How to call a parent class function from derived class function?

Question

How do I call the parent function from a derived class using C++? For example, I have a class called parent, and a class called child which is deri

Answer 1

struct a{
 int x;

 struct son{
  a* _parent;
  void test(){
   _parent->x=1; //success
  }
 }_son;

 }_a;

int main(){
 _a._son._parent=&_a;
 _a._son.test();
}

Reference example.