ExecuteUnsafe.scala

import scala.concurrent.Future

/** Typeclass for interoperating with legacy code which uses Scala futures. */
trait ExecuteUnsafe[F[_]] {

  def unsafeToFuture[T](mt: F[T]): Future[T]

}

object ExecuteUnsafe {

  def apply[F[_]: ExecuteUnsafe]: ExecuteUnsafe[F] =
    implicitly[ExecuteUnsafe[F]]

  implicit val future: ExecuteUnsafe[Future] = FutureExecuteUnsafe

  private object FutureExecuteUnsafe extends ExecuteUnsafe[Future] {
    override def unsafeToFuture[T](future: Future[T]): Future[T] = future
  }

}