protected function hasChange() {
    return !( $this->bound1() == $this->node->getRight() || $this->bound1() == $this->node->getLeft() );
  }
protected function hasChange() {
    return !( $this->bound1() == $this->node->getRight() || $this->bound1() == $this->node->getLeft() );
  }
protected function hasChange ( ) { return ! ( $ this -> bound1 ( ) == $ this -> node -> getRight ( ) || $ this -> bound1 ( ) == $ this -> node -> getLeft ( ) ) ; }
Check wether there should be changes in the downward tree structure.

@return boolean
Check wether there should be changes in the downward tree structure .