dt><span class="term">handler</span></dt>
<dd>
<p>
                  The handler to be called when the receive operation completes.
                  Copies will be made of the handler as required. The function signature
                  of the handler must be:
</p>
<pre class="programlisting">void handler(
  const boost::system::error_code&amp; error, // Result of operation.
  std::size_t bytes_transferred           // Number of bytes received.
);
</pre>
<p>
                  Regardless of whether the asy