libs/log/doc/html/boost/log/expressions/attribute_terminal.html


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<title>Class template attribute_terminal</title>
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<h2><span class="refentrytitle">Class template attribute_terminal</span></h2>
<p>boost::log::expressions::attribute_terminal</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.attr_hpp" title="Header &lt;boost/log/expressions/attr.hpp&gt;">boost/log/expressions/attr.hpp</a>&gt;

</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> 
<span class="keyword">class</span> <a class="link" href="attribute_terminal.html" title="Class template attribute_terminal">attribute_terminal</a> <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">void</span>                                  <a name="boost.log.expressions.attribute_terminal._is_boost_log_terminal"></a><span class="identifier">_is_boost_log_terminal</span><span class="special">;</span>  <span class="comment">// Internal typedef for type categorization. </span>
  <span class="keyword">typedef</span> <span class="identifier">TagT</span>                                  <a name="boost.log.expressions.attribute_terminal.tag_type"></a><span class="identifier">tag_type</span><span class="special">;</span>                <span class="comment">// Attribute tag type. </span>
  <span class="keyword">typedef</span> <span class="identifier">value_extractor_type</span><span class="special">::</span><span class="identifier">value_type</span>      <a name="boost.log.expressions.attribute_terminal.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>              <span class="comment">// Attribute value type. </span>
  <span class="keyword">typedef</span> <span class="identifier">value_extractor_type</span><span class="special">::</span><span class="identifier">fallback_policy</span> <a name="boost.log.expressions.attribute_terminal.fallback_policy"></a><span class="identifier">fallback_policy</span><span class="special">;</span>         <span class="comment">// Fallback policy type. </span>

  <span class="comment">// member classes/structs/unions</span>

  <span class="comment">// Function result type.</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="special">&gt;</span> 
  <span class="keyword">struct</span> <a class="link" href="attribute_terminal/result.html" title="Struct template result">result</a> <span class="special">{</span>
  <span class="special">}</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> ThisT<span class="special">,</span> <span class="keyword">typename</span> ContextT<span class="special">&gt;</span> 
  <span class="keyword">struct</span> <a class="link" href="attribute_terminal/result_ThisT_C_idp33355232.html" title="Struct template result&lt;ThisT(ContextT)&gt;">result</a><span class="special">&lt;</span><span class="identifier">ThisT</span><span class="special">(</span><span class="identifier">ContextT</span><span class="special">)</span><span class="special">&gt;</span> <span class="special">{</span>
    <span class="comment">// types</span>
    <span class="keyword">typedef</span> <span class="identifier">remove_cv</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">remove_reference</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">env</span><span class="special">&lt;</span> <span class="identifier">ContextT</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>                          <a class="link" href="attribute_terminal/result_ThisT_C_idp33355232.html#boost.log.expressions.attribute_terminal.result_ThisT(C_idp33355232.env_type"><span class="identifier">env_type</span></a><span class="special">;</span>               
    <span class="keyword">typedef</span> <span class="identifier">env_type</span><span class="special">::</span><span class="identifier">args_type</span>                                                                                                               <a class="link" href="attribute_terminal/result_ThisT_C_idp33355232.html#boost.log.expressions.attribute_terminal.result_ThisT(C_idp33355232.args_type"><span class="identifier">args_type</span></a><span class="special">;</span>              
    <span class="keyword">typedef</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span>                                                                                                                       <a class="link" href="attribute_terminal/result_ThisT_C_idp33355232.html#boost.log.expressions.attribute_terminal.result_ThisT(C_idp33355232.cv_value_extractor_type"><span class="identifier">cv_value_extractor_type</span></a><span class="special">;</span>
    <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">&lt;</span> <span class="identifier">cv_value_extractor_type</span><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="keyword">typename</span> <span class="identifier">fusion</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">at_c</span><span class="special">&lt;</span> <span class="identifier">args_type</span><span class="special">,</span> <span class="number">0</span> <span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</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/result_ThisT_C_idp33355232.html#boost.log.expressions.attribute_terminal.result_ThisT(C_idp33355232.type"><span class="identifier">type</span></a><span class="special">;</span>                   
  <span class="special">}</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="attribute_terminal.html#boost.log.expressions.attribute_terminalconstruct-copy-destruct">construct/copy/destruct</a></span>
  <span class="keyword">explicit</span> <a class="link" href="attribute_terminal.html#idp33475280-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>
  <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#idp33476960-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>
  <a class="link" href="attribute_terminal.html#idp33479904-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>

  <span class="comment">// <a class="link" href="attribute_terminal.html#idp34191904-bb">public member functions</a></span>
  <span class="identifier">attribute_name</span> <a class="link" href="attribute_terminal.html#idp34192464-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>
  <span class="identifier">fallback_policy</span> <span class="keyword">const</span> <span class="special">&amp;</span> <a class="link" href="attribute_terminal.html#idp34194416-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>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> ContextT<span class="special">&gt;</span> 
    <a class="link" href="attribute_terminal/result.html" title="Struct template result">result</a><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#idp34196368-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>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> ContextT<span class="special">&gt;</span> 
    <a class="link" href="attribute_terminal/result.html" title="Struct template result">result</a><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> 
    <a class="link" href="attribute_terminal.html#idp33471280-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>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp94369424"></a><h2>Description</h2>
<p>An attribute value extraction terminal </p>
<div class="refsect2">
<a name="idp94370144"></a><h3>
<a name="boost.log.expressions.attribute_terminalconstruct-copy-destruct"></a><code class="computeroutput">attribute_terminal</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="idp33475280-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>
<p>Initializing constructor </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> U<span class="special">&gt;</span> 
  <a name="idp33476960-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>
<p>Initializing constructor </p>
</li>
<li class="listitem"><pre class="literallayout"><a name="idp33479904-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>
</ol></div>
</div>
<div class="refsect2">
<a name="idp94395424"></a><h3>
<a name="idp34191904-bb"></a><code class="computeroutput">attribute_terminal</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="identifier">attribute_name</span> <a name="idp34192464-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>
<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">Returns:</span></p></td>
<td><p>Attribute value name </p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">fallback_policy</span> <span class="keyword">const</span> <span class="special">&amp;</span> <a name="idp34194416-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>
<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">Returns:</span></p></td>
<td><p>Fallback policy </p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> ContextT<span class="special">&gt;</span> 
  <a class="link" href="attribute_terminal/result.html" title="Struct template result">result</a><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 name="idp34196368-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>
<p>The operator extracts attribute value </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> ContextT<span class="special">&gt;</span> 
  <a class="link" href="attribute_terminal/result.html" title="Struct template result">result</a><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> 
  <a name="idp33471280-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>
<p>The operator extracts attribute value </p>
</li>
</ol></div>
</div>
</div>
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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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