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<h2><span class="refentrytitle">Function template visit</span></h2>
<p>boost::log::visit</p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../attributes.html#header.boost.log.attributes.value_visitation_hpp" title="Header &lt;boost/log/attributes/value_visitation.hpp&gt;">boost/log/attributes/value_visitation.hpp</a>&gt;

</span>
<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> DescriptorT<span class="special">,</span> <span class="keyword">template</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="special">&gt;</span> <span class="keyword">class</span> ActorT<span class="special">,</span> 
         <span class="keyword">typename</span> VisitorT<span class="special">&gt;</span> 
  <a class="link" href="visitation_result.html" title="Class visitation_result">visitation_result</a> 
  <span class="identifier">visit</span><span class="special">(</span><span class="identifier">expressions</span><span class="special">::</span><span class="identifier">attribute_keyword</span><span class="special">&lt;</span> <span class="identifier">DescriptorT</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span> keyword<span class="special">,</span> 
        <span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span> rec<span class="special">,</span> <span class="identifier">VisitorT</span> visitor<span class="special">)</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp94145360"></a><h2>Description</h2>
<p>The function applies a visitor to an attribute value from the view. The user has to explicitly specify the type or set of possible types of the attribute value to be visited.</p>
<p>

</p>
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<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
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<td><p><span class="term"><code class="computeroutput">keyword</code></span></p></td>
<td><p>The keyword of the attribute value to visit. </p></td>
</tr>
<tr>
<td><p><span class="term"><code class="computeroutput">rec</code></span></p></td>
<td><p>A log record view. The attribute value will be sought among those associated with the record. </p></td>
</tr>
<tr>
<td><p><span class="term"><code class="computeroutput">visitor</code></span></p></td>
<td><p>A receiving function object to pass the attribute value to. </p></td>
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</tbody>
</table></div></td>
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<td><p><span class="term">Returns:</span></p></td>
<td><p>The result of visitation. </p></td>
</tr>
</tbody>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2007-2014 Andrey Semashev<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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