QA C Help - Rule 19.7

		MISRA-C:2004 Rule 19.7: (Advisory)			A function should be used in preference to a function-like macro.

While macros can provide a speed advantage over functions, functions provide a safer and more robust mechanism. This is particularly true with respect to the type checking of parameters, and the problem of function-like macros potentially evaluating parameters multiple times.

Example Code:


#include "misra.h"
#include "m2cmex.h"

#define  MAX( A, B )   ( ( ( A ) > ( B ) ) ? ( A ) : ( B ) )    /* MISRA Violation */
#define  MMAX          ( 14 + 32 )
#define  HELLO         10

extern S16 test_1907( void )
{
   return 1;
}

QAC messages that encompass this guideline:

3453 A function could probably be used instead of this function-like macro.

(c) The Motor Industry Research Association, 2004

QA C Source Code Analyser 8.1.2
MISRA-C:2004 Compliance Module 3.2
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