Informer.kt

data class Informer<T : Resource>(val blah : Int = 1) {

    private var started = false

    fun start(): Boolean {
        if (!started) {
            this.started = true
            return true
        } else {
            return false
        }
    }

    fun start2(): Boolean {
        return if (this.started) false else run {
            this.started = true
            true
        }
    }

    fun start3(): Boolean = if (this.started) false else run {
        this.started = true
        true
    }
}

fun start4(): Boolean = (!started).also { if (!started) started = true }