Ilya Chernikov
38 lines
1.1 KiB
Kotlin
Vendored
38 lines
1.1 KiB
Kotlin
Vendored
// FIR_IDENTICAL
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// !LANGUAGE: +NewInference
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// !DIAGNOSTICS: -UNUSED_PARAMETER -UNUSED_VARIABLE
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// Generic interface, nothing interesting here
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interface UseCase<in I, out O> {
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fun execute(input: I): O
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}
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// We don't want to call use cases without input with explicit Unit argument, so we create this handy extension
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fun <O> UseCase<Unit, O>.execute(): O = execute(Unit)
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class Foo : UseCase<Unit, List<List<List<String>>>> {
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override fun execute(input: Unit) = listOf(listOf(listOf("foo")))
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}
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class Bar : UseCase<Unit, List<List<String>>> {
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override fun execute(input: Unit) = listOf(listOf("bar"))
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}
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class Baz : UseCase<Unit, List<List<List<List<List<List<String>>>>>>> {
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override fun execute(input: Unit) = listOf(listOf(listOf(listOf(listOf(listOf("foo"))))))
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}
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fun main() {
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val foo = Foo()
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foo.execute(Unit) // Member: OK both versions
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foo.execute() // Extension: OI - OK, NI - was error: "Not enough information to infer type variable O"
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val bar = Bar()
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bar.execute(Unit) // Member: OK both versions
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bar.execute() // Extension: OK both versions
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val baz = Baz()
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baz.execute(Unit)
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baz.execute()
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}
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