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kotlinlang

hi all, i have a question about delegation or something like that:

```
data class UserWrapper(private val user: User, val transactionId: String) {
    fun userId(): Long {
        return user.userId
    }

    fun email(): String {
        return user.email
    }

    fun userName(): String {
        return user.username
    }
}
```
it’s a simple data class that wraps another one, and to avoiding access to properties multiply times, i decide to use proxy methods, maybe kotlin has more “sugar” way to do it, please help )