Method make_root

src/include/cpp-btree/btree.h:503–506

  // be a leaf.
  bool is_root() const { return parent()->leaf(); }
  void make_root() {
    assert(parent()->is_root());
    set_parent(parent()->parent());
  }

  // Getters for the key/value at position i in the node.
  const key_type& key(int i) const { return params_type::key(slot(i)); }