pecial">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> <span class="identifier">ec</span><span class="special">);</span>
</pre>
<p>
            This function is used to close the handle. Any asynchronous read or write
            operations will be cancelled immediately, and will complete with the
            <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</sp