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2023-10-24 21:59:30 -04:00
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
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<a name="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="asio.indexterm.ip__unicast__hops"></a>
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<p>
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>
<h5>
<a name="asio.reference.ip__unicast__hops.h0"></a>
<span><a name="asio.reference.ip__unicast__hops.examples"></a></span><a class="link" href="ip__unicast__hops.html#asio.reference.ip__unicast__hops.examples">Examples</a>
</h5>
<p>
Setting the option:
</p>
<pre class="programlisting"><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">my_context</span><span class="special">);</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">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">my_context</span><span class="special">);</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>
<h5>
<a name="asio.reference.ip__unicast__hops.h1"></a>
<span><a name="asio.reference.ip__unicast__hops.requirements"></a></span><a class="link" href="ip__unicast__hops.html#asio.reference.ip__unicast__hops.requirements">Requirements</a>
</h5>
<p>
<span class="emphasis"><em>Header: </em></span><code class="literal">asio/ip/unicast.hpp</code>
</p>
<p>
<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
</p>
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<div class="copyright-footer">Copyright © 2003-2023 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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