dentifier">size_t</span> <a class="link" href="expires_from_now/overload3.html" title="basic_deadline_timer::expires_from_now (3 of 3 overloads)">expires_from_now</a><span class="special">(</span>
    <span class="keyword">const</span> <span class="identifier">duration_type</span> <span class="special">&amp;</span> <span class="identifier">expiry_time</span><span class="special">,</span>
    <span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class