C++ Heap Object has Stack or Heap Members?

Question

If I allocate a new object on the heap, are all variables defined within the class of the object also on the heap?

For example, say I have a Node class that has an x, y, z coordinate held within an array called _pos. For the sake of the user creating many Node objects, Node is declared on the heap as:

Node n = new Node(0, 0, 0);

Should I also declare the position array on the heap as:

class Node {
public:
  Node(double x, double y, double z) {
    _pos = new double[3] {x, y, z};
  }

private:
  double* _pos;
}

Or is the _pos array already considered on the heap and the following works as well

class Node {
public:
  Node(double x, double y, double z) {
    _pos = double[3] {x, y, z};
  }

private:
  double* _pos;
}

I'm guessing the second one is also considered on the heap, in which case it also makes deallocation a bit easier, but I'm hoping someone can confirm.

Answer 1

If I allocate a new object on the heap, are all variables defined within the class of the object also on the heap?

Yes.