// generates undefined error for the operator<< function#ifndef ARRAY_H#define ARRAY_H#include <iosfwd>#include <stdlib.h>#include <iostream>template<class T> class array {	int size;public:	array();	template<class T> friend std::ostream&　　　　　　　　　　　　　　　//不要少了template<class T>		operator<<(std::ostream&, const array<T>&);};template<class T> array<T>::array() { size = 1024; }template<class T>  std::ostream&	operator<< (std::ostream& out, const array<T>& rhs){	return out << ‘[‘ << rhs.size << ‘]‘;}#endif