基类指针赋值兼容规则

/* 赋值兼容规则 作者：qpz */#include <iostream>#include <vector>using namespace std;class Base{private: int x; int y;public: Base(int x,int y) { this->x=x; this->y=y; }};class Derived:public Base{private: int z;public: Derived(int z):Base(z-1,z+1) { this->z=z; }};int main(void){ //Derived *p=new Base(2,1);//因为派生类指针映射范围大 Base *p=new Derived(1); delete p; return 0;}