I want my equals to compare class too and I wrote
override fun equals(other: Any?): Boolean {
return this::class == other::class && ...
}
unfortunately it swears
Expression in a class literal has a nullable type 'Any?', use !! to make the type non-nullable
But I want to compare with nulls too. What about glorious "null safety"? They forgot it for reflection? I didn't find ?:: operator or something.
Think about this. The class is actually not different between a String and a String?, it's only the type that differs. You cannot invoke that operator on nullable types since it could mean you invoke it on null which would lead to a NullPointerException:
val x: String? = null
x!!::class //throws NPE
With the help of the scope function let you can ensure it isn't null and use the class literal syntax:
return other?.let { this::class == other::class } ?: false
The Elvis operator ?: is used to handle the null case by making the expression false (not equal).
