c++虚函数与重载

 class base{
 public:
     virtual void f(int n){ cout << "base"<<endl; }
 };
 class Derived :public base{
 public:
     void f(int n){ cout << "override" << endl; }
     void f(double d)
     {
         cout << "overload" << endl;;
     }
 };
 int main()
 {
     Derived de;
     base *b = &de;
     b->f();
     b->f(2.0);
     Derived *d = &de;
     d->f(2.0);
     d->f();
 }

输出为：override 　　override 　　overload 　　override

如果子类没有重写基类的虚函数，输出为　　base 　　base　　overload 　　overload

常见Java面试题 – 第三部分：重载（overloading）与重写（overriding）