code>, <code class="computeroutput"><span class="identifier">b</span></code>
        and <code class="computeroutput"><span class="identifier">c</span></code> denote values of type
        <code class="computeroutput"><span class="identifier">X</span><span class="special">::</span><span class="identifier">implementation_type</span></code>, and <code class="computeroutput"><span class="identifier">u</span></code> denotes an identifier.
      </p>
<div class="table">
<a name="boost_asio.reference.IoObjectServ