bool SNC_io_parser<EW>::check_sep(const char* sep) const
{
  char c;
  do in.get(c); while (isspace(c));
  while (*sep != '\0') {
    if (*sep != c) {
      in.putback(c);
      return false;
    }
    ++sep; in.get(c);
  }
  in.putback(c);
  return true;
}
bool SNC_io_parser<EW>::check_sep(const char* sep) const
{
  char c;
  do in.get(c); while (isspace(c));
  while (*sep != '\0') {
    if (*sep != c) {
      in.putback(c);
      return false;
    }
    ++sep; in.get(c);
  }
  in.putback(c);
  return true;
}