c++虚继承

#include <iostream>

using std::cin;
using std::cout;
using std::endl;

class Base{
public:
    Base(int a):m(a){}
private:
    int m;
    int m1;
};

class sub1: public virtual Base
{
public:
    sub1(int a): Base(a) {}
};

class sub2: public virtual Base
{
public:
    sub2(int a): Base(a) {}
};

class Drive: public sub1, public sub2
{
public:
    Drive(int a): Base(a), sub1(a), sub2(a) {}
};

int main(void)
{
    Drive a(2);
    cout<< sizeof(a) <<endl;

    system("PAUSE");
    return 0;
}

Base 即为虚基类

通过虚继承可以解决代码冗余重复问题

虚继承会增加一个标记位