Bool.swift

public extension Bool {
    func `if`<T>(true truth: @autoclosure () -> T, false falsity: @autoclosure () -> T) -> T {
        switch self {
        case true:
            return truth()
        case false:
            return falsity()
        }
    }

    func `if`<T>(true value: @autoclosure () -> T?) -> T? {
        switch self {
        case true:
            return value()
        case false:
            return nil
        }
    }

    func `if`<T>(false value: @autoclosure () -> T?) -> T? {
        switch self {
        case true:
            return nil
        case false:
            return value()
        }
    }
}