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V3518. AUTOSAR. A switch-expression sho…
Analyzer diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
AUTOSAR errors
OWASP errors (C#)
Additional information
Contents

V3518. AUTOSAR. A switch-expression should not have Boolean type. Consider using of 'if-else' construct.

Mar 03 2021

This diagnostic rule is based on the software development guidelines developed by AUTOSAR (AUTomotive Open System ARchitecture).

A Boolean value can be cast to an integer and, therefore, can be used as a control variable in a 'switch' statement. However, it is preferable to use an 'if-else' construct in such cases as it conveys the developer's intentions in a clearer and more explicit way.

Original code:

int foo(unsigned a, unsigned b)
{
  while (a != 0 && b != 0)
  {
    switch (a > b) // <=
    {
    case 0:
      a -= b;
      break;
    default:
      b -= a;
      break;
    }
  }
  return a;
}

Better version:

int foo(unsigned a, unsigned b)
{
  while (a != 0 && b != 0)
  {
    if (a > b)
    {
      b -= a;
    }
    else
    {
      a -= b;
    }
  }
  return a;
}

This diagnostic is classified as:

  • AUTOSAR-M6.4.7
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