@propertyWrapper
struct Expirable<Value> {
let duration: TimeInterval
var expirationDate: Date = Date()
private var innerValue: Value?
var value: Value? {
get{ return hasExpired() ? nil: innerValue }
set{
self.expirationDate = Date().addingTimeInterval(duration)
self.innerValue = newValue
}
}
init(duration: TimeInterval) {
self.duration = duration
}
private func hasExpired() -> Bool {
return expirationDate < Date()
}
}
struct Tokens {
@Expirable(duration: 3) static var authent: String
}
Tokens.authent = NSUUID().uuidString
sleep(2)
Tokens.authent ?? "token has expired"
sleep(2)
Tokens.authent ?? "token has expired"
