What is the difference between
inline fun <reified T> T.TAG(): String = T::class.java.simpleName
and
fun Any.TAG(): String = this::class.java.simpleName
is there any difference between using generic and Any as function parameter or as extended function class name?
There is a difference.
inline fun <reified T> T.TAG1(): String = T::class.java.simpleName
fun Any.TAG2(): String = this::class.java.simpleName
TAG1 would get the compile-time type as the type of T is determined at compile time, and TAG2 would get the runtime type. this::class is similar to this.getClass() in Java.
For example:
val x: Any = "Foo"
x.TAG1() would give you Any::class.java.simpleName, and x.TAG2() would give you String::class.java.simpleName.