C++面向对象模型(虚表与虚表指针)

class VirtualSize

{

    virtual void function_name() {}

    int data;

} v;

    ///虚函数指针

    ///cout << sizeof(v) << endl;  ///在存在virtual函数的时候多四个字节

class A {

public:

    virtual void vfun1() { cout << "A vfun1" << endl; }

    virtual void vfun2() { cout << "A vfun2" << endl; }

            void fun1() { cout << "A fun1" << endl; }

            void fun2() { cout << "A fun2" << endl; }

private:

    int data1, data2;

};

class B: public A{

public:

    virtual void vfun1() { cout << "B vfun1" << endl; }

            void func2() { cout << "B fun2" << endl; }

private:

    int data3;

};

class C: public B {

public:

    virtual void vfun1()  { cout << "C vfun1" << endl; }

            void fun2() { cout << "C fun2" << endl; }

private:

    int data1, data4;

};