Hello I need to create a list of anonymous function literals

Question

Hello I need to create a list of anonymous function literals with receivers What I got is ``` private val fragmentInjectors = listOf lt Pair lt Class lt out Fragment gt Fragment gt Unit gt gt MainControlFragment class java to fun Fragment this as MainControlFragment viewModelFactory = mockViewModelFactory ``` but ideally I would like something like ``` private val fragmentInjectors = listOf lt Pair lt Class lt out Fragment gt Fragment gt Unit gt gt MainControlFragment class java to fun MainControlFragment this viewModelFactory = mockViewModelFactory ``` to avoid casting But unfortunately compiler complains about `type inference failed expected type mismatch` because of MainControlFragment and Fragment being different types Anyone knows the right syntax

Matej Drobnič · Answer

I guess you could create `BaseFragment` that has view model factory

Matej Drobnič · Answer

and then use that

Michal Klimczak · Answer

good idea thank you but at the end of the day I don t want to change the production code just to adjust for tests would rather have a clean kotlin syntax solution

wasyl · Answer

< Michal Klimczak> seems like I got it working with `in` variance on the second parameter Unfortunately `Pair` has `out` variance so I had to use own pair type ``` data class OwnPair lt A B gt val first A val second B private val fragmentInjectors = listOf lt OwnPair lt Class lt out Fragment gt in Fragment gt Unit gt gt OwnPair MainControlFragment class java fun MainControlFragment Can be different fragment types this viewModelFactory ```

Michal Klimczak · Answer

Seems great Will check soon

wasyl · Answer

But this does seem error prone you re allowed to have different fragment types for both parameters of the pair type Perhaps it would make sense to capture `Class lt T gt ` and `T gt Unit` parameters in own pair class in the first place

Michal Klimczak · Answer

yes but the original one has that issue too maybe this was the problem in the first place I will give it another spin

Michal Klimczak · Answer

cannot get it to work Created ```data class TypedBlock lt T gt val clazz Class lt T gt val block T gt Unit ``` I know the name is lame but w e and have something like ```listOf lt TypedBlock lt out Fragment gt gt TypedBlock MainControlFragment class java fun MainControlFragment viewModelFactory = controlFragmentViewModelFactory ``` But I need out variance in the `DispatchingAndroidInjector Factory newDispatchingAndroidInjector lt Fragment gt map ` ``` private fun createFakeFragmentsInjector fragmentInjectorBlocks List lt TypedBlock lt Fragment gt gt DispatchingAndroidInjector lt Fragment gt val map = fragmentInjectorBlocks map clazz block gt val injector = AndroidInjector lt Fragment gt instance gt if instance class java == clazz instance block clazz to AndroidInjector Factory lt Fragment gt injector map clazz factory gt clazz to Provider factory as Provider lt Factory lt out Fragment gt gt toMap toMutableMap return DispatchingAndroidInjector Factory newDispatchingAndroidInjector lt Fragment gt map ```