7-友元类

#include<bits/stdc++.h>
using namespace std;
//类做友元
class Building;
class GoodGay{
  public:
    GoodGay();//初始化构造函数 
    void visit();//参观函数，访问Building中的属性 
    Building *building;
}; 
class Building{
  //GoodGay是本类的好朋友，可以访问本类的私有成员 
  friend class GoodGay;
  public:
    Building();//构造函数初始化 
  public:
    string m_SittingRoom;//客厅
  private:
    string m_BedRoom;//卧室 
};
//类外写构造函数 
Building ::Building(){
  m_SittingRoom="客厅";
  m_BedRoom="卧室"; 
}
GoodGay::GoodGay(){
  //创建 建造物对象
  building=new Building; 
}
void GoodGay::visit(){
  cout<<"好基友类正在访问: "<<building->m_SittingRoom <<endl;
  cout<<"好基友类正在访问: "<<building->m_BedRoom <<endl;
}
void test(){
  GoodGay gg;
  gg.visit();
}
int main()
{
  test();
  return 0;
}