Function Spawn

cpp/src/arrow/util/thread_pool.h:84–87

  // Spawn a fire-and-forget task.
  template <typename Function>
  Status Spawn(Function&& func) {
    return SpawnReal(TaskHints{}, std::forward<Function>(func), StopToken::Unstoppable(),
                     StopCallback{});
  }
  template <typename Function>
  Status Spawn(Function&& func, StopToken stop_token) {
    return SpawnReal(TaskHints{}, std::forward<Function>(func), std::move(stop_token),