1400			Enum object is being compared with an enum constant of a different enum type using an equality operator.
	Arithmetic type - Enum types				REFERENCE - ISO:C90-6.5.2.2 Enumeration Specifiers

/*PRQA S 1-9999 ++*/
/*PRQA S 1400, 1317 --*/

enum SIZE   { SMALL = 1, MEDIUM = 2, LARGE = 3 };
enum COLOUR { RED = 2, GREEN = 4, BLUE = 6 };

extern void foo(enum SIZE box)
{
   if (box == RED  ) { }        /* Message 1400        */
   if (box != GREEN) { }        /* Message 1400 + 1317 */

   return;
}

See also:

• 1317 Value of constant expression is not in the enum type to which it is being converted.
• 1404 Enum object is being compared with an enum constant of a different enum type using a relational operator.
• 1475 Range of possible enum values suggests this test is always true.