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<div class="section" title="has_service">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.has_service"></a><a class="link" href="has_service.html" title="has_service"> has_service</a>
</h3></div></div></div>
<p>
        <a class="indexterm" name="id940091"></a>
      </p>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
    <span class="keyword">typename</span> <a class="link" href="Service.html" title="Service requirements">Service</a><span class="special">&gt;</span>
<span class="keyword">bool</span> <span class="identifier">has_service</span><span class="special">(</span>
    <span class="identifier">io_service</span> <span class="special">&amp;</span> <span class="identifier">ios</span><span class="special">);</span>
</pre>
<p>
        This function is used to determine whether the <a class="link" href="io_service.html" title="io_service"><code class="computeroutput"><span class="identifier">io_service</span></code></a> contains a service object
        corresponding to the given service type.
      </p>
<a name="boost_asio.reference.has_service.parameters"></a><h5>
<a name="id940195"></a>
        <a class="link" href="has_service.html#boost_asio.reference.has_service.parameters">Parameters</a>
      </h5>
<div class="variablelist">
<p class="title"><b></b></p>
<dl>
<dt><span class="term">ios</span></dt>
<dd><p>
            The <a class="link" href="io_service.html" title="io_service"><code class="computeroutput"><span class="identifier">io_service</span></code></a>
            object that owns the service.
          </p></dd>
</dl>
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<a name="boost_asio.reference.has_service.return_value"></a><h5>
<a name="id940250"></a>
        <a class="link" href="has_service.html#boost_asio.reference.has_service.return_value">Return Value</a>
      </h5>
<p>
        A boolean indicating whether the <a class="link" href="io_service.html" title="io_service"><code class="computeroutput"><span class="identifier">io_service</span></code></a> contains the service.
      </p>
<a name="boost_asio.reference.has_service.requirements"></a><h5>
<a name="id940290"></a>
        <a class="link" href="has_service.html#boost_asio.reference.has_service.requirements">Requirements</a>
      </h5>
<p>
        <span class="bold"><strong>Header: </strong></span><code class="literal">boost/asio/io_service.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 &#169; 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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