code: public List<CrowdAgent> getActiveAgents() {
          List<CrowdAgent> agents = new ArrayList<>(m_maxAgents);
          for (int i = 0; i < m_maxAgents; ++i) {
              if (m_agents[i].active) {
                  agents.add(m_agents[i]);
              }
          }
          return agents;
      }
docs: / @return The number of agents returned in @p agents.