虚拟继承和虚基类

在c++中，虚拟继承（virtual inheritance）和虚基类（virtual base class）是多重继承（multiple inheritance）中的内容，用来解决diamond problem。
先来看一个例子

#include <iostream>
using namespace std;
class Animal {
public:
    void eat(){cout<<"delicious!"<<endl;}
};

// Two classes virtually inheriting Animal:
class Mammal :  virtual public  Animal {
public:
    void breathe(){}
};

class WingedAnimal :  virtual public Animal {
public:
    void flap(){}
};

// A bat is still a winged mammal
class Bat : public Mammal, public WingedAnimal {
};

int main(){
    Bat b;
    b.eat();
    return 0;
}

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