pe"></a><span class="identifier">value_type</span><span class="special">;</span>      <span class="comment">// Attribute value type. </span>

  <span class="comment">// <a class="link" href="add_value_manip.html#boost.log.add_value_manipconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="add_value_manip.html#idm46093042950000-bb"><span class="identifier">add_value_manip</span></a><span class="special">(</span><span class="identifier">attribute_name</span> <span class="keyword