Synopsis

(Required) Operands shall not be of an inappropriate essential type. The right-hand operand of a shift operator is not of essentially unsigned type, meaning that undefined behavior might result from a negative shift.

Enabled by default

Yes

Severity/Certainty

Medium/Medium

Full description

The right-hand operand of a shift operator is not of essentially unsigned type.

Coding standards

Code examples

The following code example fails the check and will give a warning:

void example(void) {
  int a;
  unsigned int b;
  b << a;
}

The following code example passes the check and will not give a warning about this issue:

void example(void) {
  unsigned int a;
  unsigned int b;
  b << a;
}