n> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">);</span>
    <span class="identifier">socket</span><span class="special">.</span><span class="identifier">open</span><span class="special">(</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">v4</span><span class="special">());</span>

    <span class="identifier">boost</span><span class="special">::</span><span class="identifie