C++虛函數、賦值相容原則

標籤：

 1 #include <iostream.h> 2  3 class A 4 { 5 public: 6     void f1() 7     { cout << "a" << endl; } 8     virtual void f2() 9     { cout << "b" << endl; }10 };11 12 class B : public A13 {14 public:15     void f1()16     { cout << "c" << endl; }17     virtual void f2()18     { cout << "d" << endl; }19 };20 21 void main()22 {23     A a;24     B b;25     a.f1();26     a.f2();27     b.f1();28     cout << "--------------------" << endl;29 30     A *pa = &b;31     pa->f1();//a32     pa->f2();//d33     cout << "-------------------" << endl;34 35     A *fa = (A *)&b;36     fa->f1();//a37     fa->f2();//d38     cout << "-------------------" << endl;39 }

 

C++虛函數、賦值相容原則