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18 lines
442 B
Python
18 lines
442 B
Python
# from typing import TypeVar, Union, _SpecialForm, _type_check
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class Error:
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def __init__(self, message):
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self.message = message
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# T = TypeVar("T")
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# @_SpecialForm
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def Result(self, parameters):
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"""Result type.
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Result[T] is equivalent to Union[T, Error].
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"""
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# arg = _type_check(parameters, f"{self} requires a single type.")
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return [arg, Error]
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def is_ok(obj) -> bool:
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return not isinstance(obj, Error)
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