listnode.h

来自「学生信息管理系统：本程序可以实现输入」· C头文件 代码 · 共 57 行

#ifndef LIST_NODE_CLASS
#define LIST_NODE_CLASS

#include <fstream.h>

template <class Type>
class LinkedList;					// 前视声明 

template <class Type>
class ListNode
{
	friend class LinkedList<Type>;	// 友元类声明

private:	
	ListNode<Type>* link;

public:
	Type data;

	ListNode(const Type& item, ListNode<Type>* next = NULL)
		:data(item), link(next)
	{}
	
	// 向屏幕输出结点的值
	friend ostream&  operator << (ostream& os, 
		                         const ListNode<Type>& node);
	
	// 向文件输出结点的数据值
	friend ofstream& operator << (ofstream& ofs, 
		                          const ListNode<Type>& node);

	friend ostream& operator << (ostream& os, 
								 const LinkedList<Type>& list);

	friend ofstream& operator << (ofstream& ofs, 
								  const LinkedList<Type>& list);
};

template <class Type>
ostream& operator << (ostream& os, const ListNode<Type>& node)
{
	os << setw(20) << "current node: " << &node << endl
	   << node.data
	   << setw(20) << "next node: " << node.link << endl;
	return os;
}

template <class Type>
ofstream& operator << (ofstream& ofs, const ListNode<Type>& node)
{
	ofs<<"**************************************"<<endl;
	ofs << node.data << endl;
	return ofs;
}

#endif // LIST_NODE_CLASS