[previous] 1481 [next] Object of enum type is being modified with an increment or decrement operator.
Arithmetic type - Enum types REFERENCE - ISO:C90-6.5.2.2 Enumeration Specifiers

The value of an enum object is being modified using an increment or decrement operator (++ or --). This is permitted in the C language but it is dangerous because it could result in the object containing a value which is not a valid member of the enumeration.

For example: 


/*PRQA S 2017,2211,2213,3120,3227,3408,3447,3448,3602,4130 ++*/

typedef enum { RED = 2, GREEN = 4, BLUE = 6 } COLOUR;

extern COLOUR col;

extern void foo(void)
{
    ++col;                      /* Message 1481 and 1319 */
    --col;                      /* Message 1481 and 1319 */

    return;
}

QA·C Source Code Analyser 8.1.2
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