guaranteed to return at least one endpoint in the list if it
        does not fail. This means it is safe to dereference the return value directly.
      </p>
<pre class="programlisting">    <span class="identifier">udp</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">receiver_endpoint</span> <span class="special">=</span> <span class="special">*</span><span class="identifier">resolver</span><span class="special">.</span><span class="identifier">resolve<