portable implementation of WordPtr/IntPtr for non-GHC

[haskell-directory.git] / include / Typeable.h

diff --git a/include/Typeable.h b/include/Typeable.h
index ea3fda7..b4ea475 100644 (file)
--- a/include/Typeable.h
+++ b/include/Typeable.h
@@ -10,6 +10,9 @@
  *     instance (Typeable a1, ..., Typeable an) => Typeable (tc a1 ... an)
  * -------------------------------------------------------------------------- */
 
+#ifndef TYPEABLE_H
+#define TYPEABLE_H
+
 #define INSTANCE_TYPEABLE0(tycon,tcname,str) \
 tcname = mkTyCon str; \
 instance Typeable tycon where { typeOf _ = mkTyConApp tcname [] }
@@ -57,3 +60,5 @@ instance (Typeable a, Typeable b, Typeable c) => Typeable (tycon a b c) where {
   typeOf = typeOfDefault }
 
 #endif /* !__GLASGOW_HASKELL__ */
+
+#endif