Reference to non-static member function must be called

Question

I'm using C++ (not C++11). I need to make a pointer to a function inside a class. I try to do following:

void MyClass::buttonClickedEvent( int buttonId ) {     // I need to have an access to all members of MyClass's class }  void MyClass::setEvent() {      void ( *func ) ( int );      func = buttonClickedEvent; // <-- Reference to non static member function must be called  }  setEvent(); 

But there's an error: "Reference to non static member function must be called". What should I do to make a pointer to a member of MyClass?

Answer 1

The problem is that buttonClickedEvent is a member function and you need a pointer to member in order to invoke it.

Try this:

void (MyClass::*func)(int); func = &MyClass::buttonClickedEvent; 

And then when you invoke it, you need an object of type MyClass to do so, for example this:

(this->*func)(<argument>); 

http://www.codeguru.com/cpp/cpp/article.php/c17401/C-Tutorial-PointertoMember-Function.htm