Method to_string_file_format

src/db/db/dbStreamLayers.cc:908–918

}

std::string 
LayerMap::to_string_file_format () const
{ 
  std::vector<unsigned int> layers = get_layers ();
  std::ostringstream os;
  for (std::vector<unsigned int>::const_iterator l = layers.begin (); l != layers.end (); ++l) {
    os << mapping_str (*l);
    os << "\n";
  }
  return os.str ();
}

void
LayerMap::add_expr (const std::string &expr, unsigned int l)