Having a hard time understanding how to properly free a stack allocated array, of pointers. Now, some things that I already understand.

1. ✅ Memory of arr automatically freed.

struct Node {
    int arr[4] = {0};
};

2. ✅ Need to explicitly free the arr.

struct Node {
    int* arr = new int[4];

    ~Node() {
        delete[] arr;
    }
};

3. ❓Now arr is stack allocated but it can contain addresses of other Node objects. So
   how do I free them. First idea, I can think of setting each arr[i] to nullptr but it doesn’t actually free the memory of the pointed object. Secondly I can probably iterate through array and call delete arr[i] but since delete actually calls ~Node() it leads to an infinite loop.

struct Node {
    Node* arr[4] = {nullptr};

    ~Node() {
        // ?
    }
};

4. ❓Same as 3rd case but here the array is also heap allocated.

struct Node {
    Node** arr = new Node*[4];

    ~Node() {
        // ?
    }
};