bool FuzzyStringComparator::openInputFileStream_(const std::string& filename, std::ifstream& input_stream) const
 {
   input_stream.open(filename.c_str(), std::ios::in | std::ios::binary);
   if (!input_stream)
   {
     *log_dest_ << "Error opening first input file '" << filename << "'.\n";
     return false;
   }
   input_stream.unsetf(std::ios::skipws);
   return true;
 }