Good day, I'm trying to delegate `toString()`, `equals()` and `hashCode()` implementations to anothe...

# getting-started

[Kien Vu]

Good day,
I'm trying to delegate toString(), equals() and hashCode() implementations to another object, so I'm delegating Any like below, is this the right way to do?

interface A
class B: A {
  override fun toString() = "This is C..."
  override fun equals(...) = ...
  override fun hashCode() = ...
}
class C(delegated: B): A by delegated, Any by delegated {
  // toString(), equals() and hashCode() get `delegated to delegated`?
}

Edit: I'm getting the error: [DELEGATION_NOT_TO_INTERFACE] Only interfaces can be delegated to

[Kien Vu]

Since Any is not an interface, my current only solution is:

class C(delegated: B): A by delegated {
    override fun toString(): String = delegated.toString()
    override fun equals(other: Any?): Boolean = delegated == other
    override fun hashCode(): Int = delegated.hashCode()
}

[CLOVIS]

Your second message is correct, it's not possible to automatically delegate toString/equals/hashCode