QA·C Help - 1410

	1410	Enum object is being compared with a constant, non-enum expression using an equality operator.

Arithmetic type - Enum types		REFERENCE - ISO:C90-6.5.2.2 Enumeration Specifiers

An enum object is being compared with the value of a constant expression using an equality operator. If the value of the constant expression is the same as one of the enum constants, wouldn't it be better to use the symbolic enum constant instead ? If it isn't, the operation is redundant and is probably a mistake.

For example:


/*PRQA S 1-9999 ++*/
/*PRQA S 1410, 1317, 1414, 1475, 1476 --*/

enum SIZE   { SMALL = 2, MEDIUM = 4, LARGE = 6 };

extern void foo(enum SIZE box)
{
   if (box == LARGE ) { }       /*                     */
   if (box == 4  ) { }          /* Message 1410        */
   if (box != (2 + 3) ) { }     /* Message 1410 + 1317 */


   if (box <= MEDIUM ) { }      /*                     */
   if (box >  2  ) { }          /* Message 1414        */
   if (box < (4 + 3) ) { }      /* Message 1414 + 1475 */
   if (box <  2  ) { }          /* Message 1414 + 1476 */
}

No MISRA C:2012 Rules applicable to message 1410

See also:

1317 Value of constant expression is not in the enum type to which it is being converted.
1414 Enum object is being compared with a constant, non-enum expression using a relational operator.
1475 Range of possible enum values suggests this test is always true.
1476 Range of possible enum values suggests this test is always false.

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