How to call a non static member function from a static member function without passing class instance

Question

I need to call a non static member function from a static member function of the same class. The static function is a callback. It can receive only void as data, though whic

Answer 1

This is the only way :

#include 
#include 

struct A;
A *oneObj = NULL;


struct A
{
  A(){
    oneObj=this;
  }
  ~A(){
    oneObj=NULL;
  }
  void foo()
  {
  }

  static void boo()
  {
    assert( NULL != oneObj );
    oneObj->foo();
  }
};

int main()
{
  A onlyOne;
  A::boo();
}