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<a name="boost.log.expressions.has_attribute__idp43448480"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Class has_attribute&lt;void&gt;</span></h2>
<p>boost::log::expressions::has_attribute&lt;void&gt;</p>
</div>
<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="../../../expressions.html#header.boost.log.expressions.predicates.has_attr_hpp" title="Header &lt;boost/log/expressions/predicates/has_attr.hpp&gt;">boost/log/expressions/predicates/has_attr.hpp</a>&gt;
</span>
<span class="keyword">class</span> <a class="link" href="has_attribute__idp43448480.html" title="Class has_attribute&lt;void&gt;">has_attribute</a><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="comment">// types</span>
<span class="keyword">typedef</span> <span class="keyword">bool</span> <a name="boost.log.expressions.has_attribute__idp43448480.result_type"></a><span class="identifier">result_type</span><span class="special">;</span> <span class="comment">// Function result_type. </span>
<span class="keyword">typedef</span> <span class="keyword">void</span> <a name="boost.log.expressions.has_attribute__idp43448480.value_type"></a><span class="identifier">value_type</span><span class="special">;</span> <span class="comment">// Expected attribute value type. </span>
<span class="comment">// <a class="link" href="has_attribute__idp43448480.html#boost.log.expressions.has_attribute__idp43448480construct-copy-destruct">construct/copy/destruct</a></span>
<span class="keyword">explicit</span> <a class="link" href="has_attribute__idp43448480.html#idp43461408-bb"><span class="identifier">has_attribute</span></a><span class="special">(</span><span class="identifier">attribute_name</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="has_attribute__idp43448480.html#idp43452384-bb">public member functions</a></span>
<span class="identifier">result_type</span> <a class="link" href="has_attribute__idp43448480.html#idp43452944-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">attribute_value_set</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="identifier">result_type</span> <a class="link" href="has_attribute__idp43448480.html#idp43457104-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">log</span><span class="special">::</span><span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp118061712"></a><h2>Description</h2>
<p>An attribute value presence checker. This specialization does not check the type of the attribute value. </p>
<div class="refsect2">
<a name="idp118062512"></a><h3>
<a name="boost.log.expressions.has_attribute__idp43448480construct-copy-destruct"></a><code class="computeroutput">has_attribute</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="idp43461408-bb"></a><span class="identifier">has_attribute</span><span class="special">(</span><span class="identifier">attribute_name</span> <span class="keyword">const</span> <span class="special">&amp;</span> name<span class="special">)</span><span class="special">;</span></pre>
<p>Initializing constructor</p>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">name</code></span></p></td>
<td><p>Attribute name </p></td>
</tr></tbody>
</table></div></td>
</tr></tbody>
</table></div>
</li></ol></div>
</div>
<div class="refsect2">
<a name="idp118074704"></a><h3>
<a name="idp43452384-bb"></a><code class="computeroutput">has_attribute</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="identifier">result_type</span> <a name="idp43452944-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">attribute_value_set</span> <span class="keyword">const</span> <span class="special">&amp;</span> attrs<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Checking operator</p>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">attrs</code></span></p></td>
<td><p>A set of attribute values </p></td>
</tr></tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p><code class="computeroutput">true</code> if the log record contains the sought attribute value, <code class="computeroutput">false</code> otherwise </p></td>
</tr>
</tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">result_type</span> <a name="idp43457104-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">log</span><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="keyword">const</span><span class="special">;</span></pre>
<p>Checking operator</p>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Parameters:</span></p></td>
<td><div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><code class="computeroutput">rec</code></span></p></td>
<td><p>A log record </p></td>
</tr></tbody>
</table></div></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p><code class="computeroutput">true</code> if the log record contains the sought attribute value, <code class="computeroutput">false</code> otherwise </p></td>
</tr>
</tbody>
</table></div>
</li>
</ol></div>
</div>
</div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2007-2015 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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