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  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_asio.reference.ip__multicast__enable_loopback"></a><a class="link" href="ip__multicast__enable_loopback.html" title="ip::multicast::enable_loopback">ip::multicast::enable_loopback</a>
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  29 <p>
  30         <a class="indexterm" name="idp151058608"></a>
  31 Socket option determining whether outgoing
  32         multicast packets will be received on the same socket if it is a member of
  33         the multicast group.
  34       </p>
  35 <pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">implementation_defined</span> <span class="identifier">enable_loopback</span><span class="special">;</span>
  36 </pre>
  37 <p>
  38         Implements the IPPROTO_IP/IP_MULTICAST_LOOP socket option.
  39       </p>
  40 <h5>
  41 <a name="boost_asio.reference.ip__multicast__enable_loopback.h0"></a>
  42         <span class="phrase"><a name="boost_asio.reference.ip__multicast__enable_loopback.examples"></a></span><a class="link" href="ip__multicast__enable_loopback.html#boost_asio.reference.ip__multicast__enable_loopback.examples">Examples</a>
  43       </h5>
  44 <p>
  45         Setting the option:
  46       </p>
  47 <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">);</span>
  48 <span class="special">...</span>
  49 <span class="identifier">boost</span><span class="special">::</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">enable_loopback</span> <span class="identifier">option</span><span class="special">(</span><span class="keyword">true</span><span class="special">);</span>
  50 <span class="identifier">socket</span><span class="special">.</span><span class="identifier">set_option</span><span class="special">(</span><span class="identifier">option</span><span class="special">);</span>
  51 </pre>
  52 <p>
  53         Getting the current option value:
  54       </p>
  55 <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">);</span>
  56 <span class="special">...</span>
  57 <span class="identifier">boost</span><span class="special">::</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">enable_loopback</span> <span class="identifier">option</span><span class="special">;</span>
  58 <span class="identifier">socket</span><span class="special">.</span><span class="identifier">get_option</span><span class="special">(</span><span class="identifier">option</span><span class="special">);</span>
  59 <span class="keyword">bool</span> <span class="identifier">is_set</span> <span class="special">=</span> <span class="identifier">option</span><span class="special">.</span><span class="identifier">value</span><span class="special">();</span>
  60 </pre>
  61 <h5>
  62 <a name="boost_asio.reference.ip__multicast__enable_loopback.h1"></a>
  63         <span class="phrase"><a name="boost_asio.reference.ip__multicast__enable_loopback.requirements"></a></span><a class="link" href="ip__multicast__enable_loopback.html#boost_asio.reference.ip__multicast__enable_loopback.requirements">Requirements</a>
  64       </h5>
  65 <p>
  66         <span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/ip/multicast.hpp</code>
  67       </p>
  68 <p>
  69         <span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code>
  70       </p>
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