I know it is possible to pass class type to a function in swift:
func setGeneric<T>(type: T.Type){ }
setGeneric(Int.self)
But how we can return type from function? Writing something like
func getGeneric<T>() -> T.Type {
return Int.self
}
gives compiler error "Int is not identical to T". So is it possible to return type from a swift function?
Edit
Some explanation. I have classes that are used for persistence (I'm using Realm) and I have classes that acts as wrappers around this classes. All wrappers inherits from RealmClassWrapper
which needs to know what Realm class it actually wraps. So lets say I have this realm model:
class RealmTodo: RLMObject {
dynamic var title = ""
}
and my wrappers supper class looks like this:
class RealmClassWrapper {
private let backingModel: RLMObject
//...
func backingModelType<T>() -> T.Type{ fatalError("must be implemented") }
}
and actual wrapper:
class Todo: RealmClassWrapper {
//some other properties
func backingModelType<T>() -> T.Type{ return RealmTodo.self }
}
You can return any type you want.
func getTypeOfInt() -> Int.Type { return Int.self }
func getTypeOfBool() -> Bool.Type { return Bool.self }
If the type is not determined from arguments or if the return is constant, there is no need to introduce a generic T
type.
It works when I modify your function like this:
func getGeneric<T>(object: T) -> T.Type {
return T.self
}
getGeneric(0) // Swift.Int
You can force the downcast (as!) as below
func getGeneric<T>() -> T.Type {
return Int.self as! T.Type
}
But out of the function scope, you need to indicate the returned type:
var t:Int.Type = getGeneric()
Yes, this is possible. The problem here is that you say your function returns a generic T.type
, but you always return Int.type
. Since T is not always an Int, the compiler raises an error.
If you don't want to specify the return type you can use AnyClass as it instead of a template parameter.
class A {}
class B {}
public enum ExampleEnum: String {
case a
case b
func asClass() -> AnyClass {
switch self {
case .a:
return A.self
case .b:
return B.self
}
}
}
let myGoal : AnyClass = ExampleEnum.a.asClass()
You can also avoid the final cast to AnyClass, but compiler will show you an error
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