lazy, inline,
-- * Transform comprehensions
- Down(..), groupWith, sortWith, the
+ Down(..), groupWith, sortWith, the,
+
+ -- * Event logging
+ traceEvent
) where
import GHC.Prim
import GHC.Base
+import GHC.Magic
import GHC.Word
import GHC.Int
-import GHC.Num
-import GHC.Float
+-- import GHC.Float
import GHC.Ptr
import Data.String
import Data.List
+import Foreign.C
-- XXX This should really be in Data.Tuple, where the definitions are
maxTupleSize :: Int
groupWith f xs = build (\c n -> groupByFB c n (\x y -> f x == f y) (sortWith f xs))
groupByFB :: ([a] -> lst -> lst) -> lst -> (a -> a -> Bool) -> [a] -> lst
-groupByFB c n eq xs = groupByFBCore xs
+groupByFB c n eq xs0 = groupByFBCore xs0
where groupByFBCore [] = n
groupByFBCore (x:xs) = c (x:ys) (groupByFBCore zs)
where (ys, zs) = span (eq x) xs
+
+-- -----------------------------------------------------------------------------
+-- tracing
+
+traceEvent :: String -> IO ()
+traceEvent msg = do
+ withCString msg $ \(Ptr p) -> IO $ \s ->
+ case traceEvent# p s of s' -> (# s', () #)