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

class date {
	static const int length[];

	int year;    //must construct data members in this order
	int month;   //date::january to date::december inclusive
	int day;     //1 to length[month] inclusive

public:
	enum month_t {   //indices into the length array
		january = 1,
		february,
		march,
		april,
		may,
		june,
		july,
		august,
		september,
		october,
		november,
		december
	};

	//Exceptions thrown by the constructor of class date:

	class bad_month {
		const int month;
	public:
		bad_month(int initial_month): month(initial_month) {}
		virtual ~bad_month() {}
		virtual void print(ostream& ost) const {ost << "bad month " << month;}
	};

	class bad_month_and_day: public bad_month {
		const int day;

		void print(ostream& ost) const {
			bad_month::print(ost);
			ost << ", day " << day;
		}
	public:
		bad_month_and_day(int initial_month, int initial_day)
			: bad_month(initial_month), day(initial_day) {}
	};

	//Exceptions thrown by the 'crement operators functions of class date:

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

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

	class overflow: public flow {
		void print(ostream& ost) const {
			ost << "can't go beyond December 31, " << INT_MAX;
		}
	};

	class underflow: public flow {
		void print(ostream& ost) const {
			ost << "can't go before January 1, " << INT_MIN;
		}
	};

	date(int initial_month, int initial_day, int initial_year) throw (bad_month);

	date& operator++() throw (overflow);
	date& operator--() throw (underflow);

	const date operator++(int) throw (overflow) {
		const date old = *this;
		++*this;
		return old;
	}

	const date operator--(int) throw (underflow) {
		const date old = *this;
		--*this;
		return old;
	}

	friend ostream& operator<<(ostream& ost, const date& d) {
		return ost << d.month << "/" << d.day << "/" << d.year;
	}
};

inline ostream& operator<<(ostream& ost, const date::bad_month& bm) {
	bm.print(ost);
	return ost;
}
#endif