1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>ip::multicast::enable_loopback</title> 5<link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../boost_asio.html" title="Boost.Asio"> 8<link rel="up" href="../reference.html" title="Reference"> 9<link rel="prev" href="ip__icmp/v6.html" title="ip::icmp::v6"> 10<link rel="next" href="ip__multicast__hops.html" title="ip::multicast::hops"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td> 15<td align="center"><a href="../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="ip__icmp/v6.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../boost_asio.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="ip__multicast__hops.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 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> 28</h3></div></div></div> 29<p> 30 <a class="indexterm" name="boost_asio.indexterm.ip__multicast__enable_loopback"></a> 31Socket 32 option determining whether outgoing multicast packets will be received on 33 the same socket if it is a member of the multicast group. 34 </p> 35<pre class="programlisting">typedef implementation_defined enable_loopback; 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">boost::asio::ip::udp::socket socket(my_context); 48... 49boost::asio::ip::multicast::enable_loopback option(true); 50socket.set_option(option); 51</pre> 52<p> 53 Getting the current option value: 54 </p> 55<pre class="programlisting">boost::asio::ip::udp::socket socket(my_context); 56... 57boost::asio::ip::multicast::enable_loopback option; 58socket.get_option(option); 59bool is_set = option.value(); 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> 71</div> 72<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 73<td align="left"></td> 74<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 75 Kohlhoff<p> 76 Distributed under the Boost Software License, Version 1.0. (See accompanying 77 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 78 </p> 79</div></td> 80</tr></table> 81<hr> 82<div class="spirit-nav"> 83<a accesskey="p" href="ip__icmp/v6.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../boost_asio.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="ip__multicast__hops.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 84</div> 85</body> 86</html> 87
