Method cancel_one

include/boost/asio/basic_waitable_timer.hpp:440–447

Cancels one asynchronous operation that is waiting on the timer. * This function forces the completion of one pending asynchronous wait * operation against the timer. Handlers are cancelled in FIFO order. The * handler for the cancelled operation will be invoked with the * boost::asio::error::operation_aborted error code. * * Cancelling the timer does not change the expiry time.

   * error code that indicates the successful completion of the wait operation.
   */
  std::size_t cancel_one()
  {
    boost::system::error_code ec;
    std::size_t s = impl_.get_service().cancel_one(
        impl_.get_implementation(), ec);
    boost::asio::detail::throw_error(ec, "cancel_one");
    return s;
  }

  /// Get the timer's expiry time as an absolute time.
  /**