Question

I’m a beginner, I Make a treap tree , I make a class type and pointer to this class , when I used “this keyword” to point to next element this appeared

compiler error: “expression must have pointer-to-class type”

 this->right->search_el(k,p);

Answer 1

It means that you apply operator -> to a non-pointer type. You probably want:

this->right.search_el(k,p);

Since this is a pointer, right seems like the only candidate that is not a pointer. In C++, you access members of a class through . if you have an instance or -> if you have a pointer to an instance.