text: #ifndef DTL_PRINTERS
  #define DTL_PRINTERS
  
  template <typename sesElem, typename stream = ostream >
  class customChangePrinter : public Printer < sesElem, stream >
  {
  public :
      customChangePrinter () : Printer < sesElem, stream > () {}
      customChangePrinter (stream& out) : Printer < sesElem, stream > (out) {}
      ~customChangePrinter () {}
      void operator() (const sesElem& se) const {
          switch (se.second.type) {
          case SES_ADD:
              this->out_ << "Add: " << se.first << endl;
              break;
          case SES_DELETE:
              this->out_ << "Delete: " << se.first << endl;
              break;
          case SES_COMMON:
              this->out_ << "Common: " << se.first << endl;
              break;
          }
      }
  };
  
  #endif // DTL_PRINTERS
  