/**
 * We declare a package-level function main which returns Unit and takes
 * an Array of strings as a parameter. Note that semicolons are optional.
 */

fun main(args: Array<String>) {
    println("Hello, world!")
    funLiteral( {x,y ->
        a() // 可以调用Test里的方法
        println("This is func varieble")
        b()
    })
    println(sum(1, 2))
}

fun funLiteral(func: Test.(x: Int , y: Int) -> Unit) {
    val tmp = Test()
    tmp.func(1, 2) // 相当于给Test增加了实例方法func
}

class Test {
    fun a() {
        println("This is func a")
    }

     fun b() {
        println("This is func b")
    }
}