"this@" syntax for extension function

Question

I'm trying to figure out how to refer to this inside of a with block.

inline fun A.foo(bar: B, crossinline block: B.() -> Unit) {
    with (bar) {
        [email protected]() // compile error, "unresolved reference @A"
        block()
    }
}

Here is my workaround:

inline fun A.foo(bar: B, crossinline block: B.() -> Unit) {
    val self = this
    with (bar) {
        self.doSomething() // okay, but ugly
        block()
    }
}

Is there a better way, and why doesn't this work?

Answer 1

i try the code

you can use this@foo to access A,or use let instead

inline fun Activity.foo(bar: Fragment) {
    bar.let {
        this.xxx
    }
}