word">friend</span> <span class="keyword">bool</span> <span class="keyword">operator</span><span class="special">!=(</span>
    <span class="keyword">const</span> <span class="identifier">udp</span> <span class="special">&amp;</span> <span class="identifier">p1</span><span class="special">,</span>
    <span class="keyword">const</span> <span class="identifier">udp</span> <span class="special">&amp;</span> <span class="identifier">p2</span><span class="special">);</span>
</pre>
<h6>
<a name="boost_asio.refer