c++回调函数

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CallbackProxy.h

#ifndef __CALLBACK_PROXY_H__#define __CALLBACK_PROXY_H__    //Tobject:调用对象的类型，Tparam回调函数参数的类型  template<typename Tobject, typename Tparam>  class CCallbackProxy  {  //指向Tobject类型对象的成员函数指针,参数类型为Tparam*    typedef void (Tobject::*CbFun)(Tparam*);    public:  //设置回调函数    void Set(Tobject *pInstance, CbFun pFun);  //调用回调函数      bool Exec(Tparam* pParam);    private:          CbFun       pCbFun;     //指向Tobject类型对象的成员函数指针      Tobject*    m_pInstance;    //指向Tobject类型对象指针  };   //注意: 下面格式的写法！！！//设置调用对象及其回调函数  template<typename Tobject, typename Tparam>  void CCallbackProxy<Tobject, Tparam>::Set(Tobject *pInstance , CbFun pFun)  {      m_pInstance = pInstance;       pCbFun = pFun;  };      //调用回调函数  template<typename Tobject, typename Tparam>  bool CCallbackProxy<Tobject, Tparam>::Exec(Tparam* pParam)  {      (m_pInstance->*pCbFun)(pParam);      return true;  }    #endif

test.cpp

#include <stdio.h> #include <iostream> #include "CallbackProxy.h" using namespace std; //对象声明 class CTest  {  public:      CTest(int nNum);      void CbPrintSum(int *pnAddNum){printf("The Sum is %d\n", m_nSum+*pnAddNum);};    private:      int m_nSum;  };  CTest::CTest(int nNum):  m_nSum(nNum)  {    }   int main(int argc,  char* argv[])  {  //定义回调对象    CCallbackProxy<CTest, int> CbProxy;    //定义test对象    CTest TestInstance(100);    //将test对象以及该对象的函数注册给回调对象    CbProxy.Set(&TestInstance, &CTest::CbPrintSum);        //执行回调对象的函数即调用test对象的函数CbPrintSum()    int nNum = 50;      CbProxy.Exec(&nNum);        return 0;  }

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