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

//All fatal exceptions must be derived from this abstract class.

class fatal {
	virtual void print(ostream&) const = 0;
public:
	virtual ~fatal() {}

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