虚析构函数

#include <iostream>using namespace std;class A{public:virtual ~A() {cout<<"call A::~A()"<<endl;}};class B:public A{char *buf;public:B(int i) {buf=new char[i];}virtual ~B(){delete []buf;cout<<"call B::~()"<<endl;}};void main(){A* a=new B(10);delete a;}