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import UIKit

extension UIViewController {
    struct Holder {
        static var _myComputedProperty:Bool = false
    }
    var myComputedProperty:Bool {
        get {
            return Holder._myComputedProperty
        }
        set(newValue) {
            Holder._myComputedProperty = newValue
        }
    }
}

extension UIViewController {
    private struct Holder {
        static var _myComputedProperty = [String:Bool]()
    }
    
    var myComputedProperty:Bool {
        get {
            return Holder._myComputedProperty[self.debugDescription] ?? false
        }
        set(newValue) {
            Holder._myComputedProperty[self.debugDescription] = newValue
        }
    }
}

extension UIViewController {
    private static var _myComputedProperty = [String:Bool]()
    
    var myComputedProperty:Bool {
        get {
            let tmpAddress = String(format: "%p", unsafeBitCast(self, to: Int.self))
            return UIViewController._myComputedProperty[tmpAddress] ?? false
        }
        set(newValue) {
            let tmpAddress = String(format: "%p", unsafeBitCast(self, to: Int.self))
            UIViewController._myComputedProperty[tmpAddress] = newValue
        }
    }
}