protected function cycle()
    {
        if (!$this->moved) {
            $this->curr->clear();
            $this->curr->merge($this->next);
            $this->next->clear();
            $this->moved = true;
        }
    }
protected function cycle()
    {
        if (!$this->moved) {
            $this->curr->clear();
            $this->curr->merge($this->next);
            $this->next->clear();
            $this->moved = true;
        }
    }
protected function cycle ( ) { if ( ! $ this -> moved ) { $ this -> curr -> clear ( ) ; $ this -> curr -> merge ( $ this -> next ) ; $ this -> next -> clear ( ) ; $ this -> moved = true ; } }
Transitions the values from next to current.
Transitions the values from next to current .