C++回调函数尝试

#include "stdafx.h"#include <iostream>//int FunA(int& refInt)//call back function//{//std::cout<<refInt<<std::endl;//return 0;//}//typedef int(*CallBack) (int& ref);//define CallBack as the function pointer////int (*pFun) (int& ref);//pFun points to the function which inputs int& and outputs int//////void FunB(CallBack funCB, int& refInt)//this function calls callback function FunA//{//funCB(refInt);//call FunA to do sth.//}class Line{public:Line(){}virtual ~Line(){}typedef void(*CallBack) (char *pChar);void DrawLine(char *pInChar, CallBack callFun){std::cout<<"Line is ready to draw!"<<std::endl;callFun(pInChar);}};class Canvas{public:Canvas():m_pChar(""){}virtual ~Canvas(){}typedef void(*CallBack) (char *pChar);static void DoDrawLine(char *pChar){std::cout<<"Canvas is drawing!"<<std::endl;std::cout<<pChar<<std::endl;}void SetCallBack(){CallBack cbFun;cbFun = DoDrawLine;m_line.DrawLine(m_pChar, cbFun);}public:char *m_pChar;Line m_line;};int _tmain(int argc, _TCHAR* argv[]){//int iNum = 5;//CallBack funCallBack;//funCallBack = FunA;//FunB(funCallBack, iNum);//inform funCallBack function to do sth.Canvas& refCvs = Canvas();refCvs.m_pChar = "Hello!";refCvs.SetCallBack();return 0;}