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   4 <title>Class template attribute_terminal</title>
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  18 <div class="refentry">
  19 <a name="boost.log.expressions.attribute_terminal"></a><div class="titlepage"></div>
  20 <div class="refnamediv">
  21 <h2><span class="refentrytitle">Class template attribute_terminal</span></h2>
  22 <p>boost::log::expressions::attribute_terminal</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.attr_fwd_hpp" title="Header &lt;boost/log/expressions/attr_fwd.hpp&gt;">boost/log/expressions/attr_fwd.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">,</span> <span class="keyword">typename</span> FallbackPolicyT<span class="special">,</span> <span class="keyword">typename</span> TagT<span class="special">&gt;</span>
  28 <span class="keyword">class</span> <a class="link" href="attribute_terminal.html" title="Class template attribute_terminal">attribute_terminal</a> <span class="special">{</span>
  29 <span class="keyword">public</span><span class="special">:</span>
  30   <span class="comment">// <a class="link" href="attribute_terminal.html#boost.log.expressions.attribute_terminalconstruct-copy-destruct">construct/copy/destruct</a></span>
  31   <span class="keyword">explicit</span> <a class="link" href="attribute_terminal.html#idm45711349564688-bb"><span class="identifier">attribute_terminal</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>
  32   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> U<span class="special">&gt;</span> <a class="link" href="attribute_terminal.html#idm45711349563008-bb"><span class="identifier">attribute_terminal</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="identifier">U</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  33   <a class="link" href="attribute_terminal.html#idm45711349560064-bb"><span class="identifier">attribute_terminal</span></a><span class="special">(</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span>
  34
  35   <span class="comment">// <a class="link" href="attribute_terminal.html#idm45711350199904-bb">public member functions</a></span>
  36   <span class="identifier">attribute_name</span> <a class="link" href="attribute_terminal.html#idm45711350199344-bb"><span class="identifier">get_name</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  37   <span class="identifier">fallback_policy</span> <span class="keyword">const</span>  <span class="special">&amp;</span> <a class="link" href="attribute_terminal.html#idm45711350197232-bb"><span class="identifier">get_fallback_policy</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  38   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> ContextT<span class="special">&gt;</span>
  39     result<span class="special">&lt;</span> this_type<span class="special">(</span><span class="identifier">ContextT</span> <span class="keyword">const</span>  <span class="special">&amp;</span><span class="special">)</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <a class="link" href="attribute_terminal.html#idm45711350195104-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">ContextT</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  40   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> ContextT<span class="special">&gt;</span>
  41     result<span class="special">&lt;</span> <span class="keyword">const</span> this_type<span class="special">(</span><span class="identifier">ContextT</span> <span class="keyword">const</span>  <span class="special">&amp;</span><span class="special">)</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
  42     <a class="link" href="attribute_terminal.html#idm45711349568688-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">ContextT</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  43 <span class="special">}</span><span class="special">;</span></pre></div>
  44 <div class="refsect1">
  45 <a name="idm45554747847552"></a><h2>Description</h2>
  46 <p>An attribute value extraction terminal </p>
  47 <div class="refsect2">
  48 <a name="idm45554747846912"></a><h3>
  49 <a name="boost.log.expressions.attribute_terminalconstruct-copy-destruct"></a><code class="computeroutput">attribute_terminal</code>
  50         public
  51        construct/copy/destruct</h3>
  52 <div class="orderedlist"><ol class="orderedlist" type="1">
  53 <li class="listitem">
  54 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45711349564688-bb"></a><span class="identifier">attribute_terminal</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>
  55 <p>Initializing constructor </p>
  56 </li>
  57 <li class="listitem">
  58 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> U<span class="special">&gt;</span>
  59   <a name="idm45711349563008-bb"></a><span class="identifier">attribute_terminal</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="identifier">U</span> <span class="keyword">const</span> <span class="special">&amp;</span> arg<span class="special">)</span><span class="special">;</span></pre>
  60 <p>Initializing constructor </p>
  61 </li>
  62 <li class="listitem"><pre class="literallayout"><a name="idm45711349560064-bb"></a><span class="identifier">attribute_terminal</span><span class="special">(</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">delete</span><span class="special">;</span></pre></li>
  63 </ol></div>
  64 </div>
  65 <div class="refsect2">
  66 <a name="idm45554747824384"></a><h3>
  67 <a name="idm45711350199904-bb"></a><code class="computeroutput">attribute_terminal</code> public member functions</h3>
  68 <div class="orderedlist"><ol class="orderedlist" type="1">
  69 <li class="listitem">
  70 <pre class="literallayout"><span class="identifier">attribute_name</span> <a name="idm45711350199344-bb"></a><span class="identifier">get_name</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
  71 <p>
  72 </p>
  73 <div class="variablelist"><table border="0" class="variablelist compact">
  74 <colgroup>
  75 <col align="left" valign="top">
  76 <col>
  77 </colgroup>
  78 <tbody><tr>
  79 <td><p><span class="term">Returns:</span></p></td>
  80 <td><p>Attribute value name </p></td>
  81 </tr></tbody>
  82 </table></div>
  83 </li>
  84 <li class="listitem">
  85 <pre class="literallayout"><span class="identifier">fallback_policy</span> <span class="keyword">const</span>  <span class="special">&amp;</span> <a name="idm45711350197232-bb"></a><span class="identifier">get_fallback_policy</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
  86 <p>
  87 </p>
  88 <div class="variablelist"><table border="0" class="variablelist compact">
  89 <colgroup>
  90 <col align="left" valign="top">
  91 <col>
  92 </colgroup>
  93 <tbody><tr>
  94 <td><p><span class="term">Returns:</span></p></td>
  95 <td><p>Fallback policy </p></td>
  96 </tr></tbody>
  97 </table></div>
  98 </li>
  99 <li class="listitem">
 100 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> ContextT<span class="special">&gt;</span>
 101   result<span class="special">&lt;</span> this_type<span class="special">(</span><span class="identifier">ContextT</span> <span class="keyword">const</span>  <span class="special">&amp;</span><span class="special">)</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 102   <a name="idm45711350195104-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">ContextT</span> <span class="keyword">const</span> <span class="special">&amp;</span> ctx<span class="special">)</span><span class="special">;</span></pre>
 103 <p>The operator extracts attribute value </p>
 104 </li>
 105 <li class="listitem">
 106 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> ContextT<span class="special">&gt;</span>
 107   result<span class="special">&lt;</span> <span class="keyword">const</span> this_type<span class="special">(</span><span class="identifier">ContextT</span> <span class="keyword">const</span>  <span class="special">&amp;</span><span class="special">)</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
 108   <a name="idm45711349568688-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">ContextT</span> <span class="keyword">const</span> <span class="special">&amp;</span> ctx<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
 109 <p>The operator extracts attribute value </p>
 110 </li>
 111 </ol></div>
 112 </div>
 113 </div>
 114 </div>
 115 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 116 <td align="left"></td>
 117 <td align="right"><div class="copyright-footer">Copyright &#169; 2007-2016 Andrey Semashev<p>
 118         Distributed under the Boost Software License, Version 1.0. (See accompanying
 119         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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