如何确保在C ++中的派生类中覆盖（隐藏）方法？

class Base {

    public:
         void foo() const {
             std::cout << "foo const" << std::endl;
         }

};


class Derived : public Base {

  public:
         void foo()  {
             std::cout << "foo"<< std::endl;
         }


 }
class Base {

    public:
         void foo() c