C++ 虚函数

class Animal {
public:
    // 编译时静态绑定
    void print1() {
        printf("print1 parent class.\n");
    }
    // 虚函数，告诉编译器，运行时动态绑定。
    virtual void print2() {
        printf("print2 parent class.\n");
    }
};

class Dog: public Animal {
public:
    void print1() {
        printf("print1 Dog class.\n");
    }
    void print2() {
        printf("print2 Dog class.\n");
    }
};

Animal *pAni;
Dog dog;
pAni = &dog;
pAni->print1();
pAni->print2();

输出：
print1 parent class.
print2 Dog class.