attr val example

gistfile1.kt

class B {
    val attr = Attr()
    class Attr {
        var name: String = ""
        var width: Int = 0
        fun invoke(f: Attr.() -> Unit) {
            this.f()
        }
    }
}

fun main(args: Array<String>) {
    with(B()) {
        attr.name = "43"
        attr {
            name = "35"
            width = 2
        }
    }
}