code: void reset(Envelope2D extent, int height) {
  		m_quad_tree_nodes.deleteAll(false);
  		m_element_nodes.deleteAll(false);
  		m_data.clear();
  		m_free_data.clear(false);
  		reset_(extent, height);
  	}
docs: Resets the Quad_tree_impl to the given extent and height.
  \param extent The extent of the Quad_tree_impl.
  \param height The max height of the Quad_tree_impl.