The macro was an ugly hack I did mostly due to being upset about the Javaisms of this Kata. I realize now it could have been done better by forwarding the call to my function in a Carboat class, or importing my function to a Carboat namespace.

Also, you don't actually need using namespace std; to pass.

When I submitted this solution it would come back with compile error if I didn't include that line. The hidden full test suite needed it. The "quick check" tests already included it, so it wasn't that.