#include<iostream> using namespace std; class A { public: A() { p = new char[20]; strcpy(p,"obja"); printf("A()--构造\n"); } virtual ~A() { delete[] p; printf("A()--析构\n"); } protected: private: char *p; }; class B : public A { public: B() { p = new char[20]; strcpy(p,"obja"); printf("B()--构造\n"); } ~B() { delete[] p; printf("B()--析构\n"); } protected: private: char *p; }; class C : public B { public: C() { p = new char[20]; strcpy(p,"obja"); printf("C()--构造\n"); } ~C() { delete[] p; printf("C()--析构\n"); } protected: private: char *p; }; //只执行了父类的析构函数 //通过父类指针 把 所有的子类对象的析构函数 都执行一遍 //想通过父类指针析构所有资源要加virtual void howtodelete(A *base) { delete base;//这句话不会表现成多态这种属性 } int main() { C *myC = new C; howtodelete(myC); system("pause"); return 0; }
