Synopsis

Deprecated operation on bool.

Enabled by default

Yes

Severity/Certainty

Medium/High

Full description

An undefined increment or decrement operation is performed on a bool value. In older versions of C++, Boolean values were modeled by a typedef to an integer type, allowing increment and decrement operations. These types are deprecated in Standard C++ and the operations no longer apply to the built-in C++ bool type.

Coding standards

Code examples

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

int main(void)
{
  bool x = true;
  ++x;  //this operation is undefined for a bool
}

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

int main(void)
{
  int x = 0;
  ++x;  //OK - x is an int
}