设计模式 - Memento

意图：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。

class Memento
{
friend class Originator;
public:
    ~Memento()
    {}
private:
    Memento(const string& state)
    {
        this->state = state;
    }

private:
    string state;
};

class Originator
{
public:
    Originator()
    {}
    ~Originator()
    {}
    void SetState(const string& state)
    {
        this->state = state;
    }
    Memento* CreateMemento()
    {
        return new Memento(state);
    }
    void SetMemento(Memento* men)
    {
        this->state = men->state;
    }

private:
    string state;
};

 

转载于:https://www.cnblogs.com/lianghuiwen/archive/2013/05/05/3061922.html