private function classGet()
    {
        return isset( $this->class )
            ? $this->class
            : (
                  ( $firstElement = $this->firstElementGet() )
                ? ( $this->class = get_class( $firstElement ) )
                : null
              )
            ;
    }
private function classGet()
    {
        return isset( $this->class )
            ? $this->class
            : (
                  ( $firstElement = $this->firstElementGet() )
                ? ( $this->class = get_class( $firstElement ) )
                : null
              )
            ;
    }
private function classGet ( ) { return isset ( $ this -> class ) ? $ this -> class : ( ( $ firstElement = $ this -> firstElementGet ( ) ) ? ( $ this -> class = get_class ( $ firstElement ) ) : null ) ; }
Get the class of this container.
@return string Class | null
Get the class of this container .