67 lines
945 B
C
67 lines
945 B
C
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#define __DEMO_H__
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#ifdef __DEMO_H__
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using namespace std;
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#include <list>
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// <20><><EFBFBD><EFBFBD><EFBFBD>۲<EFBFBD><DBB2><EFBFBD>
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class Observer
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{
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public:
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><D3A6><EFBFBD>·<EFBFBD><C2B7><EFBFBD>
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virtual void update() = 0;
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};
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// <20><><EFBFBD><EFBFBD><EFBFBD>۲<EFBFBD><DBB2><EFBFBD>
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class ConcreteObserver:public Observer
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{
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public:
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// ʵ<><CAB5><EFBFBD><EFBFBD>Ӧ<EFBFBD><D3A6><EFBFBD>·<EFBFBD><C2B7><EFBFBD>
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void update(){
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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}
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};
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// <20><><EFBFBD><EFBFBD>Ŀ<EFBFBD><C4BF>
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class Subject
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{
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public:
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// <20><><EFBFBD>ӹ۲<D3B9><DBB2><EFBFBD>
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void attach(Observer* obs){
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obsList.push_back(obs);
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}
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// <20>Ƴ<EFBFBD><C6B3>۲<EFBFBD><DBB2><EFBFBD>
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void detach(Observer* obs){
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obsList.remove(obs);
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}
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// <20><><EFBFBD><EFBFBD>֪ͨ<CDA8><D6AA><EFBFBD><EFBFBD>
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virtual void notify() = 0;
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protected:
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// <20>۲<EFBFBD><DBB2><EFBFBD><EFBFBD>б<EFBFBD>
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list<Observer*>obsList;
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};
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// <20><><EFBFBD><EFBFBD>Ŀ<EFBFBD><C4BF>
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class ConcreteSubject :public Subject
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{
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public:
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// ʵ<><CAB5>֪ͨ<CDA8><D6AA><EFBFBD><EFBFBD>
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void notify(){
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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// <20><><EFBFBD><EFBFBD>֪ͨ<CDA8>۲<EFBFBD><DBB2>߶<EFBFBD><DFB6><EFBFBD>
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for (int i = 0; i < obsList.size(); i++){
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obsList[i]->update();
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}
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}
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};
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// <20>ͻ<EFBFBD><CDBB>˴<EFBFBD><CBB4><EFBFBD>ʾ<EFBFBD><CABE>
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int main()
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{
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Subject *sub = new ConcreteSubject();
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Observer *obs = new ConcreteObserver();
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sub->attach(obs);
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sub->notify();
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return 0;
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}
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#endif
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