// 定義:提供一種方法順序當問一個聚合對象中的各個元素，而不 // 暴露該對象的內部表示 // // 模式舉例: // // 模式特點: // //#include<iostream> #include<string> #include<vector> using namespace std;//迭代器 class Iterator { public:virtual string first()=0;virtual string next()=0;virtual string getCur()=0;virtual bool isEnd()=0; };//pop肯定要是彈出元素啦！！！//聚合對象 class Aggregate { public:virtual void push(string s)=0;virtual string pop(int pos)=0;virtual string getValue(int pos)=0;virtual int count()=0;virtual Iterator * createIterator()=0; };class ConcreteIterator : public Iterator { public:ConcreteIterator(Aggregate *a){m_aggregate = a;m_curPos = 0;}virtual string first(){return m_aggregate->getValue(0);}virtual string next(){m_curPos ++;if(m_curPos < m_aggregate->count()){return m_aggregate->getValue(m_curPos);}else{return "";}}virtual string getCur(){return m_aggregate->getValue(m_curPos);}virtual bool isEnd(){return m_curPos==m_aggregate->count();}private:Aggregate * m_aggregate;int m_curPos; };class ConcreteAggregate : public Aggregate { public:ConcreteAggregate(){m_iter = NULL;}virtual void push(string s){m_strvec.push_back(s);}virtual string pop(int pos){string str = m_strvec[pos];m_strvec.erase(pos);return str;}virtual string getValue(int pos){return m_strvec[pos];}virtual int count(){return m_strvec.size();}virtual Iterator * createIterator(){if(m_iter==NULL){m_iter = new ConcreteIterator(this);}return m_iter;}private:vector<string> m_strvec;Iterator * m_iter; };int main() {Aggregate * pAggregate = new ConcreteAggregate();Iterator * iter = pAggregate->createIterator();pAggregate->push("test1");pAggregate->push("test2");pAggregate->push("test3");while(!iter->isEnd()){cout<<iter->getCur()<<endl;iter->next();}return 0; }

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