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   4 <title>Class template basic_clock</title>
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  19 <a name="boost.log.attributes.basic_clock"></a><div class="titlepage"></div>
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  21 <h2><span class="refentrytitle">Class template basic_clock</span></h2>
  22 <p>boost::log::attributes::basic_clock &#8212; A class of an attribute that makes an attribute value of the current date and time. </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.clock_hpp" title="Header &lt;boost/log/attributes/clock.hpp&gt;">boost/log/attributes/clock.hpp</a>&gt;
  26
  27 </span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> TimeTraitsT<span class="special">&gt;</span>
  28 <span class="keyword">class</span> <a class="link" href="basic_clock.html" title="Class template basic_clock">basic_clock</a> <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">TimeTraitsT</span><span class="special">::</span><span class="identifier">time_type</span> <a name="boost.log.attributes.basic_clock.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>  <span class="comment">// Generated value type. </span>
  32
  33   <span class="comment">// member classes/structs/unions</span>
  34
  35   <span class="comment">// Attribute factory implementation.</span>
  36
  37   <span class="keyword">struct</span> <a class="link" href="basic_clock/impl.html" title="Struct 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
  39     <span class="comment">// <a class="link" href="basic_clock/impl.html#idp35241488-bb">public member functions</a></span>
  40     <span class="keyword">virtual</span> <a class="link" href="../attribute_value.html" title="Class attribute_value">attribute_value</a> <a class="link" href="basic_clock/impl.html#idp35242048-bb"><span class="identifier">get_value</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  41   <span class="special">}</span><span class="special">;</span>
  42
  43   <span class="comment">// <a class="link" href="basic_clock.html#boost.log.attributes.basic_clockconstruct-copy-destruct">construct/copy/destruct</a></span>
  44   <a class="link" href="basic_clock.html#idp35246240-bb"><span class="identifier">basic_clock</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  45   <span class="keyword">explicit</span> <a class="link" href="basic_clock.html#idp35246944-bb"><span class="identifier">basic_clock</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>
  46 <span class="special">}</span><span class="special">;</span></pre></div>
  47 <div class="refsect1">
  48 <a name="idp89268720"></a><h2>Description</h2>
  49 <p>The attribute generates current time stamp as a value. The type of the attribute value is determined with time traits passed to the class template as a template parameter. The time traits provided by the library use <code class="computeroutput">boost::posix_time::ptime</code> as the time type.</p>
  50 <p>Time traits also determine the way time is acquired. There are two types of time traits provided by the library: <code class="computeroutput"><a class="link" href="utc_time_traits.html" title="Struct utc_time_traits">utc_time_traits</a></code> and <code class="computeroutput"><a class="link" href="local_time_traits.html" title="Struct local_time_traits">local_time_traits</a></code>. The first returns UTC time, the second returns local time. </p>
  51 <div class="refsect2">
  52 <a name="idp89273328"></a><h3>
  53 <a name="boost.log.attributes.basic_clockconstruct-copy-destruct"></a><code class="computeroutput">basic_clock</code>
  54         public
  55        construct/copy/destruct</h3>
  56 <div class="orderedlist"><ol class="orderedlist" type="1">
  57 <li class="listitem">
  58 <pre class="literallayout"><a name="idp35246240-bb"></a><span class="identifier">basic_clock</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
  59 <p>Default constructor </p>
  60 </li>
  61 <li class="listitem">
  62 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idp35246944-bb"></a><span class="identifier">basic_clock</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>
  63 <p>Constructor for casting support </p>
  64 </li>
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  71 <td align="right"><div class="copyright-footer">Copyright &#169; 2007-2014 Andrey Semashev<p>
  72         Distributed under the Boost Software License, Version 1.0. (See accompanying
  73         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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