9.15总结

课程学习C#

include

include

include

using namespace std;
class MyObserver
{
public:
virtual void response1() = 0;
virtual void response2() = 0;
};

class Investor:public MyObserver
{
public:
void response1(){
cout<<"股民买股票"<<endl;
}
void response2(){
cout<<"股民大哭一场"<<endl;
}
};
class Subject
{
public:
Subject(){}
virtual ~Subject(){}
virtual void attach(MyObserver *observer)=0;
virtual void detach(MyObserver *observer)=0;
virtual void stockUp()=0;
virtual void stockDown()=0;
};
class Stock:public Subject
{
public:
void attach(MyObserver observer)
{
observers.push_back(observer);
}
void detach(MyObserver observer)
{
vector<MyObserver>::iterator observer_rm = find(observers.begin(), observers.end(), observer);
observers.erase(observer_rm);
}
void stockUp()
{
cout<<"股票上涨5%"<<endl;
vector <MyObserver >::iterator iObserver = observers.begin();
while(iObserver != observers.end())
{
(iObserver)->response1();
iObserver++;
}
}
void stockDown()
{
vector <MyObserver >::iterator iObserver = observers.begin();
cout<<"股票下降5%"<<endl;
while(iObserver != observers.end())
{
(iObserver)->response2();
iObserver++;
}
}
private:
vector<MyObserver> observers;
};
int main()
{
Stock subject;
Investor obs;
subject.attach(&obs);
subject.stockUp();
subject.stockDown();
}