#include <iostream>
using namespace std;
class A
{
public:
    A(int ii = 0) : i(ii) {}
    A(int ii, int ss) : i(ii + ss) {}
    void show() { cout << "i = " << i << endl; }
    ~A() { cout << "Out A" << i << endl; }
    A magic(int ss){
        this->i = ss * this->i;
        return *this;
    }

private:
    int i;
};
int main()
{
    A a(10, 5), s(10);
    a = s.magic(20).magic(10);
}