C++中回调函数及函数指针的实例详解

//A类与B类的定义class A{public:  void Test()  {    cout << "A::Test()" << endl;  }};class B : public A{public:  void Test()  {    cout << "B::Test()" << endl;  }};//定义类的成员函数指针typedef void (A::*A_mFun)(void);typedef void (B::*B_mFun)(void);int main(){  //Code  A a;  B b;  A_mFun pAFun = &(A::Test); //Note:Test成员函数必须为public,否则会报错  B_mFun pBFun = &(B::Test); //Note:Test成员函数必须为public,否则会报错  (a.*pAFun)();        //输出A::Test()  (b.*pBFun)();        //输出B::Test()  (b.*pAFun)();        //输出A::Test()  A* pA = &a;  B* pB = &b;  (pA->*pAFun)();       //输出A::Test()  (pB->*pBFun)();       //输出B::Test()  (pB->*pAFun)();       //输出A::Test(),B*变量可赋值给A*变量  return 0;}