How do I constrain a Kotlin extension function parameter to be the same as the extended type?

Question

I want to write an extension method on a generic type T, where the matched type constrains a method parameter.

I want this to compile:

\"Hello\".thin         


        

Answer 1

As far as I know, this is not possible in Kotlin 1.0. There are several issues in the tracker (first, second) about a similar use case, and the solution proposed in the first one is likely going to help here in the future as well.