J_Strauton :
I have a default function like this:
fun <T> makeDefault(): Animal<T> = Animal<Nothing>(
name = "",
size = 0,
age = 0
)
I saw that there is the by operator, which can be used for view models like this:
val model: MyViewModel by viewModels()
Question: How I can create a function that behaves like that for my makeDefault()?
What I want to do:
val animal: Animal<Dog> by makeDefault()
S-Sh :
You can create your own Delegate, not extension:
import kotlin.reflect.KProperty
class DefaultDelegate<T> {
private var created: Animal<T> = Animal<Nothing>(
name = "",
size = 0,
age = 0
)
operator fun getValue(thisRef: Any?, property: KProperty<*>): Animal<T> {
return created
}
operator fun setValue(thisRef: Any?, property: KProperty<*>, value: Animal<T>) {
created = value
}
}
Then use it:
val animal: Animal<Dog> by DefaultDelegate()
For more information, see Delegated properties doc
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