I've found a way to keep using `ResultWrapper<o...

# announcements

[Joan Colmenero]

I've found a way to keep using ResultWrapper<out T> but I'm curious now how to implement Either on the execute method.

I found a way like
data class Success<out T : Any>(val value: T) : ResultWrapper<T>()

[karelpeeters]

I'm not 100% sure what your question is but you might want to use Either<Nothing, R> which is a subtype of any Either<T, R>.

[Joan Colmenero]

I want to change this :

inline fun <reified T : Any> execute(requestFunc: () -> T): ResultWrapper<T> =
        try {
            ResultWrapper.Success(requestFunc.invoke())
        } catch (exception: Exception) {
            when (exception) {
                is UnauthorizedException -> ResultWrapper.Unauthorized(exception)
                is NetworkException -> ResultWrapper.Network(exception)
                is BadRequestException -> ResultWrapper.BadRequest(exception)
                is NotFoundException -> ResultWrapper.NotFound(exception)
                else -> ResultWrapper.Error(exception)
            }
        }

But with my new sealed class Either

[karelpeeters]

And what do you want the error type to be? Just Exception?

[karelpeeters]

(FYI: Either where one of the cases is an error often has a special type Try instead)

[Joan Colmenero]

Don't get you what you said in the last answer

[Joan Colmenero]

Yes, or just a sealed class with all the errors

[Joan Colmenero]

All extends Exception though

[karelpeeters]

Simplified code:

sealed class Either<out L, out R> {
    class Left<out L>(val left: L): Either<L, Nothing>()
    class Right<out R>(val right: R): Either<Nothing, R>()
}

inline fun <reified T : Any> execute(requestFunc: () -> T): Either<T, Exception> =
        try {
            Either.Left(requestFunc.invoke())
        } catch (exception: Exception) {
            Either.Right(exception)
        }

[karelpeeters]

What I meant with my FYI is that people/libraries usually call Either<T, Exception> Try<T> instead, it's often either a typedef or a separate class.

[Joan Colmenero]

Like my WrapperResponse<T>

[Joan Colmenero]

right?

[karelpeeters]

Heh yeah basically, we're running in circles 🙂

[Joan Colmenero]

But the thing is that I can not do like a fold

[Joan Colmenero]

having the exception and the T

[Joan Colmenero]

I have to do it with a when