MISRA C:2012  Rule-13.3:  (Advisory)			A full expression containing an increment (++) or decrement (--) operator should have no other potential side effects other than that caused by the increment or decrement operator

Amplification:

A function call is considered to be a side effect for the purposes of this rule.

All sub-expressions of the full expression are treated as if they were evaluated for the purposes of this rule, even if specified as not being evaluated by The Standard.

Example Code:

#pragma PRQA_MESSAGES_OFF 2982,2983,2984

#include "misra.h"
#include "m3cmex.h"

struct XS
{
    int16_t a;
    int16_t b;
};


extern int16_t rule_1303( void )
{
   int16_t x = 0;
   int16_t r;
   int16_t buf[10] = {0};
   int16_t *psi;
   struct XS xsa = {0};
   struct XS *ps;

   ++x;
   x++;
   --x;
   x--;

   r = ++x;                    /* 3440 */
   r = x++;                    /* 3440 */
   r = --x;                    /* 3440 */
   r = x--;                    /* 3440 */

   buf[0]++;
   xsa.a++;
   ps = &xsa;
   ps->a++;
   psi = &buf[5];
   (*psi)++;

   return r;
}

QAC messages that encompass this guideline:

3440	Using the value resulting from a ++ or -- operation.

(c) The Motor Industry Research Association, 2012

QA C Source Code Analyser 8.1.2 MISRA C:2012 Compliance Module 1.0 © 2013 Programming Research www.programmingresearch.com

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