#ifndef SAFE_INT_H
#define SAFE_INT

// a class that behaves like an int but will throw an exception when
// dividing by zero, or overflow/underflow beyond the limits of int
class safe_int
{
	private:
		int value;
		void add_pos(int i);
		void add_neg(int i);
		int sign(int i) const;
	
	public:
		safe_int(int v);
		operator int() const;
		
		safe_int operator+();
		safe_int operator-();
		
		safe_int& operator+=(const safe_int& i);
		safe_int& operator-=(const safe_int& i);
		safe_int& operator*=(const safe_int& i);
		safe_int& operator/=(const safe_int& i);
		
		safe_int operator+(const safe_int& i) const;
		safe_int operator-(const safe_int& i) const;
		safe_int operator*(const safe_int& i) const;
		safe_int operator/(const safe_int& i) const;
		
		class divide_by_zero { };
		class overflow { };
		class underflow { };
};

#endif