/span><span class="special">;</span>

  <span class="comment">// public data members</span>
  <span class="identifier">const_string</span> <span class="identifier">m_file_name</span><span class="special">;</span>  <span class="comment">// log checkpoint file name </span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">m_line_num</span><span class="special">;</span>  <span class="comment">// log checkpoint file name </span>
 