#include <iostream>using namespace std;#include <string>//--------------------------------------class A{public:    int m_ax ;    int m_ay;    A();    A(int va,int vy);    void show();};A::A(){}A::A(int vx,int vy){    this->m_ax = vx;    this->m_ay = vy;}void A::show(){    cout<<"A::show "<<endl;    cout<<"A::m_ax = "<<m_ax<<endl;    cout<<"A::m_ay = "<<m_ay<<endl;}//--------------------------------------class B1: virtual public A {public:    int m_b1x;    B1();    B1(int ax,int ay,int bx);};B1::B1(){}B1::B1(int ax,int ay,int b1x){    m_ax = ax;    m_ay = ay;    m_b1x = b1x;}//---------------------------------------class B2: virtual public A {public:    int m_b2x;    B2();    B2(int ax,int ay,int b2x);};B2::B2(){}B2::B2(int ax,int ay,int b2x){    m_ax = ax;    m_ay = ay;    m_b2x = b2x;}//-------------------------------------class C: public B1,public B2 {//虚基继承public:    int m_cx;    C();    C(int ax,int ay,int b1x,int b2x);    void show();};C::C(){}C::C(int ax,int ay,int b1x,int b2x){    m_ax = ax;//因为C的上级B1、B2使用了虚基继承A，所以C类中只有一个m_ax，不会产生二义性。    m_ay = ay;    m_b1x = b1x;    m_b2x = b2x;}void C::show(){    cout<<"C::show()"<<endl;    cout<<"m_ax = "<<m_ax<<endl;    cout<<"m_ay = "<<m_ay<<endl;    cout<<"m_b1x = "<<m_b1x<<endl;    cout<<"m_b2x = "<<m_b2x<<endl;}//--------------------------------------int main(){    C c1(1 ,2 ,3 ,4 );    c1.show();    //C中实现的show    c1.A::show(); //从A继承下来的show只有一个，以下面这三种方式访问到的都是同一个A::show（）    c1.B1::show();    c1.B2::show();    cout<<"addr c1.B1::m_ax = "<<&(c1.B1::m_ax)<<endl;//从A继承下来的m_ax只有一个，这三种方式访问的是同一个m_ax,地址是相同的。    cout<<"addr c1.B2::m_ax = "<<&(c1.B2::m_ax)<<endl;    cout<<"addr c1.A::m_ax = "<<&(c1.A::m_ax)<<endl;    cout<<"c1.B1::m_ax = "<<c1.B1::m_ax<<endl;    cout<<"c1.B2::m_ax = "<<c1.B2::m_ax<<endl;    cout<<"c1.A::m_ax = "<<c1.A::m_ax<<endl;    B1 b1(22,33,44) ;    cout<<"B1.m_ax = "<<b1.m_ax<<endl;    b1.show();//B虚继承A ，可以不用重写A的方法而直接使用。    while(1);    return 0 ;}// C::show()// m_ax = 1// m_ay = 2// m_b1x = 3// m_b2x = 4// // A::show // A::m_ax = 1// A::m_ay = 2// // A::show // A::m_ax = 1// A::m_ay = 2// // A::show // A::m_ax = 1// A::m_ay = 2// // addr c1.B1::m_ax = 0xbfbb43c8  //因为C的上级B1、B2使用了虚基继承A，所以C类中只有一个m_ax，不会产生二义性。// addr c1.B2::m_ax = 0xbfbb43c8// addr c1.A::m_ax = 0xbfbb43c8// c1.B1::m_ax = 1// c1.B2::m_ax = 1// c1.A::m_ax = 1// // B1.m_ax = 22// A::show // A::m_ax = 22// A::m_ay = 33