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

class istream_iterator {
	istream *p;
public:
	istream_iterator(istream *initial_p = 0): p(initial_p) {}
	const int operator*() {int i; *p >> i >> ws; return i;}
	istream_iterator& operator++() {return *this;}

	friend bool operator==(const istream_iterator& it1,
	                       const istream_iterator& it2) {
		return (it1.p == 0 || it1.p->eof()) &&
		       (it2.p == 0 || it2.p->eof());
	}
};

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