template <class F, class... Args>
auto ThreadPool::Enqueue(F &&f, Args &&...args) -> std::future<typename std::result_of<F(Args...)>::type> {
  using return_type = typename std::result_of<F(Args...)>::type;
  auto task =
      std::make_shared<std::packaged_task<return_type()>>(std::bind(std::forward<F>(f), std::forward<Args>(args)...));


模板+变长参数+异步+右值引用+转发+智能推导。。。
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