n><span class="special">;</span>
    <span class="identifier">udp</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">sender_endpoint</span><span class="special">;</span>
    <span class="identifier">size_t</span> <span class="identifier">len</span> <span class="special">=</span> <span class="identifier">socket</span><span class="special">.</span><span class="identifier">receive_from</span><span class="special">(</span>
        <span class="identifier">boos