C++虚函数之接口 最简单的功能

虚函数 ，接口，到底有什么用呢？

以前我都是在C++ 里面写C，只用到 简单的C++面对对象知识

#include<stdio.h>

class IServerLogic{
  virtual ~IServerLogic(){}
public:
  virtual bool OnStart()=0;
  virtual bool OnStop()=0;
};

class ServerLogic:public IServerLogic{
public:
  virtual bool OnStart(){printf("OnStart
");return true;};
  virtual bool OnStop(){printf("OnStop
");return true;};
};
class ServerFactory{
public:
  static ServerLogic* Create(){return new ServerLogic();}
};

int main(){
  IServerLogic *iserverlogic=ServerFactory::Create();
  iserverlogic->OnStart();
  iserverlogic->OnStop();
    delete iserverlogic;
    
    return 0;
}