#include "stdafx.h"
#include<iostream>
using namespace std;
//---------------------
class TNode
{
    friend class TList;
    friend ostream& operator<<(ostream& os,TNode& node);
public:
    TNode(int data=0);
   
private:
    int m_data;
    TNode* next;
};
ostream& operator<<(ostream& os,TNode& node)
{
    os<<node.m_data;
    return os;
}
TNode::TNode(int data)
{
    m_data = data;
    next = NULL;
}

//----------------------
class TList
{
public:
    void InsertFirst(int data);
    void InsertLast(int data);
public:
    void Show();
private:
    TNode* Tail();
private:
    TNode head;
};
void TList::Show()
{
    TNode* p = this->head.next;
    while(p != NULL)
    {
        cout<<(*p)<<" ";
        //
        p = p->next;
    }
    cout<<endl;
   
}
TNode* TList::Tail()
{
    //节点的next==NULL
    TNode* p = &head;
    while(p->next != NULL)
         p = p->next;
    return p;
}
void TList::InsertLast(int data)
{
    //找到最后一个节点
    TNode* last = Tail();
    //创建一个新节点：构造函数中赋值
    TNode* pNode = new TNode(data);
    //插入链表：位置
    last->next = pNode;

}
void TList::InsertFirst(int data)
{
    //创建一个新节点：构造函数中赋值
    TNode* pNode = new TNode(data);
    //插入链表：位置
    pNode->next = this->head.next;
    this->head.next = pNode;
}
//=========================================
//
template<class T>
T Add(T x,T y)
{
    return x+y;
}
//----------------------------------------
int main(int argc, char* argv[])
{
    TList lst;
    lst.InsertFirst(1);
    lst.InsertFirst(10);
    lst.InsertFirst(19);
    lst.InsertLast(29);
    lst.InsertLast(129);

    lst.Show();

    int n = Add(1,10);
    double fn = Add<double>(1.0,2.3);
    //------------------------
    return 0;
}

error C2248: 'm_data' : cannot access private member declared in class 'TNode'
        list\list.cpp(16) : see declaration of 'm_data'
list\list.cpp(48) : error C2593: 'operator <<' is ambiguous

什么意思啊这错误

不是已经定义友元了吗，那个是友元函数

恩  那个运算符重载的怎么回事啊