在定义虚类尤其是纯虚类时，请注意将虚类的析构函数设计为虚拟函数，否则其子类实例的内存释放操作将不正常。如：
Packets.h
#include
class CPacket
{
public:
virtual ~CPacket() {};
virtual void Initialize() = 0;
...
};
class CDeliverPacket: public CPacket
{
public:
virtual ~CDeliverPacket() {std::cout << "CDeliverPacket Destroy" << std::endl;};
virtual void Initialize() {std::cout << "CDeliverPacket Initialize" << std::endl;};
};
main.cpp
#include "Packets.h"
int main(int argc, char **argv)
{
CPacket *pPacket = new CDeliverPacket();
pPacket->Initialize();
delete pPacket;
}
输出：
CDeliverPacket Initialize
CDeliverPacket Destroy
蓝色的代码看似无用，但如果没有那一行将不会调用显示CDeliverPacket Destroy等代码。