Kotlin Higher Order Contexts

interface MyContext {
    fun boom()
}

// You can specify and bind the context explicitly...
context(MyContext)
fun contextualizedHigherOrderFunction1(f: MyContext.() -> Unit) {
    // see https://github.com/Kotlin/KEEP/blob/master/proposals/context-receivers.md#referencing-specific-receiver
    [email protected]()
}

// ... or not!
fun contextualizedHigherOrderFunction2(f: () -> Unit) {
    f()
}

context(MyContext)
fun thingy() {
    boom()
}

fun main() {
    val myContext = object : MyContext {
        override fun boom() {
            println("boom")
        }
    }
    with(myContext) {
        contextualizedHigherOrderFunction1 { thingy() }
        contextualizedHigherOrderFunction2 { thingy() }
        println("out go the lights")
    }
}

You can specify the context receiver of a higher order function, or not!