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path: root/lib/sqlalchemy/util/typing.py
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from typing import Any
from typing import Generic
from typing import overload
from typing import Type
from typing import TypeVar

from . import compat

if compat.py38:
    from typing import Literal
    from typing import Protocol
    from typing import TypedDict
else:
    from typing_extensions import Literal  # noqa
    from typing_extensions import Protocol  # noqa
    from typing_extensions import TypedDict  # noqa


if compat.py311:
    from typing import NotRequired  # noqa
else:
    from typing_extensions import NotRequired  # noqa


_T = TypeVar("_T")


class _TypeToInstance(Generic[_T]):
    @overload
    def __get__(self, instance: None, owner: Any) -> Type[_T]:
        ...

    @overload
    def __get__(self, instance: object, owner: Any) -> _T:
        ...

    @overload
    def __set__(self, instance: None, value: Type[_T]) -> None:
        ...

    @overload
    def __set__(self, instance: object, value: _T) -> None:
        ...