```object counter { private var counter : Int ...

# announcements

[hasen]

object counter {
    private var counter : Int = 0
    fun increment() {
        mutext.lock()
        counter++
        mutext.unlock()
    }
    fun decrement() {
        mutext.lock()
        counter--
        mutext.unlock()
    }
    fun get() = counter
    fun isZero() = counter == 0
}