c++回调实现

来源：互联网发布：牛魔王知乎编辑：程序博客网时间：2024/06/06 14:29

回调是A将一个函数指针传给B，然后调用B，B在执行自身函数后，再在合适的时候执行A的这个函数指针，这样就能避免A和B的相互包含和链接，在大型项目中回调是一种打破循环依赖的常用技术。

typedef void(CALLBACK* MyCallBack)(const char *);typedef void(*MyFuncB)(MyCallBack, const char *);//回调函数void CALLBACK FuncC(const char* pszStr){std::cout << "FunC is Running" << std::endl;if (!pszStr){return;}std::cout << pszStr << std::endl;}//设置回调，并且执行FuncBvoid FuncA(MyFuncB pFunB, MyCallBack pCallBAck, const char * pszStr){std::cout << "FunA is Running" << std::endl;if (pCallBAck && pFunB){pFunB(pCallBAck, pszStr);}}void FunB(MyCallBack pCallBAck, const char * pszStr){std::cout << "FunB is Running" << std::endl;if (pCallBAck){pCallBAck(pszStr);}}void FuncD(void){std::cout << "FunD is Running" << std::endl;}class  CTestA{public:void SetCallBack(MyCallBack pCallBack,const char* pszStr){std::cout << "SetCallBack" << std::endl;if (pCallBack && pszStr){m_pCallBack = pCallBack;m_pszStr = (char*)pszStr;}DoCallBack();}void DoCallBack(){std::cout << "DoCallBack Running" << std::endl;if (m_pCallBack){m_pCallBack(m_pszStr);}}private:MyCallBack m_pCallBack;char* m_pszStr;};class CTestB{public:void static CALLBACK FuncCallBack(const char* pszStr)//非 static比较麻烦{if (pszStr){std::cout << pszStr << std::endl;} }};int _tmain(int argc, _TCHAR* argv[]){FuncA(FunB, FuncC,"hello");FuncD();CTestA a;a.SetCallBack(CTestB::FuncCallBack, "hello");return 0;}

boost::bind也能实现类似功能

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