运行时类型识别 RTTI

#include <iostream>
using namespace std;

class graphic
{
public:
    virtual void display()=0;
};

class GIF:public graphic
{
    public:
        void display(){    cout << "GIF Image Showing." << endl; }
};

class PIC:public graphic
{
    public:
        void display(){        cout << "PIC Image Showing." << endl; }
};

void main()
{
    GIF gif;
    PIC pic;
    gif.display();
    pic.display();

    bool bGif = typeid(gif) == typeid(GIF);
    bool bPicEqualGif = typeid(pic) == typeid(GIF);
}