How to get the name of a variable in Kotlin?

I have a Kotlin class in my application with a lot of attributes, what I want to build is a method that stores the variable name in a dictionary. The dictionary looks like this:

HashMap<String, Pair<Any, Any>>()

The purpose of this is to store the changes made to a certain attribute, I store the name of the variable as the key and in the Pair I store the old value and the new value. To notify a change I use the Observer pattern. So whenever a setter is called from an attribute a change will be notified and stored to the dictionary.

The code below results in the folowing:

var person = Person("Harry", 44)
person.age = 45

HashMap("age", (44, 45))

Right now I am just hardcoding the variable name in as a String, so my question is:

How to dynamicly get the name of a variable in Kotlin?

I saw the same question in Java: Java Reflection: How to get the name of a variable?

Also some other questions about the same topic claiming it is not possible: Get the name property of a variable

I can understand that it is not possible to get the name of a variable, because the compiler simple doesn't have that information, but I am still currious to see if others have any sollution for this problem.

I think delegate properties is the solution to my problem:

class Delegate {
operator fun getValue(thisRef: Any?, property: KProperty<*>): String {
    return "$thisRef, thank you for delegating '${property.name}' to me!"
}

operator fun setValue(thisRef: Any?, property: KProperty<*>, value: String) {
    println("$value has been assigned to '${property.name}' in $thisRef.")
  }
}

Credits go to: Roland
Source: https://kotlinlang.org/docs/reference/delegated-properties.html