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| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="boost_asio.reference.ip__unicast__hops"></a><a class="link" href="ip__unicast__hops.html" title="ip::unicast::hops">ip::unicast::hops</a> |
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| <p> |
| <a class="indexterm" name="id1233640"></a> |
| Socket option for time-to-live associated with outgoing |
| unicast packets. |
| </p> |
| <pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">implementation_defined</span> <span class="identifier">hops</span><span class="special">;</span> |
| </pre> |
| <p> |
| Implements the IPPROTO_IP/IP_UNICAST_TTL socket option. |
| </p> |
| <a name="boost_asio.reference.ip__unicast__hops.examples"></a><h5> |
| <a name="id1233688"></a> |
| <a class="link" href="ip__unicast__hops.html#boost_asio.reference.ip__unicast__hops.examples">Examples</a> |
| </h5> |
| <p> |
| Setting the option: |
| </p> |
| <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> |
| <span class="special">...</span> |
| <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">unicast</span><span class="special">::</span><span class="identifier">hops</span> <span class="identifier">option</span><span class="special">(</span><span class="number">4</span><span class="special">);</span> |
| <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> |
| </pre> |
| <p> |
| Getting the current option value: |
| </p> |
| <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> |
| <span class="special">...</span> |
| <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">unicast</span><span class="special">::</span><span class="identifier">hops</span> <span class="identifier">option</span><span class="special">;</span> |
| <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> |
| <span class="keyword">int</span> <span class="identifier">ttl</span> <span class="special">=</span> <span class="identifier">option</span><span class="special">.</span><span class="identifier">value</span><span class="special">();</span> |
| </pre> |
| <a name="boost_asio.reference.ip__unicast__hops.requirements"></a><h5> |
| <a name="id1234056"></a> |
| <a class="link" href="ip__unicast__hops.html#boost_asio.reference.ip__unicast__hops.requirements">Requirements</a> |
| </h5> |
| <p> |
| <span class="bold"><strong>Header: </strong></span><code class="literal">boost/asio/ip/unicast.hpp</code> |
| </p> |
| <p> |
| <span class="bold"><strong>Convenience header: </strong></span><code class="literal">boost/asio.hpp</code> |
| </p> |
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| <td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 Christopher M. Kohlhoff<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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>) |
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