Programming

template<typename Type> class SingleList;

template<typename Type> class SingleListNode{
private:
	friend class SingleList<Type>;

	SingleListNode() : next(NULL){}

public:
	friend ostream& operator<< <Type>(ostream& os,SingleListNode<Type>& sln);                  //Error!!!

private:
	SingleListNode *next;
};

template<typename Type> ostream& operator<<(ostream& os,SingleListNode<Type>& out){
	os<<out.data;
	return os;
}

template<typename Type> class SingleList{
public:
	SingleList()
        {
            head =	new SingleListNode<Type> () ;                 //Error!!!
        }
	~SingleList(){
		delete head;
	}

private:
	SingleListNode<Type> *head;
};

|| g++ -g -I ./inc/ -c single_list_test.cpp  -o single_list_test.o
|| single_list.h: In instantiation of ‘SingleListNode<int>’:
single_list.h|25 col 13| instantiated from ‘SingleList<Type>::SingleList() [with Type = int]’
single_list_test.cpp|9 col 18| instantiated from here
single_list.h|10 col 18| error: template-id ‘operator<< <int>’ for ‘std::ostream& operator<<(std::ostream&, SingleListNode<int>&)’ does not match any template declaration
|| make: 
*** [single_list_test.o] Error 1