diff options
| -rw-r--r-- | src/vehicle.cpp | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/vehicle.cpp b/src/vehicle.cpp index 8673baef1..0fde74128 100644 --- a/src/vehicle.cpp +++ b/src/vehicle.cpp @@ -1321,8 +1321,28 @@ UnitID FreeUnitIDGenerator::NextID() return this->curid; } +/** + * Get an unused unit number for a vehicle (if allowed). + * @param type Type of vehicle + * @return A unused unit number for the given type of vehicle if it is allowed to build one, else \c UINT16_MAX. + */ UnitID GetFreeUnitNumber(VehicleType type) { + /* Check whether it is allowed to build another vehicle. */ + uint max_veh; + switch (type) { + case VEH_TRAIN: max_veh = _settings_game.vehicle.max_trains; break; + case VEH_ROAD: max_veh = _settings_game.vehicle.max_roadveh; break; + case VEH_SHIP: max_veh = _settings_game.vehicle.max_ships; break; + case VEH_AIRCRAFT: max_veh = _settings_game.vehicle.max_aircraft; break; + default: NOT_REACHED(); + } + + uint amounts[4]; + CountCompanyVehicles(_current_company, amounts); + assert((uint)type < lengthof(amounts)); + if (amounts[type] >= max_veh) return UINT16_MAX; // Currently already at the limit, no room to make a new one. + FreeUnitIDGenerator gen(type, _current_company); return gen.NextID(); |