c++的设计模式之备忘录模式

来源：互联网发布：汕头钦差知乎编辑：程序博客网时间：2024/05/16 10:44

备忘录模式就是能够存储当前状态，类似于玩游戏的时候可以不断的读档，同时在玩了新的游戏的时候，又可以更新到档案里。

#include <iostream>#include <vector>using namespace std;//需保存的信息  class Memento    {  public:  int m_vitality; //生命值  int m_attack;   //进攻值  int m_defense;  //防守值  public:  Memento(int vitality, int attack, int defense):   m_vitality(vitality),m_attack(attack),m_defense(defense){}  Memento& operator=(const Memento &memento)   {  m_vitality = memento.m_vitality;  m_attack = memento.m_attack;  m_defense = memento.m_defense;  return *this;  }  };  //游戏角色  class GameRole    {  private:  int m_vitality;  int m_attack;  int m_defense;  public:  GameRole(): m_vitality(100),m_attack(100),m_defense(100) {}  Memento Save()  //保存进度，只与Memento对象交互，并不牵涉到Caretake  {   Memento memento(m_vitality, m_attack, m_defense);  return memento;  }  void Load(Memento memento)  //载入进度，只与Memento对象交互，并不牵涉到Caretake  {  m_vitality = memento.m_vitality;  m_attack = memento.m_attack;   m_defense = memento.m_defense;  }  void Show() { cout<<"vitality : "<< m_vitality<<", attack : "<< m_attack<<", defense : "<< m_defense<<endl; }  void Attack() { m_vitality -= 10; m_attack -= 10;  m_defense -= 10; }  };  //保存的进度库  class Caretake    {  public:  Caretake() {}  void Save(Memento menento) { m_vecMemento.push_back(menento); }  Memento Load(int state) { return m_vecMemento[state]; }  private:  vector<Memento> m_vecMemento;  };  //测试案例  int main()  {     Caretake caretake;  GameRole role;   role.Show();   //初始值  caretake.Save(role.Save()); //保存状态  role.Attack();     role.Show();  //进攻后  role.Load(caretake.Load(0)); //载入状态   role.Show();  //恢复到状态0  return 0;  }

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