💿🐜 Antkeeper source code https://antkeeper.com
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  1. /*
  2. * Copyright (C) 2017-2019 Christopher J. Howard
  3. *
  4. * This file is part of Antkeeper Source Code.
  5. *
  6. * Antkeeper Source Code is free software: you can redistribute it and/or modify
  7. * it under the terms of the GNU General Public License as published by
  8. * the Free Software Foundation, either version 3 of the License, or
  9. * (at your option) any later version.
  10. *
  11. * Antkeeper Source Code is distributed in the hope that it will be useful,
  12. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14. * GNU General Public License for more details.
  15. *
  16. * You should have received a copy of the GNU General Public License
  17. * along with Antkeeper Source Code. If not, see <http://www.gnu.org/licenses/>.
  18. */
  19. #ifndef ENTITY_GROUP_OBSERVER_HPP
  20. #define ENTITY_GROUP_OBSERVER_HPP
  21. #include "entity-group-member.hpp"
  22. /**
  23. * Abstract base class for entity group observers, which are notified each time a member is registered or unregistered from the group.
  24. *
  25. * @tparam T Set of components which are required for group membership.
  26. */
  27. template <typename... T>
  28. class EntityGroupObserver
  29. {
  30. public:
  31. typedef EntityGroupMember<T...> Member;
  32. /**
  33. * Called each time an entity joins the entity group by obtaining the necessary component types.
  34. *
  35. * @param entity Entity ID of the new member.
  36. */
  37. virtual void memberRegistered(const Member* member) = 0;
  38. /**
  39. * Called each time an entity leaves an the entity group by no longer possessing the necessary component types.
  40. *
  41. * @param entity Entity ID of the former member.
  42. */
  43. virtual void memberUnregistered(const Member* member) = 0;
  44. };
  45. #endif // ENTITY_GROUP_OBSERVER_HPP