span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="expires_from_now/overload2.html" title="waitable_timer_service::expires_from_now (2 of 2 overloads)">expires_from_now</a><span class="special">(</span>
    <span class="identifier">implementation_type</span> <span class="special">&amp;</span> <span class="identifier">impl</span><span class="special">,</span>
    <span class="keyword">const</span> <span class="identifier">duration</sp