1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>ip::multicast::hops</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__multicast__enable_loopback.html" title="ip::multicast::enable_loopback"> 10<link rel="next" href="ip__multicast__join_group.html" title="ip::multicast::join_group"> 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__multicast__enable_loopback.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__join_group.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__hops"></a><a class="link" href="ip__multicast__hops.html" title="ip::multicast::hops">ip::multicast::hops</a> 28</h3></div></div></div> 29<p> 30 <a class="indexterm" name="boost_asio.indexterm.ip__multicast__hops"></a> 31Socket option 32 for time-to-live associated with outgoing multicast packets. 33 </p> 34<pre class="programlisting">typedef implementation_defined hops; 35</pre> 36<p> 37 Implements the IPPROTO_IP/IP_MULTICAST_TTL socket option. 38 </p> 39<h5> 40<a name="boost_asio.reference.ip__multicast__hops.h0"></a> 41 <span class="phrase"><a name="boost_asio.reference.ip__multicast__hops.examples"></a></span><a class="link" href="ip__multicast__hops.html#boost_asio.reference.ip__multicast__hops.examples">Examples</a> 42 </h5> 43<p> 44 Setting the option: 45 </p> 46<pre class="programlisting">boost::asio::ip::udp::socket socket(my_context); 47... 48boost::asio::ip::multicast::hops option(4); 49socket.set_option(option); 50</pre> 51<p> 52 Getting the current option value: 53 </p> 54<pre class="programlisting">boost::asio::ip::udp::socket socket(my_context); 55... 56boost::asio::ip::multicast::hops option; 57socket.get_option(option); 58int ttl = option.value(); 59</pre> 60<h5> 61<a name="boost_asio.reference.ip__multicast__hops.h1"></a> 62 <span class="phrase"><a name="boost_asio.reference.ip__multicast__hops.requirements"></a></span><a class="link" href="ip__multicast__hops.html#boost_asio.reference.ip__multicast__hops.requirements">Requirements</a> 63 </h5> 64<p> 65 <span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/ip/multicast.hpp</code> 66 </p> 67<p> 68 <span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code> 69 </p> 70</div> 71<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 72<td align="left"></td> 73<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 74 Kohlhoff<p> 75 Distributed under the Boost Software License, Version 1.0. (See accompanying 76 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>) 77 </p> 78</div></td> 79</tr></table> 80<hr> 81<div class="spirit-nav"> 82<a accesskey="p" href="ip__multicast__enable_loopback.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__join_group.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a> 83</div> 84</body> 85</html> 86
