（C++）基类的析构函数为虚函数的优点

代码：

#include <iostream>
using namespace std;

class CBase
{
public:
    CBase() {}
    virtual ~CBase() { cout << "destructor of class CBase" << endl; }
    virtual void something() { cout << "do something in CBase" << endl; }
};

class CDerive : public CBase
{
public:
    CDerive() {}
    ~CDerive() { cout << "destructor of class CDerive" << endl; }
    void something() { cout << "do something in CDerive" << endl; }
};

int main()
{
    CBase *b = new CDerive;
    b->something();
    delete b;
    return 0;
}

此时输出的是：

do something in CDerive

destructor of class CDerive

destructor of class CBase

如果将CBase里面的析构函数前面的virtual去掉，输出结果却为：

do something in CDerive

destructor of class CBase

可以看出来子类CDerive里面的析构函数根本就没有执行。关于这其中的玄机，暂时还没有精力去研究，不过看了两篇博客大致明白了意思：

http://blog.csdn.net/pathuang68/article/details/4156308

 

http://blog.csdn.net/pathuang68/article/details/4101970

感觉很多东西必须知其所以然才行，期待寒假再跟着上面的博主研究透彻《C++对象内存布局》