Function async_wait_twice

example/cpp14/deferred/deferred_3.cpp:17–31

template <typename CompletionToken>
auto async_wait_twice(boost::asio::steady_timer& timer, CompletionToken&& token)
{
  return timer.async_wait(
      deferred(
        [&](boost::system::error_code ec)
        {
          std::cout << "first timer wait finished: " << ec.message() << "\n";
          timer.expires_after(std::chrono::seconds(1));
          return timer.async_wait(deferred);
        }
      )
    )(
      std::forward<CompletionToken>(token)
    );
}

int main()
{