SetupResult

public enum SetupResult<T> : Hashable where T : StorageInterface

The SetupResult indicates the result of an asynchronous initialization of a persistent store. The SetupResult can be treated as a boolean:

try! CoreStore.addStorage(
    SQLiteStore(),
    completion: { (result: SetupResult) -> Void in
        if result {
            // succeeded
        }
        else {
            // failed
        }
    }
)

or as an enum, where the resulting associated object can also be inspected:

try! CoreStore.addStorage(
    SQLiteStore(),
    completion: { (result: SetupResult) -> Void in
        switch result {
        case .success(let storage):
            // storage is the related StorageInterface instance
        case .failure(let error):
            // error is the CoreStoreError enum value for the failure
        }
    }
)