私有继承：如何使基类的对象（具有纯虚方法）？

class Base
{
  protected:
  virtual void methodDefinedInBase() = 0;
}

Class Derived: private Base
{
  public:
  void someMethod();
  protected:
  virtual void methodDefinedInBase()
  {
    std::cout<<\"From B\"<<std::endl;
  }
}

Derived1 x;
Derived2 y;

// Somewhere inside Derived1:
Base & rb = x;

// Somewhere inside Derived2:
Base * pb = &y;

rb

pb

x

y