设计模式-观察者模式(c++)

当股票的价格上涨或下降5%时，会通知持有该股票的股民，当股民听到价格上涨的消息时会买股票，当价格下降时会大哭一场。

类图

#include
#include<string>
#include
using namespace std;

class Observer {

public: virtual void moneyUp()=0;
        virtual void moneyDown()=0;//必须纯虚函数
};

class GuMin:public Observer{

private: string name;
public: GuMin(string n) {
        // TODO Auto-generated constructor stub
        name = n;
    }

        void moneyUp() {
        // TODO Auto-generated method stub
        cout<"买了一些股票（股票升了）"<<endl;
    }
        void moneyDown() {
        // TODO Auto-generated method stub
        cout<"股票降价了，哭了"<<endl;
    }

};
class Subject {
protected: list olist;
public:
     Subject() {
        // TODO Auto-generated constructor stub
    }
     void add(Observer *o) {
        olist.push_back(o);
    }
    void remove(Observer *o) {
        olist.remove(o);
    }
    virtual void up(double a){};
    virtual void down(double a){};

};

class GuPiao:public Subject{

public:
    GuPiao() {
        
    }

     void up(double a) {
         if (a > 0.05){
             //list::iterator p = olist.begin();
             for (list::const_iterator p = olist.begin(); p != olist.cend(); ++p){
                 (*p)->moneyUp();
                 //&(*p).moneyUp();
             }
         }
            
    }

    void down(double a) {
        
        if (a > 0.05){
            list::iterator p = olist.begin();
            for (; p != olist.end(); ++p){
                (*p)->moneyDown();
            }
        }
    }

};
int main(){
    
        // TODO Auto-generated constructor stub
         Subject *f = new GuPiao();
     //   Subject     
          GuMin *g1 = new GuMin("李峰股民");
        GuMin *g2 = new GuMin("王磊股民");
        f->add(g1);
        f->add(g2);
        cout<<"股票升了"<<endl;
        f->up(0.1);
        cout<<"比率小于0.05"<<endl;
    
        f->down(0.001);

        cout<<"股票降了"<<endl;
        f->down(0.1);
        cout<<"比率小于0.05"<<endl;
        f->down(0.001);
    

}