static function __static()
{
self::$plus = newinstance(__CLASS__, array(0, 'plus'), '{
static function __static() { }
public function evaluate($x, $y) { return $x + $y; }
}');
self::$minus = newinstance(__CLASS__, array(1, 'minus'), '{
static function __static() { }
public function evaluate($x, $y) { return $x - $y; }
}');
self::$times = newinstance(__CLASS__, array(2, 'times'), '{
static function __static() { }
public function evaluate($x, $y) { return $x * $y; }
}');
self::$divided_by = newinstance(__CLASS__, array(3, 'divided_by'), '{
static function __static() { }
public function evaluate($x, $y) { return $x / $y; }
}');
}