Function split_signature

fem/tensorcoefficient.cpp:306–325

        }

        vector<string> split_signature(string signature)
        {
          signature = sanitize_signature(signature);
          vector<string> parts{};
          stringstream new_part{};
          for (auto item: signature)
            {
              if (item == ',' || item == '-')
                {
                  parts.push_back(new_part.str());
                  new_part = stringstream{};
                }
              else if (item == '>' || item == '\0')
                continue;
              else
                new_part << item;
            }
          parts.push_back(new_part.str());
          return parts;
        }

        string replace_ellipse(const string& signature_part, size_t pos, size_t nnew, const string& new_symbols)
        {