Is it possible to write a helper providing common ...

# getting-started

[David Kubecka]

Is it possible to write a helper providing common contexts, e.g. for testing? I was thinking about something like this but was not able to use it properly:

fun withTestContext(block: context(Context1, Context2) () -> Unit) =
  block(TEST_CONTEXT_1, TEST_CONTEXT_2)

context(Context1, Context2)
fun myFun() {}

fun myTest() = withTestContext {
  myFun(..., ...) // how to access the corresponding contexts here?
}

[Youssef Shoaib [MOD]]

context(A) fun <A> given(): A = this@A

[David Kubecka]

That works quite well, although the compiler is unable to infer the types so I have to do

myFun(given<Context1>(), given<Context2>())

I hope this will be improved in the next iterations of context parameters.

[David Kubecka]

Moreover, Intellij marks the explicit types as redundant 🤷

[ephemient]

does this@Context1, this@Context2 not work?

[ephemient]

although it's changing with the upcoming https://github.com/Kotlin/KEEP/blob/context-parameters/proposals/context-parameters.md anyway

[David Kubecka]

does this@Context1, this@Context2 not work

No, but that's probably what I would expect.