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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.placeholders__signal_number"></a><a class="link" href="placeholders__signal_number.html" title="placeholders::signal_number">placeholders::signal_number</a>
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<p>
        <a class="indexterm" name="id1453506"></a> 
An argument placeholder, for use with boost::bind(),
        that corresponds to the signal_number argument of a handler for asynchronous
        functions such as <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">signal_set</span><span class="special">::</span><span class="identifier">async_wait</span></code>.
      </p>
<pre class="programlisting"><span class="identifier">unspecified</span> <span class="identifier">signal_number</span><span class="special">;</span>
</pre>
<h5>
<a name="boost_asio.reference.placeholders__signal_number.h0"></a>
        <span><a name="boost_asio.reference.placeholders__signal_number.requirements"></a></span><a class="link" href="placeholders__signal_number.html#boost_asio.reference.placeholders__signal_number.requirements">Requirements</a>
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<p>
        <span class="bold"><strong>Header: </strong></span><code class="literal">boost/asio/placeholders.hpp</code>
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<p>
        <span class="bold"><strong>Convenience header: </strong></span><code class="literal">boost/asio.hpp</code>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2012 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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