//
// Created by andrew on 2020年11月28日.
//
#include <iostream>
#include <list>

using namespace std;

class Secretary;

// 观察者
class PlayerObserver{
public:
 explicit PlayerObserver(Secretary *secretary){
 this->m_secretary = secretary;
 }
 // 没有操作任何私有变量,建议使用 static 类型函数
 void update(const string& action){
 cout << "action" << action << endl;
 cout << "boss is coming" << endl;
 }

private:
 Secretary *m_secretary;
};

class Secretary{
public:
 Secretary(){
 m_list.clear();
 }
 void Notify(string info){
 // 给所有的 观察者 发送情报
 for(auto it=m_list.begin();it!=m_list.end();it++)
 {
 (*it)->update(info);
 }
 }

 void setPlayerObserver(PlayerObserver *o){
 m_list.push_back(o);
 }

private:
 list<PlayerObserver *>m_list;
};

int main(int argc, char* argv[]){

 Secretary *secretary = nullptr;
 PlayerObserver *playerObserver1 = nullptr;
 PlayerObserver *playerObserver2 = nullptr;

 secretary = new Secretary;
 playerObserver1 = new PlayerObserver(secretary);
 playerObserver2 = new PlayerObserver(secretary);

 secretary->setPlayerObserver(playerObserver1);
 secretary->setPlayerObserver(playerObserver2);

 secretary->Notify("boss is coming");
 secretary->Notify("boss in gone");

 delete playerObserver1;
 delete playerObserver2;
 delete secretary;

 cout << "observer demo" << endl;
 return 0;
}