/* define the identity element for a microphysical process */
struct NullMicrophysicalProcess {
  unsigned int next_step(const unsigned int t) const {
    return std::numeric_limits<unsigned int>::max();
  }

  bool on_step(const unsigned int t) const { return false; }

  void run_step(const TeamMember &tm, const unsigned int t, view_supers supers,
                State &state, const Monitor auto mo) const {}
};