I have 2 methods ```fun <ACTUAL> expect( a...

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[robfletcher]

I have 2 methods

fun <ACTUAL> expect(
  actual: ACTUAL,
  block: ObjectAssert<ACTUAL>.(ACTUAL) -> Unit
): ObjectAssert<ACTUAL>

and

fun <ELEMENT> expect(
  actual: List<ELEMENT>,
  block: SoftAssertionListAssert<ELEMENT>.(List<ELEMENT>) -> Unit
): SoftAssertionListAssert<ELEMENT>

that the compiler is unable to distinguish between at the call site. I get why that’s an issue but confusingly I have overloads of both that only accept the first parameter:

fun <ACTUAL> expect(actual: ACTUAL): AbstractObjectAssert<*, ACTUAL>

and

fun <ELEMENT> expect(actual: List<ELEMENT>): ListAssert<ELEMENT>

that the compiler can distinguish. Can anyone enlighten me as to why one is a problem and no the other? Is there any way I can disambiguate the 2 param form?

[karelpeeters]

Is there an inheritance relation between SoftAssertionListAssert and ObjectAssert?

[Andreas Sinz]

@robfletcher can you give us an example how you try to invoke expect?

[robfletcher]

I was wondering about the inheritance relationship but no there is not.

[robfletcher]

Those are classes from AssertJ. I’m working on some Kotlin extensions for it.

[robfletcher]

The only solution I’ve found so far is to add a 2nd generic parameter to the list version but even then I have to specify the generic type at the call site

[Andreas Sinz]

@robfletcher do you pass a lambda as the second parameter?

[robfletcher]

yes

[robfletcher]

I can get it to work by declaring the lambda as a variable with a specified type. That’s not ideal as I’m trying to create a reasonable test DSL. I’ll have to see if there’s another way I can disambiguate things

[Andreas Sinz]

@robfletcher the problem is, that the kotlin-compiler needs to know the inputs/outputs of a lambda before it checks the body of the lambda. Thats why declaring the lambda before works. I don't really see a way around that apart from renaming one of the methods

[robfletcher]

yeah, it makes sense

[robfletcher]

thanks for the help