#include <iostream>

class hoge {
   int _n;
public:
   hoge(int n) : _n(n) {}
   void set(const hoge& h) {
      _n = h._n; // h._n is a private member
   }
   int get() const {
      return _n;
   }
};

int main() {
   hoge h1(1), h2(2);
   h1.set(h2);
   std::cout << h1.get() << std::endl;
   return 0;
}

2