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<div class="titlepage"><div><div><h4 class="title">
<a name="asio.reference.basic_socket_acceptor.keep_alive"></a><a class="link" href="keep_alive.html" title="basic_socket_acceptor::keep_alive">basic_socket_acceptor::keep_alive</a>
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<p>
<span class="emphasis"><em>Inherited from socket_base.</em></span>
</p>
<p>
<a class="indexterm" name="id870304"></a>
Socket option to send keep-alives.
</p>
<pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">implementation_defined</span> <span class="identifier">keep_alive</span><span class="special">;</span>
</pre>
<p>
Implements the SOL_SOCKET/SO_KEEPALIVE socket option.
</p>
<a name="asio.reference.basic_socket_acceptor.keep_alive.examples"></a><h6>
<a name="id870351"></a>
<a class="link" href="keep_alive.html#asio.reference.basic_socket_acceptor.keep_alive.examples">Examples</a>
</h6>
<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">tcp</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">socket_base</span><span class="special">::</span><span class="identifier">keep_alive</span> <span class="identifier">option</span><span class="special">(</span><span class="keyword">true</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">tcp</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">socket_base</span><span class="special">::</span><span class="identifier">keep_alive</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">bool</span> <span class="identifier">is_set</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.basic_socket_acceptor.keep_alive.requirements"></a><h6>
<a name="id870674"></a>
<a class="link" href="keep_alive.html#asio.reference.basic_socket_acceptor.keep_alive.requirements">Requirements</a>
</h6>
<p>
<span class="bold"><strong>Header: </strong></span><code class="literal">asio/basic_socket_acceptor.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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