrix MF {rows = r, cols = c, fdat = d } f =
+    withForeignPtr (fptr d) $ \p -> do
+        let m f = do
+            f r c p
+        f m
 
 {- | Creates a vector by concatenation of rows
 
@@ -236,7 +247,9 @@ transdataAux fun c1 d c2 =
         then d
         else unsafePerformIO $ do
             v <- createVector (dim d)
-            fun r1 c1 (ptr d) r2 c2 (ptr v) // check "transdataAux" [d,v]
+            withForeignPtr (fptr d) $ \pd ->
+                withForeignPtr (fptr v) $ \pv ->
+                    fun r1 c1 pd r2 c2 pv // check "transdataAux"
             -- putStrLn $ "---> transdataAux" ++ show (toList d) ++ show (toList v)
             return v
   where r1 = dim d `div` c1
@@ -250,8 +263,8 @@ foreign import ccall safe "auxi.h transC"
 
 ------------------------------------------------------------------
 
-gmatC MF {rows = r, cols = c, fdat = d} f = f 1 c r (ptr d)
-gmatC MC {rows = r, cols = c, cdat = d} f = f 0 r c (ptr d)
+gmatC MF {rows = r, cols = c, fdat = d} p f = f 1 c r p
+gmatC MC {rows = r, cols = c, cdat = d} p f = f 0 r c p
 
 dtt MC { cdat = d } = d
 dtt MF { fdat = d } = d
@@ -260,7 +273,9 @@ multiplyAux fun a b = unsafePerformIO $ do
     when (cols a /= rows b) $ error $ "inconsistent dimensions in contraction "++
                                       show (rows a,cols a) ++ " x " ++ show (rows b, cols b)
     r <- createMatrix RowMajor (rows a) (cols b)
-    fun // gmatC a // gmatC b // matc r // check "multiplyAux" [dtt a, dtt b, cdat r]
+    withForeignPtr (fptr (dtt a)) $ \pa -> withForeignPtr (fptr (dtt b)) $ \pb ->
+        withMatrix r $ \r ->
+            fun // gmatC a pa // gmatC b pb // r // check "multiplyAux"
     return r
 
 multiplyR = multiplyAux cmultiplyR
@@ -293,7 +308,8 @@ subMatrixR :: (Int,Int) -> (Int,Int) -> Matrix Double -> Matrix Double
 subMatrixR (r0,c0) (rt,ct) x' = unsafePerformIO $ do
     r <- createMatrix RowMajor rt ct
     let x = cmat x'
-    c_submatrixR r0 (r0+rt-1) c0 (c0+ct-1) // matc x // matc r // check "subMatrixR" [cdat x]
+    ww2 withMatrix x withMatrix r $ \x r ->
+        c_submatrixR r0 (r0+rt-1) c0 (c0+ct-1) // x // r // check "subMatrixR"
     return r
 foreign import ccall "auxi.h submatrixR" c_submatrixR :: Int -> Int -> Int -> Int -> TMM
 
@@ -317,8 +333,9 @@ subMatrix = subMatrixD
 
 diagAux fun msg (v@V {dim = n}) = unsafePerformIO $ do
     m <- createMatrix RowMajor n n
-    fun // vec v // matc m // check msg [v]
-    return m -- {tdat = dat m}
+    ww2 withVector v withMatrix m $ \v m ->
+        fun // v // m // check msg
+    return m
 
 -- | diagonal matrix from a real vector
 diagR :: Vector Double -> Matrix Double
@@ -339,7 +356,8 @@ diag = diagD
 constantAux fun x n = unsafePerformIO $ do
     v <- createVector n
     px <- newArray [x]
-    fun px // vec v // check "constantAux" []
+    withVector v $ \v ->
+        fun px // v // check "constantAux"
     free px
     return v
 
@@ -385,7 +403,8 @@ fromFile :: FilePath -> (Int,Int) -> IO (Matrix Double)
 fromFile filename (r,c) = do
     charname <- newCString filename
     res <- createMatrix RowMajor r c
-    c_gslReadMatrix charname // matc res // check "gslReadMatrix" []
+    withMatrix res $ \res ->
+        c_gslReadMatrix charname // res // check "gslReadMatrix"
     --free charname  -- TO DO: free the auxiliary CString
     return res
 foreign import ccall "auxi.h matrix_fscanf" c_gslReadMatrix:: Ptr CChar -> TM
diff --git a/lib/Data/Packed/Internal/Vector.hs b/lib/Data/Packed/Internal/Vector.hs
index dc86484..386ebb5 100644
--- a/lib/Data/Packed/Internal/Vector.hs
+++ b/lib/Data/Packed/Internal/Vector.hs
@@ -31,11 +31,11 @@ data Vector t = V { dim  :: Int              -- ^ number of elements
                   , fptr :: ForeignPtr t     -- ^ foreign pointer to the memory block
                   }
 
-ptr (V _ fptr) = unsafeForeignPtrToPtr fptr
+--ptr (V _ fptr) = unsafeForeignPtrToPtr fptr
 
--- | check the error code and touch foreign ptr of vector arguments (if any)
-check :: String -> [Vector a] -> IO Int -> IO ()
-check msg ls f = do
+-- | check the error code
+check :: String -> IO Int -> IO ()
+check msg f = do
     err <- f
     when (err/=0) $ if err > 1024
                       then (error (msg++": "++errorCode err)) -- our errors
@@ -43,7 +43,6 @@ check msg ls f = do
                         ps <- gsl_strerror err
                         s <- peekCString ps
                         error (msg++": "++s)
-    mapM_ (touchForeignPtr . fptr) ls
     return ()
 
 -- | description of GSL error codes
@@ -55,9 +54,14 @@ type Vc t s = Int -> Ptr t -> s
 -- infixr 5 :>
 -- type t :> s = Vc t s
 
--- | adaptation of our vectors to be admitted by foreign functions: @f \/\/ vec v@
-vec :: Vector t -> (Vc t s) -> s
-vec v f = f (dim v) (ptr v)
+--- | adaptation of our vectors to be admitted by foreign functions: @f \/\/ vec v@
+--vec :: Vector t -> (Vc t s) -> s
+--vec v f = f (dim v) (ptr v)
+
+withVector (V n fp) f = withForeignPtr fp $ \p -> do
+    let v f = do
+        f n p
+    f v
 
 -- | allocates memory for a new vector
 createVector :: Storable a => Int -> IO (Vector a)
@@ -76,7 +80,8 @@ fromList :: Storable a => [a] -> Vector a
 fromList l = unsafePerformIO $ do
     v <- createVector (length l)
     let f _ p = pokeArray p l >> return 0
-    f // vec v // check "fromList" []
+    withVector v $ \v ->
+        f // v // check "fromList"
     return v
 
 safeRead v = unsafePerformIO . withForeignPtr (fptr v)
@@ -118,8 +123,9 @@ subVector k l (v@V {dim=n})
     | k<0 || k >= n || k+l > n || l < 0 = error "subVector out of range"
     | otherwise = unsafePerformIO $ do
         r <- createVector l
-        let f = copyArray (ptr r) (advancePtr (ptr v) k) l >> return 0
-        f // check "subVector" [v,r]
+        let f _ s _ d = copyArray d (advancePtr s k) l >> return 0
+        ww2 withVector v withVector r $ \v r ->
+            f // v // r // check "subVector"
         return r
 
 {- | Reads a vector position:
@@ -144,12 +150,12 @@ join [] = error "joining zero vectors"
 join as = unsafePerformIO $ do
     let tot = sum (map dim as)
     r@V {fptr = p} <- createVector tot
-    withForeignPtr p $ \_ ->
-        joiner as tot (ptr r)
+    withForeignPtr p $ \ptr ->
+        joiner as tot ptr
     return r
   where joiner [] _ _ = return ()
         joiner (r@V {dim = n, fptr = b} : cs) _ p = do
-            withForeignPtr b  $ \_ -> copyArray p (ptr r) n
+            withForeignPtr b $ \pb -> copyArray p pb n
             joiner cs 0 (advancePtr p n)