#include<iostream>
using namespace std;
/*args都是类类型*/
template<typename ...args>
class A : public args... {
    
     //或者class A :  args...
public:
    A()
    {
    
    
        printf("this = %p\n", this);
    }
};

class one {
    
    
public:
    one()
    {
    
    
        printf("this = %p\n", this);
    }
};

class two {
    
    
public:
    two()
    {
    
    
        printf("this = %p\n", this);
    }
};

class three {
    
    
public:
    three()
    {
    
    
        printf("this = %p\n", this);
    }
};

int main(int argc, char* argv[])
{
    
    
    A<one, two, three> obj;
    /*
    A<one, two, three>相当于
    class A<one ,two, three>:public one,public two,public three  
    */
    return 0;
}

在多重继承当中，我们都知道，子类对象的this和继承的第一个父类的this是一样的。在执行类模板A的实例化时依次执行one,two,three的构造函数进行初始化工作，最后执行A的构造函数。