diff --git a/src/helpers.hpp b/src/helpers.hpp
--- a/src/helpers.hpp
+++ b/src/helpers.hpp
@@ -70,13 +70,6 @@ template <typename T> static inline T de
 	FORCEINLINE mask_t& operator ^= (mask_t& m1, mask_t m2) {m1 = m1 ^ m2; return m1;} \
 	FORCEINLINE mask_t operator ~(mask_t m) {return (mask_t)(~(int)m);}
 
-/** probably redundant enum combining operators (as we have conversion functions)
- *  but the old code is full of such arithmetics */
-# define DECLARE_ENUM_AS_BIT_INDEX(idx_t, mask_t) \
-	FORCEINLINE mask_t operator << (int m, idx_t i) {return (mask_t)(m << (int)i);} \
-	FORCEINLINE mask_t operator << (mask_t m, int i) {return (mask_t)(((int)m) << i);} \
-	FORCEINLINE mask_t operator >> (mask_t m, int i) {return (mask_t)(((int)m) >> i);}
-
 
 /** Informative template class exposing basic enumeration properties used by several
  *  other templates below. Here we have only forward declaration. For each enum type