备忘录模式

#include 
#include 
using namespace std;

class RoleStateMemento;

class GameRole {
private :
    int vit;
    int attack;
    int def;
    
public:
    void setVitality(int vitality){vit = vitality;}
    void setDefence(int defence){def = defence;}
    void setAttack(int attack) {this->attack = attack;}
    
    int getVitality(){return vit;}
    int getDefence(){return def;}
    int getAttack(){return attack;}
    
    void StateDisplay(){
        cout<<"current state:"<memento = memento;}
    RoleStateMemento * getMemento(){return memento;}
};

//.m

RoleStateMemento * GameRole::SaveState() {
    return new RoleStateMemento(vit,attack,def);
}

void GameRole::RecoveryState(RoleStateMemento *memento) {
    this->vit = memento->getVitality();
    this->attack = memento->getAttack();
    this->def = memento->getDefence();
}

void testLesson14(){
    GameRole * lixiaoyao = new GameRole();
    lixiaoyao->GetInitState();
    lixiaoyao->StateDisplay();
    
    RoleStateCaretaker * stateAdmin = new RoleStateCaretaker();
    stateAdmin->setMemento(lixiaoyao->SaveState());
    
    lixiaoyao->Fight();
    lixiaoyao->StateDisplay();
    
    lixiaoyao->RecoveryState(stateAdmin->getMemento());
    lixiaoyao->StateDisplay();
    

}

备忘录模式： 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种状态，这样以后就可将该对象恢复到原先保存的状态。
缺点：角色状态需要完整存贮到备忘录对象中，如果数据很大很多，就会在资源的消耗上比较大。