1.用宏调用对象函数

#define FOR_EACH_OBSERVER(ObserverType, observer_list, func) \    do{ \      CObserverListBase
    
     ::Iterator it(observer_list); \      ObserverType* obs; \      while((obs=it.GetNext()) != NULL) \        obs->func; \    } while(0)
    

调用方式

//     void NotifyBar(int x, int y) {//       FOR_EACH_OBSERVER(Observer, observer_list_, OnBar(this, x, y));//     }

2.用宏定义函数指针来转发

定义:

class TestDelegate{public:    void Test(int i)    {        i=1;    }    void Test2(int i,int j)    {        i=1;    }    void (Test22)(int i,int j)    {        //((this)->*(&TestDelegate::Test))(i);    }};#define __IMPLEMENT_COMSINK_FUNCTION(func, params, values) \    typedef void (T::*F##func)params;\    void Hook_##func(F##func pf##func) \{ \    m_pf##func = pf##func; \} \    void (func)params \{ \    ((m_pT)->*(m_pf##func))values; \} \private:\    F##func m_pf##func;template
    
     class DelegateHandler{public:    DelegateHandler(T* pT,void (T::*pFunc)(int))        :m_pT(pT),m_pFunc(pFunc)    {    }    __IMPLEMENT_COMSINK_FUNCTION(OnEvent,(int a,int b),(a,b))private:    T* m_pT;    void (T::*m_pFunc)(int);};
    

调用

TestDelegate td;DelegateHandler
    
      dh(&td,&TestDelegate::Test);dh.Hook_OnEvent(&TestDelegate::Test2);dh.OnEvent(4,3);