Found this ticket but wonder if there s any other way to ach kotlinlang #announcements

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Title

k

Kirill Zhukov

05/01/2019, 8:01 PM

Found this ticket but wonder if there’s any other way to achieve the same result? https://youtrack.jetbrains.com/issue/KT-28298

s

Shawn

05/01/2019, 8:02 PM

is there a reason you can’t use a simple

if (obj is SomeType)

?

I’m not sure how this extension function would be used

k

Kirill Zhukov

05/01/2019, 9:11 PM

This is to add smart cast support when doing assertions

If I have something like this:

interface Foo

object Bar : Foo {
  val name: String = "bar"
}

I want to be able to safely do assertion like this:

val foo: Foo = Bar
assertThat(foo).isInstanceOf<Bar>()
assertThat(foo.name).isEqualTo("bar")

similar to:

if (foo is Bar) {
  assertThat(foo.name).isEqualTo("bar")
}

but with instance assertion

while taking advantage of defined contract

s

Shawn

05/01/2019, 9:15 PM

interesting… I can’t help but wonder if this is a problem with the test or method in question rather than the lack of a given assertion mechanism

are you checking for a specific implementation of something?

like the compiler should already verify a return type, unless, I guess, the return type of a given method is

or

Any

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