#ifndef ISTREAM_ITERATOR_DATEH
#define ISTREAM_ITERATOR_DATEH
#include <iostream>
#include <iterator>
#include "date.h"
using namespace std;

class istream_iterator_date:
	public iterator<input_iterator_tag, date, ptrdiff_t,
		const date *, const date&> {

	istream *ist;
	bool ok;   //true if this iterator has a healthy istream
	date d;    //the date read most recently from the file

	void read() {
		if (ok) {
			ok = *ist >> d; //ok=operator>>(*ist,d).operator void *();
		}
	}
public:
	istream_iterator_date(istream& initial_is)
		: ist(&initial_is), ok(true) {read();}
	istream_iterator_date(): ist(0), ok(false) {}

	const date& operator*() const {return d;}
	const date *operator->() const {return &**this;}

	istream_iterator_date& operator++() {read(); return *this;}

	friend bool operator==(const istream_iterator_date& it1,
	                       const istream_iterator_date& it2) {
		return it1.ok == it2.ok && (!it1.ok || it1.ist == it2.ist);
	}
};

inline const istream_iterator_date operator++(istream_iterator_date& it, int)
{
	const istream_iterator_date old = it;
	++it;
	return old;
}

inline bool operator!=(const istream_iterator_date& it1,
                const istream_iterator_date& it2) {
	return !(it1 == it2);
}
#endif