Poor example but can i somehow use `this` reference in `lazy

Question

Poor example but can i somehow use `this` reference in `lazy ` scope for extension val Something like that ```val String something by lazy $this$this ```

iamthevoid · Answer

I understand that `this` in the case is outer scope

iamthevoid · Answer

but is there some chance to use inner scope using `by` keyword

iamthevoid · Answer

`this something` is not working

LeoColman · Answer

That would lead to some recursion issues wouldn t it

rtsketo · Answer

`something` isn t initilized to able to use it Maybe we can help if you are more specific of what you are trying to do

Youssef Shoaib [MOD] · Answer

Something like this should work <https play kotlinlang org 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|playground>

Youssef Shoaib [MOD] · Answer

```import kotlin reflect import kotlin properties private val stringSomethingMap MutableMap lt String Lazy lt String gt gt = java util IdentityHashMap val String something by thisDelegate lt String String gt stringSomethingMap getOrPut this lazy $this$this getValue this it fun main println test something interface ReadOnlyPropertyWithThis lt T V gt ReadOnlyProperty lt T V gt override fun getValue thisRef T property KProperty lt gt V = thisRef getValueWithThis property fun T getValueWithThis property KProperty lt gt V interface ReadWritePropertyWithThis lt T V gt ReadOnlyPropertyWithThis lt T V gt ReadWriteProperty lt T V gt override fun getValue thisRef T property KProperty lt gt V = super lt ReadOnlyPropertyWithThis gt getValue thisRef property override fun setValue thisRef T property KProperty lt gt value V = thisRef setValueWithThis property value fun T setValueWithThis property KProperty lt gt value V inline fun lt T V gt thisDelegate crossinline getValue T prop KProperty lt gt gt V ReadOnlyPropertyWithThis lt T V gt = object ReadOnlyPropertyWithThis lt T V gt override fun T getValueWithThis property KProperty lt gt V = getValue property inline fun lt T V gt thisDelegate crossinline getValue T prop KProperty lt gt gt V crossinline setValue T prop KProperty lt gt value V gt Unit ReadWritePropertyWithThis lt T V gt = object ReadWritePropertyWithThis lt T V gt override fun T getValueWithThis property KProperty lt gt V = getValue property override fun T setValueWithThis property KProperty lt gt value V = setValue property value Or just make your life easier with this object DoubleString operator fun getValue thisRef String prop KProperty lt gt = $thisRef$thisRef ```

Youssef Shoaib [MOD] · Answer

The issue is that it is up to the delegate to pass you the `thisRef` or not and for `lazy` it doesn t make sense because it only gets computed once This does the trick because it makes a lazy instance for each unique string that passes through it