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   4 <title>Class template mutable_constant&lt;T, void, void, void&gt;</title>
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  18 <div class="refentry">
  19 <a name="boost.log.attributes.mutable__idm45711348642864"></a><div class="titlepage"></div>
  20 <div class="refnamediv">
  21 <h2><span class="refentrytitle">Class template mutable_constant&lt;T, void, void, void&gt;</span></h2>
  22 <p>boost::log::attributes::mutable_constant&lt;T, void, void, void&gt; &#8212; Specialization for unlocked case. </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="../../../attributes.html#header.boost.log.attributes.mutable_constant_hpp" title="Header &lt;boost/log/attributes/mutable_constant.hpp&gt;">boost/log/attributes/mutable_constant.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="mutable__idm45711348642864.html" title="Class template mutable_constant&lt;T, void, void, void&gt;">mutable_constant</a><span class="special">&lt;</span><span class="identifier">T</span><span class="special">,</span> <span class="keyword">void</span><span class="special">,</span> <span class="keyword">void</span><span class="special">,</span> <span class="keyword">void</span><span class="special">&gt;</span> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">attribute</span> <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="identifier">T</span> <a name="boost.log.attributes.mutable__idm45711348642864.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>  <span class="comment">// The attribute value type. </span>
  32
  33   <span class="comment">// member classes/structs/unions</span>
  34
  35   <span class="comment">// Factory implementation.</span>
  36
  37   <span class="keyword">class</span> <a class="link" href="mutable__idm45711348642864/impl.html" title="Class impl">impl</a> <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">attribute</span><span class="special">::</span><span class="identifier">impl</span> <span class="special">{</span>
  38   <span class="keyword">public</span><span class="special">:</span>
  39     <span class="comment">// <a class="link" href="mutable__idm45711348642864/impl.html#boost.log.attributes.mutable__idm45711348642864.implconstruct-copy-destruct">construct/copy/destruct</a></span>
  40     <span class="keyword">explicit</span> <a class="link" href="mutable__idm45711348642864/impl.html#idm45711348630464-bb"><span class="identifier">impl</span></a><span class="special">(</span><span class="identifier">value_type</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  41     <span class="keyword">explicit</span> <a class="link" href="mutable__idm45711348642864/impl.html#idm45711348628784-bb"><span class="identifier">impl</span></a><span class="special">(</span><span class="identifier">value_type</span> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  42
  43     <span class="comment">// <a class="link" href="mutable__idm45711348642864/impl.html#idm45711348637712-bb">public member functions</a></span>
  44     <span class="keyword">virtual</span> <a class="link" href="../attribute_value.html" title="Class attribute_value">attribute_value</a> <a class="link" href="mutable__idm45711348642864/impl.html#idm45711348637152-bb"><span class="identifier">get_value</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  45     <span class="keyword">void</span> <a class="link" href="mutable__idm45711348642864/impl.html#idm45711348634816-bb"><span class="identifier">set</span></a><span class="special">(</span><span class="identifier">value_type</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  46     <span class="keyword">void</span> <a class="link" href="mutable__idm45711348642864/impl.html#idm45711348633280-bb"><span class="identifier">set</span></a><span class="special">(</span><span class="identifier">value_type</span> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  47     <span class="identifier">value_type</span> <a class="link" href="mutable__idm45711348642864/impl.html#idm45711348631744-bb"><span class="identifier">get</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  48   <span class="special">}</span><span class="special">;</span>
  49
  50   <span class="comment">// <a class="link" href="mutable__idm45711348642864.html#boost.log.attributes.mutable__idm45711348642864construct-copy-destruct">construct/copy/destruct</a></span>
  51   <span class="keyword">explicit</span> <a class="link" href="mutable__idm45711348642864.html#idm45711348619728-bb"><span class="identifier">mutable_constant</span></a><span class="special">(</span><span class="identifier">value_type</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  52   <span class="keyword">explicit</span> <a class="link" href="mutable__idm45711348642864.html#idm45711348618032-bb"><span class="identifier">mutable_constant</span></a><span class="special">(</span><span class="identifier">value_type</span> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  53   <span class="keyword">explicit</span> <a class="link" href="mutable__idm45711348642864.html#idm45711348616336-bb"><span class="identifier">mutable_constant</span></a><span class="special">(</span><a class="link" href="cast_source.html" title="Class cast_source">cast_source</a> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  54
  55   <span class="comment">// <a class="link" href="mutable__idm45711348642864.html#idm45711348625952-bb">public member functions</a></span>
  56   <span class="keyword">void</span> <a class="link" href="mutable__idm45711348642864.html#idm45711348625392-bb"><span class="identifier">set</span></a><span class="special">(</span><span class="identifier">value_type</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  57   <span class="keyword">void</span> <a class="link" href="mutable__idm45711348642864.html#idm45711348623424-bb"><span class="identifier">set</span></a><span class="special">(</span><span class="identifier">value_type</span> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  58   <span class="identifier">value_type</span> <a class="link" href="mutable__idm45711348642864.html#idm45711348621456-bb"><span class="identifier">get</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  59
  60   <span class="comment">// <a class="link" href="mutable__idm45711348642864.html#idm45711348614368-bb">protected member functions</a></span>
  61   impl <span class="special">*</span> <a class="link" href="mutable__idm45711348642864.html#idm45711348613792-bb"><span class="identifier">get_impl</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  62 <span class="special">}</span><span class="special">;</span></pre></div>
  63 <div class="refsect1">
  64 <a name="idm45554751297456"></a><h2>Description</h2>
  65 <p>This version of attribute does not perform thread synchronization to access the stored value. </p>
  66 <div class="refsect2">
  67 <a name="idm45554751296672"></a><h3>
  68 <a name="boost.log.attributes.mutable__idm45711348642864construct-copy-destruct"></a><code class="computeroutput">mutable_constant</code>
  69         public
  70        construct/copy/destruct</h3>
  71 <div class="orderedlist"><ol class="orderedlist" type="1">
  72 <li class="listitem">
  73 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45711348619728-bb"></a><span class="identifier">mutable_constant</span><span class="special">(</span><span class="identifier">value_type</span> <span class="keyword">const</span> <span class="special">&amp;</span> value<span class="special">)</span><span class="special">;</span></pre>
  74 <p>Constructor with the stored value initialization </p>
  75 </li>
  76 <li class="listitem">
  77 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45711348618032-bb"></a><span class="identifier">mutable_constant</span><span class="special">(</span><span class="identifier">value_type</span> <span class="special">&amp;&amp;</span> value<span class="special">)</span><span class="special">;</span></pre>
  78 <p>Constructor with the stored value initialization </p>
  79 </li>
  80 <li class="listitem">
  81 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45711348616336-bb"></a><span class="identifier">mutable_constant</span><span class="special">(</span><a class="link" href="cast_source.html" title="Class cast_source">cast_source</a> <span class="keyword">const</span> <span class="special">&amp;</span> source<span class="special">)</span><span class="special">;</span></pre>
  82 <p>Constructor for casting support </p>
  83 </li>
  84 </ol></div>
  85 </div>
  86 <div class="refsect2">
  87 <a name="idm45554751274688"></a><h3>
  88 <a name="idm45711348625952-bb"></a><code class="computeroutput">mutable_constant</code> public member functions</h3>
  89 <div class="orderedlist"><ol class="orderedlist" type="1">
  90 <li class="listitem">
  91 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45711348625392-bb"></a><span class="identifier">set</span><span class="special">(</span><span class="identifier">value_type</span> <span class="keyword">const</span> <span class="special">&amp;</span> value<span class="special">)</span><span class="special">;</span></pre>
  92 <p>The method sets a new attribute value. </p>
  93 </li>
  94 <li class="listitem">
  95 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45711348623424-bb"></a><span class="identifier">set</span><span class="special">(</span><span class="identifier">value_type</span> <span class="special">&amp;&amp;</span> value<span class="special">)</span><span class="special">;</span></pre>
  96 <p>The method sets a new attribute value. </p>
  97 </li>
  98 <li class="listitem">
  99 <pre class="literallayout"><span class="identifier">value_type</span> <a name="idm45711348621456-bb"></a><span class="identifier">get</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
 100 <p>The method acquires the current attribute value. </p>
 101 </li>
 102 </ol></div>
 103 </div>
 104 <div class="refsect2">
 105 <a name="idm45554751254480"></a><h3>
 106 <a name="idm45711348614368-bb"></a><code class="computeroutput">mutable_constant</code> protected member functions</h3>
 107 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
 108 <pre class="literallayout">impl <span class="special">*</span> <a name="idm45711348613792-bb"></a><span class="identifier">get_impl</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
 109 <p>
 110 </p>
 111 <div class="variablelist"><table border="0" class="variablelist compact">
 112 <colgroup>
 113 <col align="left" valign="top">
 114 <col>
 115 </colgroup>
 116 <tbody><tr>
 117 <td><p><span class="term">Returns:</span></p></td>
 118 <td><p>Pointer to the factory implementation </p></td>
 119 </tr></tbody>
 120 </table></div>
 121 </li></ol></div>
 122 </div>
 123 </div>
 124 </div>
 125 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 126 <td align="left"></td>
 127 <td align="right"><div class="copyright-footer">Copyright &#169; 2007-2016 Andrey Semashev<p>
 128         Distributed under the Boost Software License, Version 1.0. (See accompanying
 129         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>).
 130       </p>
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