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```swift | |
import Combine | |
extension Publisher { | |
func fromResult<T, E>() -> AnyPublisher<T, E> | |
where Self.Failure == Never, Self.Output == Result<T, E>, E: Error { | |
setFailureType(to: E.self) | |
.tryMap { (result: Self.Output) -> T in | |
switch result { | |
case .success(let element): | |
return element | |
case .failure(let error): | |
throw error | |
} | |
} | |
.eraseToAnyPublisher() | |
// Cannot convert return expression of type 'AnyPublisher<T, Error>' to return type 'AnyPublisher<T, E>' | |
// 1. Arguments to generic parameter 'Failure' ('Error' and 'E') are expected to be equal | |
} | |
} | |
``` | |
Test: | |
```swift | |
enum MyErr: Error {} | |
let subject = PassthroughSubject<Result<Int, MyErr>, Never>() | |
subject.fromResult() | |
``` |
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