备忘录模式(状态变化)

来源：互联网发布：华为杭州研究所知乎编辑：程序博客网时间：2024/05/22 02:18
#include <iostream>#include <string>#include <vector>using namespace std;//备忘录模式：备忘录对象是一个用来存储另外一个对象内部状态的快照的对象。//备忘录模式的用意是在不破坏封装的条件下，将一个对象的状态捉住，//并外部化，存储起来，从而可以在将来合适的时候把这个对象还原到存储起来的状态。//设计需要回放的软件，记录一下事物的状态。数据库备份，文档的编译，撤销，恢复//设计备忘录三大步骤//1.设计记录的节点，存储记录，记录鼠标，键盘的状态//2.设计记录的存储，vector,list，map,set,链表，图，数组，树//3.操作记录的类，记录节点状态，设置节点状态，显示状态，0.1秒记录一下//备忘录的节点，class Memo{public:string state;Memo(string state) //记录当前的状态，{this->state = state;}};class Originator//类的包含备忘录的节点{public:string state;void setMemo(Memo *memo){state = memo->state;}Memo *createMemo(){return new Memo(state);}void show(){cout << state << endl;}};//备忘录的集合class Caretaker{public:vector<Memo *> memo;void save(Memo *memo){(this->memo).push_back(memo);}Memo *getState(int i){return memo[i];}};int main(){Originator *og = new Originator();Caretaker *ct = new Caretaker();og->state = "on";og->show();ct->save(og->createMemo());og->state = "off";og->show();ct->save(og->createMemo());og->state = "middle";og->show();ct->save(og->createMemo());og->setMemo(ct->getState(1));og->show();og->setMemo(ct->getState(2));og->show();cin.get();return 0;}
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