span class="comment">// The number of collected records since the last write to the file</span>
    <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">m_collected_count</span><span class="special">;</span>
    <span class="comment">// The time when the collected data has been written to the file last time</span>
    <span class="identifier">boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">::</span><span cl