public Quadtree(QuadNode <T> rootnode) { root_ = rootnode; }
public Quadtree(T rootdata) { root_ = new QuadNode <T>(rootdata); }
public Quadtree(QuadNode <T> rootnode) { root_ = rootnode; }
public Quadtree(T rootdata) { root_ = new QuadNode <T>(rootdata); }