Coroutine equivalent of Thread.currentThread() requires a !! cast

[qwwdfsad]

The closest equivalent to the JVM's Thread.currentThread() for coroutines is

coroutineContext[Job]!!

This !! cast always succeeds, but it draws the developer's attention and brings in uncertainty about the correctness of the code. Here's an example where this concern was raised on Stack Overflow.

Kotlin could provide a function that hides this check, for example:

suspend fun currentJob(): Job = coroutineContext[Job]!!

Originally reported here

[qwwdfsad]

This has the same problem as cancel() and isActive: once we have a suspending variant, it's also convenient to provide extension on CoroutineScope and that's where things go wild:

runBlocking {
    flow {
        currentJob() // <- resolves into extension on `runBlocking` instead of suspending variant
    }.collect().launchIn(Job())

}

[recheej]

@qwwdfsad I think to avoid confusion/conflicts, the CoroutineScope extension currentJob() will need to be a different name than the suspending version. How about currentScopeJob()?