#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
using namespace std;
class Observer
{
public:
Observer(){}
virtual ~Observer(){}
virtual void run()=0;
protected:
string _name;
};
class atlete : public Observer
{
public:
atlete(string name){_name=name;}
virtual ~atlete(){}
void run()
{
cout<<"atlete "<<_name<<" run"<<endl;
}
};
class Subject
{
public:
Subject(){}
virtual void notify()=0;
virtual void attach(Observer*)=0;
virtual void detach(Observer*)=0;
protected:
vector<Observer*> vec;
};
class referee : public Subject
{
public:
referee(){}
virtual ~referee(){}
void attach(Observer* p)
{
vec.push_back(p);
}
void detach(Observer* p)
{
vec.erase(remove_if(vec.begin(),vec.end(),bind1st(equal_to<Observer*>(),p)));
}
void notify()
{
cout<<"referee say 'run'"<<endl;
vector<Observer*>::iterator it;
for (it=vec.begin();it!=vec.end();it++)
{
(*it)->run();
}
}
};
int main()
{
Observer *pat1=new atlete("zhangsan");
Observer *pat2=new atlete("lisi");
Observer *pat3=new atlete("wangwu");
Subject *pre=new referee;
pre->attach(pat1);
pre->attach(pat2);
pre->attach(pat3);
pre->notify();
cout<<endl;
pre->detach(pat2);
pre->notify();
delete pat1;
delete pat2;
delete pat3;
delete pre;
system("pause");
return 0;
}
原文链接: https://www.cnblogs.com/tiandsp/archive/2012/06/28/2568834.html
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