&&?.swift

class Bookmark {}
class WebView {}
class Something {}

var bookmark : Bookmark? = Bookmark()
var webview : WebView?  = WebView()
var something : Something? = nil


infix operator &&! {}

func &&! <LeftType, RightType> (lhs: LeftType?, rhs: RightType?) -> (LeftType, RightType)? {
    if let left: LeftType = lhs {
        if let right: RightType = rhs {
            return (left, right)
        }
    }
    return nil
}

if let (b, w) = bookmark &&! webview {
    println(true)
}
// -> true


if let (b, s) = bookmark &&! something {
    println(true)
} else {
    false
}
// -> false



infix operator &&? { associativity left }

func &&? <LeftType, RightType> (lhs: LeftType?, rhs: RightType?) -> Bool {
    if let left: LeftType = lhs {
        if let right: RightType = rhs {
            return true
        }
    }
    return false
}

func &&? <FirstType> (lhs: FirstType?, rhs: @autoclosure () -> Bool) -> Bool {
    if let left: FirstType = lhs {
        return rhs()
    }
    return false
}

bookmark &&? webview                // -> true
bookmark &&? something              // -> false
bookmark &&? webview &&? webview    // -> true
bookmark &&? webview &&? something  // -> false