Fix: Replace int with std::underlying_type in DECLARE_ENUM_AS_BIT_SET.

This fixes 64 bit uses of this macro.

src/core/enum_type.hpp

@@ -31,13 +31,13 @@
 
 /** Operators to allow to work with enum as with type safe bit set in C++ */
 # define DECLARE_ENUM_AS_BIT_SET(mask_t) \
-	inline mask_t operator | (mask_t m1, mask_t m2) {return (mask_t)((int)m1 | m2);} \
-	inline mask_t operator & (mask_t m1, mask_t m2) {return (mask_t)((int)m1 & m2);} \
-	inline mask_t operator ^ (mask_t m1, mask_t m2) {return (mask_t)((int)m1 ^ m2);} \
+	inline mask_t operator | (mask_t m1, mask_t m2) {return (mask_t)((std::underlying_type<mask_t>::type)m1 | m2);} \
+	inline mask_t operator & (mask_t m1, mask_t m2) {return (mask_t)((std::underlying_type<mask_t>::type)m1 & m2);} \
+	inline mask_t operator ^ (mask_t m1, mask_t m2) {return (mask_t)((std::underlying_type<mask_t>::type)m1 ^ m2);} \
 	inline mask_t& operator |= (mask_t& m1, mask_t m2) {m1 = m1 | m2; return m1;} \
 	inline mask_t& operator &= (mask_t& m1, mask_t m2) {m1 = m1 & m2; return m1;} \
 	inline mask_t& operator ^= (mask_t& m1, mask_t m2) {m1 = m1 ^ m2; return m1;} \
-	inline mask_t operator ~(mask_t m) {return (mask_t)(~(int)m);}
+	inline mask_t operator ~(mask_t m) {return (mask_t)(~(std::underlying_type<mask_t>::type)m);}
 
 
 /**