将类的成员函数以函数指针的形式赋给另一个类

typedef void (* HW_HANDLE)(int);

 

class Switch{private:    HW_HANDLE   handle;public:    Switch(const HW_HANDLE h = 0 )      { handle=h; }    void Exec()                         { handle(1); }};

 

 

void ShowLog(int v){    printf("this is %d/n",v);}

 

 

class HdApi{public:    HW_HANDLE setConcreteSwitch;

    HdApi()                             { setConcreteSwitch=ShowLog; }};

 

HdApi aHdapi;

int _tmain(int argc, _TCHAR* argv[]){    Switch aSwitch(aHdapi.setConcreteSwitch);    aSwitch.Exec();

 

    return 0;}=======================================================

vs2008上正常运行，但是在vc6.0上编译会失败？？？