Source code for stdlibx.result.types

 1from __future__ import annotations
 2
 3from typing import Callable, Literal, Protocol, TypeVar, runtime_checkable
 4
 5from typing_extensions import TypeAlias
 6
 7T = TypeVar("T")
 8E = TypeVar("E")
 9U = TypeVar("U")
10
11Operation: TypeAlias = Callable[[T], U]
12
13

[docs]
14@runtime_checkable
15class Ok(Protocol[T]):
16    __match_args__ = ("value",)
17    value: T
18

[docs]
19    def is_ok(self) -> Literal[True]: ...


[docs]
20    def is_err(self) -> Literal[False]: ...


[docs]
21    def apply(self, operation: Operation[Result[T, E], U]) -> U: ...


22
23

[docs]
24@runtime_checkable
25class Error(Protocol[E]):
26    __match_args__ = ("error",)
27    error: E
28

[docs]
29    def is_ok(self) -> Literal[False]: ...


[docs]
30    def is_err(self) -> Literal[True]: ...


[docs]
31    def apply(self, operation: Operation[Result[T, E], U]) -> U: ...


32
33
34Result: TypeAlias = Ok[T] | Error[E]