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   4 <title>Class template has_attribute</title>
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  19 <a name="boost.log.expressions.has_attribute"></a><div class="titlepage"></div>
  20 <div class="refnamediv">
  21 <h2><span class="refentrytitle">Class template has_attribute</span></h2>
  22 <p>boost::log::expressions::has_attribute</p>
  23 </div>
  24 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  25 <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;
  26
  27 </span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span>
  28 <span class="keyword">class</span> <a class="link" href="has_attribute.html" title="Class template has_attribute">has_attribute</a> <span class="special">{</span>
  29 <span class="keyword">public</span><span class="special">:</span>
  30   <span class="comment">// types</span>
  31   <span class="keyword">typedef</span> <span class="keyword">bool</span> <a name="boost.log.expressions.has_attribute.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>  <span class="comment">// Function result_type. </span>
  32   <span class="keyword">typedef</span> <span class="identifier">T</span>    <a name="boost.log.expressions.has_attribute.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>   <span class="comment">// Expected attribute value type. </span>
  33
  34   <span class="comment">// <a class="link" href="has_attribute.html#boost.log.expressions.has_attributeconstruct-copy-destruct">construct/copy/destruct</a></span>
  35   <span class="keyword">explicit</span> <a class="link" href="has_attribute.html#idm45711347226448-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>
  36
  37   <span class="comment">// <a class="link" href="has_attribute.html#idm45711347232336-bb">public member functions</a></span>
  38   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> ArgT<span class="special">&gt;</span> <span class="identifier">result_type</span> <a class="link" href="has_attribute.html#idm45711347231776-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">ArgT</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  39 <span class="special">}</span><span class="special">;</span></pre></div>
  40 <div class="refsect1">
  41 <a name="idm45554740735248"></a><h2>Description</h2>
  42 <p>An attribute value presence checker. </p>
  43 <div class="refsect2">
  44 <a name="idm45554740734528"></a><h3>
  45 <a name="boost.log.expressions.has_attributeconstruct-copy-destruct"></a><code class="computeroutput">has_attribute</code>
  46         public
  47        construct/copy/destruct</h3>
  48 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
  49 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45711347226448-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>
  50 <p>Initializing constructor</p>
  51 <p>
  52 </p>
  53 <div class="variablelist"><table border="0" class="variablelist compact">
  54 <colgroup>
  55 <col align="left" valign="top">
  56 <col>
  57 </colgroup>
  58 <tbody><tr>
  59 <td><p><span class="term">Parameters:</span></p></td>
  60 <td><div class="variablelist"><table border="0" class="variablelist compact">
  61 <colgroup>
  62 <col align="left" valign="top">
  63 <col>
  64 </colgroup>
  65 <tbody><tr>
  66 <td><p><span class="term"><code class="computeroutput">name</code></span></p></td>
  67 <td><p>Attribute name </p></td>
  68 </tr></tbody>
  69 </table></div></td>
  70 </tr></tbody>
  71 </table></div>
  72 </li></ol></div>
  73 </div>
  74 <div class="refsect2">
  75 <a name="idm45554740722576"></a><h3>
  76 <a name="idm45711347232336-bb"></a><code class="computeroutput">has_attribute</code> public member functions</h3>
  77 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
  78 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> ArgT<span class="special">&gt;</span> <span class="identifier">result_type</span> <a name="idm45711347231776-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">ArgT</span> <span class="keyword">const</span> <span class="special">&amp;</span> arg<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
  79 <p>Checking operator</p>
  80 <p>
  81
  82 </p>
  83 <div class="variablelist"><table border="0" class="variablelist compact">
  84 <colgroup>
  85 <col align="left" valign="top">
  86 <col>
  87 </colgroup>
  88 <tbody>
  89 <tr>
  90 <td><p><span class="term">Parameters:</span></p></td>
  91 <td><div class="variablelist"><table border="0" class="variablelist compact">
  92 <colgroup>
  93 <col align="left" valign="top">
  94 <col>
  95 </colgroup>
  96 <tbody><tr>
  97 <td><p><span class="term"><code class="computeroutput">arg</code></span></p></td>
  98 <td><p>A set of attribute values or a log record </p></td>
  99 </tr></tbody>
 100 </table></div></td>
 101 </tr>
 102 <tr>
 103 <td><p><span class="term">Returns:</span></p></td>
 104 <td><p><code class="computeroutput">true</code> if the log record contains the sought attribute value, <code class="computeroutput">false</code> otherwise </p></td>
 105 </tr>
 106 </tbody>
 107 </table></div>
 108 </li></ol></div>
 109 </div>
 110 <div class="refsect2">
 111 <a name="idm45554740704080"></a><h3>Specializations</h3>
 112 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p><a class="link" href="has_attr_idm45711347224064.html" title="Class has_attribute&lt;void&gt;">Class has_attribute&lt;void&gt;</a></p></li></ul></div>
 113 </div>
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 118 <td align="right"><div class="copyright-footer">Copyright &#169; 2007-2016 Andrey Semashev<p>
 119         Distributed under the Boost Software License, Version 1.0. (See accompanying
 120         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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