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<div class="titlepage"><div><div><h3 class="title">
<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="id1060450"></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="asio.reference.ip__unicast__hops.examples"></a><h5>
<a name="id1060496"></a>
<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">io_service</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">io_service</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>
<a name="asio.reference.ip__unicast__hops.requirements"></a><h5>
<a name="id1060835"></a>
<a class="link" href="ip__unicast__hops.html#asio.reference.ip__unicast__hops.requirements">Requirements</a>
</h5>
<p>
<span class="bold"><strong>Header: </strong></span><code class="literal">asio/ip/unicast.hpp</code>
</p>
<p>
<span class="bold"><strong>Convenience header: </strong></span><code class="literal">asio.hpp</code>
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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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