class="identifier">backend</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">make_shared</span><span class="special">&lt;</span> <span class="identifier">stat_collector</span> <span class="special">&gt;(</span><span class="identifier">file_name</span><span class="special">.</span><span class="identifier">c_str</span><span class="special">(),</span> <span class="identifier">write_interval</span><span class="special">);</span>
  