Question

I am trying to give a class event functions such as .onShow() and .onHide(), so when the object is shown, the .onShow() function will run. How can I allow the function to be change like so:

MyClass myInst = MyClass();
myInst.onShow = OnShowFunction;

Is it possible to allow this?

Answer 1

This is how you do it (and impress/horrify your cow-orkers at the same time):

#include <iostream>

class MyClass
  {
public:
  void (MyClass::*OnShow)() ;
  void OnShowFunction() ;
  } ;

int main (int argc, char** argv)
  {
  MyClass C ;
  C.OnShow = MyClass::OnShowFunction ;
  (C.*C.OnShow)() ;
  }

void MyClass::OnShowFunction()
  {
  std::cout << "void MyClass::OnShowFunction()\n" ;
  }