from dataclasses import dataclass
from enum import IntEnum
from typing import List, Optional


class Presence(IntEnum):
    EMPTY = 0b00
    RESERVED = 0b01
    FULL = 0b10
    WAITING = 0b11


@dataclass
class SMCell(object):
    pres: Presence
    data_l: Optional[int]  # data or length
    data_r: Optional[List[int]]  # optional data
    is_wide: bool = False