fakeLazy.swift

struct Foo {
    var fakeLazy: Int {
        mutating get {
            if let value = _fakeLazy { return value }
            let value = calculateLazyValue()
            _fakeLazy = value
            return value
        }
        set {
            _fakeLazy = newValue
        }
    }
    private var _fakeLazy: Int?

    private func calculateLazyValue() -> Int {
        return 42
    }
}