more generic type-punning helper

stepmania/src/EnumHelper.h

@@ -9,44 +9,6 @@ extern "C"
 #include "lua-5.1/src/lua.h"
 }
 
-/*
- * Safely add an integer to an enum.
- *
- * This is illegal:
- *
- *  ((int&)val) += iAmt;
- *
- * It breaks aliasing rules; the compiler is allowed to assume that "val" doesn't
- * change (unless it's declared volatile), and in some cases, you'll end up getting
- * old values for "val" following the add.  (What's probably really happening is
- * that the memory location is being added to, but the value is stored in a register,
- * and breaking aliasing rules means the compiler doesn't know that the register
- * value is invalid.)
- *
- * Always do these conversions through a union.
- */
-template<typename T>
-static inline void enum_add( T &val, int iAmt )
-{
-	union conv
-	{
-		T value;
-		int i;
-	};
-
-	conv c;
-	c.value = val;
-	c.i += iAmt;
-	val = c.value;
-}
-
-template<typename T>
-static inline T enum_add2( T val, int iAmt )
-{
-	enum_add( val, iAmt );
-	return val;
-}
-
 #define FOREACH_ENUM_N( e, max, var )	for( e var=(e)0; var<max; enum_add<e>( var, +1 ) )
 #define FOREACH_ENUM( e, var )	for( e var=(e)0; var<NUM_##e; enum_add<e>( var, +1 ) )
 #define FOREACH_ENUM2 FOREACH_ENUM