MISRA Discussion Forums

I have a violation of MISRA 2004 Advisory Rule 19.7, Function-like macro defined: 'CONV'

#define F_MIN (-0.5)
#define F_MAX (0.5)
#define CONV(x) ((int32_t) ((x) < F_MAX ? ((x) >= F_MIN ? (x)*0x80000000U : 0xFFFF8000U) : 0x7fff0000U))

int32_t myVariable = CONV(0.25); /* the preprocessor replace macro with the value 0x20000000 */

How I declare the macro CONV(), which is not a function but really a preprocessor task, to be compliant to MISRA ?

BR,

Pat

Rule 19.7 is only intended to apply in situations where a function call would be permitted.

As an example, a function call is not permitted in a constant-expression. Therefore Rule 19.7 does not apply to the initialisers for objects that have static storage duration, e.g.