Delegates.observable追踪观察可变数据更新，Kotlin

 

import kotlin.properties.Delegates
import kotlin.reflect.KPropertyclass Person {var name: String by Delegates.observable("fly") { prop: KProperty<*>, old: String, new: String ->println("$old -> $new")}
}fun main() {val p = Person()p.name = "phil"
}

 

fly -> phil

 

 

 

 

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