@propertyWrapper
struct Clamped<T: Comparable> {

    var wrappedValue: T {
        didSet {
            wrappedValue = Self.value(wrappedValue, clampedTo: range)
        }
    }

    private let range: ClosedRange<T>

    init(wrappedValue: T, _ range: ClosedRange<T>) {
        self.wrappedValue = Self.value(wrappedValue, clampedTo: range)
        self.range = range
    }

    private static func value(_ value: T, clampedTo range: ClosedRange<T>) -> T {
        min(max(value, range.lowerBound), range.upperBound)
    }
}

struct Movie {
    @Clamped(0...10) var rating: Double = 0
}

let pulpFiction = Movie(rating: 9999)
print(pulpFiction.rating) // sadly only prints 10 :-(