// 1. 多继承优缺点
class Flyable
{
public:
    void fly()
    {
        cout << "飞翔..." << endl;
    }

    void sound()
    {
        cout << "嗖嗖..." << endl;
    }
};


class Runnable
{
public:
    void run()
    {
        cout << "跑步..." << endl;
    }

    void sound()
    {
        cout << "刺啦..." << endl;
    }
};

class SuperMan : public Flyable, public Runnable {};
void test01()
{
    SuperMan sm;
    sm.fly();
    sm.run();

    // 1. 多继承可以复用多个类的代码(函数、 变量)
    // 2. 多继承带来二义性问题.
    // sm.sound();
    sm.Flyable::sound();
    sm.Runnable::sound();
}

// 2. 菱形继承问题
class Animal
{
public:
    int m_animal;
};

class Sheep : public Animal 
{
public:
    int m_sheep;
};

class Tuo : public Animal
{

public:
    int m_tuo;
};

class SheepTuo : public Sheep, public Tuo
{
};

void test02()
{
    // 1. 空间浪费
    // 2. 二义性
    SheepTuo st;
    // st.m_animal;
}

// 3. 虚继承 使用virtual关键字

class Animal
{
public:
    Animal(int)
    {
    
    }
public:
    int m_animal;
};

class Sheep :  virtual public Animal
{
public:
    Sheep() : Animal(10) {}
public:
    int m_sheep;
};

class Tuo : virtual public Animal
{
public:
    Tuo() : Animal(10) {}
public:
    int m_tuo;
};

class SheepTuo : public Sheep, public Tuo 
{
public:
    SheepTuo() : Animal(10) {}
};

void test03()
{
    SheepTuo st;
    st.m_animal;
    st.Sheep::m_animal;
    st.Tuo::m_animal;

    Sheep s;
    s.m_animal;
}