C++类静态对象的问题

2017-07-12 03:09:41 261 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

C++只能实例化一个对象的类 # include # include using namespace std;1.创建类class Student { public: static Student* Limit(); //静态成员函数 void display(); private: static Student *total; //静态数据成员指针阅读详情



#include <iostream>

using namespace std;



class Base

{

public:

    Base()

    {   

        m_p = this;

    }   

    virtual void func() { m_p->print(); }



    virtual void print() { cout << "Base" << endl; }



    static Base* m_p;

};



Base * Base::m_p = NULL;



class Derive : public Base

{

public:

    void print() { cout << "Derive" << endl; }

};



int main()

{

    Base * pDerive = new Derive;

    Base * pBase = new Base;

    pBase->func();

    pDerive->func();

    return 0;

}

打印
Base
Base
如果
int main()
{
Base * pBase = new Base;
Base * pDerive = new Derive;
pBase->func();
pDerive->func();
return 0;
}
这样写打印
Derive
Derive
为什么会结果不一样

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