QA·C Help - 1413

	1413	A constant expression of non-enum type is being returned from a function with an enum return type.

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

A constant expression is being used as the return expression of a function. The function is of enum type but the return expression is not. This is permitted in the C language but is it really intended ? It could result in an enum object containing a value which is not a valid member of the enumeration.

If the value of the constant expression does not coincide with one of the enumeration constants in the enum type, an additional message will be generated.

Message 1461 is generated if the value happens to correspond to the bitwise inclusive OR (|) of some of the enumeration constants
In all other cases message 1317 is generated.

For example:


/*PRQA S 1277,2006,2017,2201,2203,3120,3198,3227,3408,3447,3448,3602 ++*/

typedef enum tree
{
    fir   = 0x0001,
    cedar = 0x0002,
    maple = 0x0004,
    pine  = 0x0008 } TREE;

extern void func1(TREE trp);
extern TREE   tra;

extern TREE foo(int m)
{
   if (m < 0)
   {
       func1(0x0002);                /* Message 1411          */
       tra = 0x0002;                 /* Message 1412          */
       return(0x0002);               /* Message 1413          */
   }
   else if (m > 0)
   {
       func1(0x00FF);                /* Message 1411 and 1317 */
       tra = 0x00FF;                 /* Message 1412 and 1317 */
       return(0x00FF);               /* Message 1413 and 1317 */
   }
   else
   {
       func1(0x0003);                /* Message 1411 and 1461 */
       tra = 0x0003;                 /* Message 1412 and 1461 */
       return (0x0003);              /* Message 1413 and 1461 */
   }
}

See also:

1317 Value of constant expression is not in the enum type to which it is being converted.
1412 A constant expression of non-enum type is being assigned to an object of enum type.
1461 Value of constant expression is not in the enum type to which it is being converted, but is bitwise OR of constants in the enum type.

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