SNC_io_parser<EW>::SNC_io_parser(std::istream& is, SNC_structure& W) :
  Base(W), in(is), out(std::cout) {
  W.clear();
  CGAL_assertion(W.is_empty());
  verbose = false;
}
SNC_io_parser<EW>::SNC_io_parser(std::istream& is, SNC_structure& W) :
  Base(W), in(is), out(std::cout) {
  W.clear();
  CGAL_assertion(W.is_empty());
  verbose = false;
}