MISRA.VAR.NEEDS.CONST

Variable is not modified but is declared without const qualifier.

MISRA-C++ Rule 7—1—1 (required): A variable which is not modified shall be const qualified.

Rationale

If a variable does not need to be modified, then it shall be declared with const qualification so that it cannot be modified. A non-parametric variable will then require its initialization at the point of declaration. Also, future maintenance cannot accidentally modify the value.

Example

void b ( int32_t * );
int32_t f ( int32_t * p1,  // Non-compliant
      int32_t * const p2,  // Compliant
      int32_t * const p3 ) // Compliant
{
   *p1 = 10;
   *p2 = 10;
   b( p3 );
   int32_t i = 0;          // Non-compliant
   return i;
}