name="l00049"></a><span class="lineno">   49</span>&#160;</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;     <span class="keyword">protected</span>:</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;         std::string input_folder_path_;             <span class="comment">/* the folder path for the input folder. (folder) */</span></div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;         std::string in_o