楼主的给的代码优点小问题，已修正，能跑了 class x { public: virtual void f(){ cout << "x" << endl; } }; class a :public x { public: virtual void f(){ cout << "a" << endl; } }; class b :public x { public: virtual void f(){ cout << "b" << endl; } }; class d :public a { public: virtual void f(){ cout << "d" << endl; } }; class e :public a { public: virtual void f(){ cout << "e" << endl; } }; int main() { vector<void*> v; /*1\. 对于自定义类类型： 如果该类没有定义构造函数（由编译器合成默认构造函数）但有虚函数， 那么class c = new class;和class c = new class();一样，都会调用默认构造函数。 */ v.push_back(new d); v.push_back(new a); v.push_back(new x); v.push_back(new b); v.push_back(new e); for (int i = 0; i<v.size(); i++) { static_cast<b*>(v[i])->f(); } return 0; }