@Observable seems not to work well with generic typed throw.
The following code using @Observable with non-generic typed throw builds good:
@Observable
class ThrowsLoadingViewModel<R, E: Error> {
private(set) var isLoading = true
private(set) var error: E? = nil
private(set) var data: R? = nil
private var task: () throws(Error) -> R
init(task: @escaping () throws(E) -> R) {
self.task = task
}
func load() {
do throws(Error) {
self.data = try task()
} catch {
// self.error = error
}
self.isLoading = false
}
}
But if I change Line 7 and 14 to generic, it'll breaks the build with a "Command SwiftCompile failed with a nonzero exit code" message :
@Observable
class ThrowsLoadingViewModel<R, E: Error> {
private(set) var isLoading = true
private(set) var error: E? = nil
private(set) var data: R? = nil
private var task: () throws(E) -> R
init(task: @escaping () throws(E) -> R) {
self.task = task
}
func load() {
do throws(E) {
self.data = try task()
} catch {
// self.error = error
}
self.isLoading = false
}
}
A the same time, if I remove @Observable, the generic typed throw works again:
class ThrowsLoadingViewModel<R, E: Error> {
private(set) var isLoading = true
private(set) var error: E? = nil
private(set) var data: R? = nil
private var task: () throws(E) -> R
init(task: @escaping () throws(E) -> R) {
self.task = task
}
func load() {
do throws(E) {
self.data = try task()
} catch {
// self.error = error
}
self.isLoading = false
}
}
Currently the possible solution seems to fall back to use ObservableObject...
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