Are there any shortcuts for exposing only specific...

# getting-started

[DamianReeves]

Are there any shortcuts for exposing only specific methods and properties of a value class? It gets a bit tedious threading through the calls to underlying methods

[Javier]

I am not following you. Is any visibility modifier not enough?

private, etc

[DamianReeves]

I am talking about exposing the functions and properties of the underlying type of an inline value class.
Currently to expose the methods I want I need to write the same signature and pass it through to call the wrapped type.

[CLOVIS]

The point of a value class is to be a different type with a clean API, so no, not by default.

However, if what you want to expose behavior from an interface , there is delegation:

value class Username(
    private val value: Whatever,
) : Foo by value

[CLOVIS]

If you want to automatically have access to all functionality of the underlying type, use typealias instead

[DamianReeves]

Does that mean it will delegate all the declarations in Foo fulfilled by value?

[Javier]

Wouldn't break this boxing?

[DamianReeves]

Perhaps… but actually Delegation is apparently something I missed in my read trough of the docs and this seems like what I want (though to your point I may promote my value class to a data class in)

[CLOVIS]

yes

For boxing: depends on how you're using. If you use the object directly, it shouldn't. If you upcast to the interface, then yeah.