:</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">multicast</span><span class="special">::</span><span class="identifier">leave_group</span> <span class="identifier">option</span><span class="special">(</span><span class="identifier">multicast_address</span><span class="special">);</span>
<span class="identifier">socket</span><span class="special">.</span><span class="identifier">set_option</sp