Increment, Decrement

stepmania/src/RageUtil.h

@@ -266,6 +266,12 @@ int FindIndex( T1 begin, T1 end, const T2 *p )
 	return iter - begin;
 }
 
+/* Useful for objects with no operator-, eg. map::iterator (more convenient than advance). */
+template<class T>
+T Increment( T a ) { ++a; return a; }
+template<class T>
+T Decrement( T a ) { --a; return a; }
+
 void TrimLeft(CString &str, const char *s = "\r\n\t ");
 void TrimRight(CString &str, const char *s = "\r\n\t ");
 void StripCrnl(CString &s);