指向类成员函数的指针

与C语言不同的是两种函数调用方法不同的是pf(),(*pf)(),类成员函数指针只能用(*pf)()调用

类成员函数指针的调用方法只能靠对象调用,即使在类内也必须用this->*去调用,静态函数除外

class WOLF;
typedef void(WOLF::* Pf)();//指向类成员函数的类函数指针
class WOLF
{
public:
  WOLF() {
    pGroup = &WOLF::GrouUP0;
  }
  void GrouUP0()
  {
    (this->*pGroup)();//在类内只能通过this调用
    std::cout << "hello world" << std::endl;
  }
  int x;
  Pf pGroup ;//类函数指针数组
};
int main()
{
  WOLF* pWolf = new WOLF;
  Pf pf = pWolf->pGroup;
  (pWolf->*pf)();//因为pWolf->*pGroup()优先级
  (pWolf->*pWolf->pGroup)();
  /*对应22段代码汇编层面,可见是先操作第二个this,再操作第一个this,再用第二个this调用pGroup,最后调用类成员函数
mov         eax,dword ptr [pWolf] 
mov         ecx,dword ptr [pWolf] 
mov         edx,dword ptr [eax+4] 
call        edx
cmp         esi,esp  
call        __RTC_CheckEsp (07C16AEh)
  */
  //(pWolf->*pGroup)();//pGroup无法识别猜测是优先级问题
  Pf pFunction = { &WOLF::GrouUP0 };
  WOLF W1;
  (W1.*pFunction)();
  WOLF *W2 = new WOLF;
  (W2->*pFunction)();
}