count

abstract fun count(): Kind<F, Long>

Get a snapshot of the current count, may be negative. The count is current available permits minus the outstanding acquires.

import arrow.fx.*
import arrow.fx.extensions.io.async.async
import arrow.fx.extensions.io.monad.flatMap

fun main(args: Array<String>) {
  //sampleStart
  val semaphore = Semaphore.uncancellable<ForIO>(5, IO.async())

  val result = semaphore.flatMap { s ->
    s.count()
  }
  //sampleEnd
  println(result)
}