QA·C Help - 3131

	3131	Hard coded 'magic' number, '%s', used to define the size of a bit-field.

Constants

An integer constant has been used to define the size of a bit-field.

If the size of the bit-field is also used in other contexts it may be better to define the constant as a macro or an enum constant. Message 3131 will not be generated in these contexts and the macro or enum constant can be reused wherever needed. Giving the constant a name may also improve readability.

Notice also that message 3131 will not be generated on a bit-field defined with a width of "1".

For example:


/*PRQA S 553,2017,2213,3602,3621 ++*/

#define NBITS 3
enum {FOUR = 4};

struct ST
{
    unsigned int  a:1;            /* OK           */
    unsigned int  b:2;            /* Message 3131 */
    unsigned int  c:NBITS;        /* OK           */
    unsigned int  d:FOUR;         /* OK           */
};

No MISRA C:2012 Rules applicable to message 3131

See also:

3120 Hard-coded 'magic' integer constant, '%s'.
3121 Hard-coded 'magic' floating constant, '%s'.
3122 Hard-coded 'magic' string literal, %s.
3123 Hard coded 'magic' character constant, %s.
3132 Hard coded 'magic' number, '%s', used to define the size of an array.

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MISRA C:2012 Compliance Module 1.0
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