res_from_now()</code> functions
            must be called to set an expiry time before the timer can be waited on.
          </p>
<h6>
<a name="boost_asio.reference.basic_deadline_timer.basic_deadline_timer.overload1.h0"></a>
            <span class="phrase"><a name="boost_asio.reference.basic_deadline_timer.basic_deadline_timer.overload1.parameters"></a></span><a class="link" href="overload1.html#boost_asio.reference.basic_deadline_timer.basic_deadline_timer.overload1.parameters">Parameters</a>
          