For GHC, implement the Typeable.hs macros using standalone deriving

[ghc-base.git] / Foreign / Ptr.hs

diff --git a/Foreign/Ptr.hs b/Foreign/Ptr.hs
index 564bb1c..26dda5c 100644 (file)
--- a/Foreign/Ptr.hs
+++ b/Foreign/Ptr.hs
@@ -1,4 +1,13 @@
-{-# OPTIONS_GHC -XNoImplicitPrelude #-}
+{-# LANGUAGE CPP
+           , NoImplicitPrelude
+           , ForeignFunctionInterface
+           , MagicHash
+           , GeneralizedNewtypeDeriving
+  #-}
+#ifdef __GLASGOW_HASKELL__
+{-# LANGUAGE DeriveDataTypeable, StandaloneDeriving #-}
+#endif
+
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Foreign.Ptr
@@ -58,7 +67,7 @@ import GHC.Show
 import GHC.Enum
 import GHC.Word         ( Word(..) )
 
-import Data.Int
+-- import Data.Int
 import Data.Word
 #else
 import Control.Monad    ( liftM )
@@ -105,12 +114,14 @@ foreign import ccall unsafe "freeHaskellFunctionPtr"
 
 # ifdef __GLASGOW_HASKELL__
 -- | An unsigned integral type that can be losslessly converted to and from
--- @Ptr@.
+-- @Ptr@. This type is also compatible with the C99 type @uintptr_t@, and
+-- can be marshalled to and from that type safely.
 INTEGRAL_TYPE(WordPtr,tyConWordPtr,"WordPtr",Word)
         -- Word and Int are guaranteed pointer-sized in GHC
 
 -- | A signed integral type that can be losslessly converted to and from
--- @Ptr@.
+-- @Ptr@.  This type is also compatible with the C99 type @intptr_t@, and
+-- can be marshalled to and from that type safely.
 INTEGRAL_TYPE(IntPtr,tyConIntPtr,"IntPtr",Int)
         -- Word and Int are guaranteed pointer-sized in GHC