备忘录模式

来源：互联网发布：java 内存泄漏工具编辑：程序博客网时间：2024/06/16 03:26

#include <iostream>#include <string>using namespace std;class Mememto{public:Mememto() {}Mememto(string strState) : m_strState(strState) {}const string& getState() { return m_strState; }private:string m_strState;};class Originator{public:void setState(string strState) { m_strState = strState; }void showState() { cout << m_strState << endl; }Mememto createMemto() { return Mememto(m_strState); }void setMememto(Mememto objMememto) { m_strState = objMememto.getState(); }private:string m_strState = "";};class Caretaker{public:void setMememto(Mememto objMememto) { m_objMememto = objMememto; }Mememto getMememto() { return m_objMememto; }private:Mememto m_objMememto;};int main(){Originator objOriginator;objOriginator.setState("彳亍");objOriginator.showState();Caretaker objCaretaker;objCaretaker.setMememto(objOriginator.createMemto());objOriginator.setState("nullptr");objOriginator.showState();objOriginator.setMememto(objCaretaker.getMememto());objOriginator.showState();return 0;}

总结：在不破坏封装性的前提下，捕获一个对象的内部状态，并在该对象之外保存这个状态。这样以后就可将该对象恢复到原先保存的状态。如果状态过多，会占用过多的资源

0 0