c++虚析构函数

虚析构函数的作用主要是当通过基类指针删除派生类对象时，调用派生类的析构函数（如果没有将不会调用派生类析构函数）

#include <iostream>

using namespace std;

class base
{
public:
    base() { cout << "base()" << endl; }
    virtual ~base() { cout << "~base()" << endl; }
};

class derived : public base
{
public:
    derived () { cout << "derived ()" << endl; }
    ~derived () { cout << "~derived ()" << endl; }
};

int main()
{
    base *test = new derived();
    delete test;
}