#include <iostream> #include <string> using namespace std; class Car { public: string brand; mutable int counter; Car(string x) { brand = x; counter = 0; } void printBrand() const { counter++; // OK, because counter is mutable cout << brand << "\n"; } }; int main() { const Car myCar("Volvo"); myCar.printBrand(); myCar.printBrand(); cout << myCar.counter; return 0; }