Kotlin `this` 表达式
Tags: Kotlin
Kotlin 提供了一个 this
表达式,主要就是一个带标签的 this
,用于在内部类、扩展中获取正确的类对象实例。
class A { // implicit label @A
inner class B { // implicit label @B
fun Int.foo() { // implicit label @foo
val a = this@A // A's this
val b = this@B // B's this
val c = this // foo()'s receiver, an Int
val c1 = this@foo // foo()'s receiver, an Int
val funLit = [email protected] fun String.() {
val d = this // funLit's receiver
}
val funLit2 = { s: String ->
// foo()'s receiver, since enclosing lambda expression
// doesn't have any receiver
val d1 = this
}
}
}
}