Malte Langkabel
71d0dad3f2
Eleven methods maintained m_tileOccupancy by hand — place, deconstruct, removeBuilding, placeImmediate, tickDeconstruction, findRotateInPlaceTarget and tryDirectCoupleDeposit all indexed a raw std::map<std::pair<int,int>, BuildingId> directly, so the invariant "occupancy stays in sync with placement" was re-implemented at every call site. They now ask and tell a small owned index instead: occupy / release / isOccupied / findOwner. BuildingGrid is a member of BuildingSystem, not a peer system: it has no per-tick behaviour and nothing outside BuildingSystem touches it. The internal keying stays std::pair<int,int> rather than moving to QPoint. The checksum folds the entries in map iteration order, so the comparator is part of the determinism contract; changing it is a separate decision, not a side effect of this move. Verified with a golden-checksum capture before and after — all four sample ticks identical. Co-Authored-By: Claude <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YHcUerKAZKWNvSKJxYKbnG