#ifndef BASE_H
#define BASE_H
#include <iostream>
using namespace std;

class base {
	int i1;
public:
	base(int initial_i1): i1 {initial_i1} {}
	virtual ~base() {}

	virtual ostream& print(ostream& ost) const {return ost << i1;}

	friend ostream& operator<<(ostream& ost, const base& b) {
		return b.print(ost);
	}
};
#endif