Hi guys I have a such interface ```interface Requ...

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[Eugene Freeman]

Hi guys

I have a such interface

interface RequestsExecutor : Closeable {
    suspend fun <T : Any> execute(request: Request<T>): T
}

Is possible to implement ConstantRequestsExecutor to satisfy the interface and use T parameter on the class level? Thanks

class ConstantRequestsExecutor<T : Any> (
        private val responseValue: T
) : RequestsExecutor {
    override fun close() {
    }

    override suspend fun execute(request: Request<T>): T {
        return responseValue
    }
}

[Shawn]

Is possible to implement ConstantRequestsExecutor  to satisfy the interface and use T parameter on the class level?

no

[Shawn]

not as currently defined

[Shawn]

if you do not control this interface, then you cannot do what you’re trying to do

[Shawn]

a ConstantRequestsExecutor<Foo> would present a fun execute(Request<Foo>) which would not satisfy the same contract as the one declared RequestsExecutor, which has an execute method that takes Request<T> and T is only declared to be bound by Any at the call site

[Shawn]

that method as defined on the interface is required to be able to take a Request<Bar>, a Request<Baz>, etc on any instance — if the interface were changed to RequestsExecutor<T> then you’d be able to use the class-level parameter

[Eugene Freeman]

Yeah make sense, thanks