import t
from t import CInt


# ============================================================
# 跨模块 isinstance 测试库
#
# 供 main.vp import 使用：验证 isinstance 对"定义在其他模块
# 的类"也能正确比较（对象 vtable 指针跨 obj 链接解析）。
# ============================================================


@t.CVTable
class Shape:
    def area(self) -> CInt:
        return 0


@t.CVTable
class Circle(Shape):
    r: CInt

    def __init__(self, r: CInt):
        self.r = r

    def area(self) -> CInt:
        return self.r


@t.CVTable
class Square(Shape):
    s: CInt

    def __init__(self, s: CInt):
        self.s = s

    def area(self) -> CInt:
        return self.s


@t.NoVTable
class PlainShape:
    tag: CInt