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Constructor.
basic_waitable_timer(
    boost::asio::io_context & io_context);
            This constructor creates a timer without setting an expiry time. The
            expires_at() or expires_after() functions must
            be called to set an expiry time before the timer can be waited on.
          
                  The io_context
                  object that the timer will use to dispatch handlers for any asynchronous
                  operations performed on the timer.