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31 lines
744 B
31 lines
744 B
9 months ago
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from __future__ import annotations
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from typing import NoReturn, TypeVar
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from attrs import define as _define, frozen as _frozen
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_T = TypeVar("_T")
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def define(cls: type[_T]) -> type[_T]: # pragma: no cover
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cls.__init_subclass__ = _do_not_subclass
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return _define(cls)
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def frozen(cls: type[_T]) -> type[_T]:
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cls.__init_subclass__ = _do_not_subclass
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return _frozen(cls)
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class UnsupportedSubclassing(Exception):
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pass
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@staticmethod
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def _do_not_subclass() -> NoReturn: # pragma: no cover
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raise UnsupportedSubclassing(
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"Subclassing is not part of referencing's public API. "
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"If no other suitable API exists for what you're trying to do, "
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"feel free to file an issue asking for one.",
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)
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