Function CanBuildVehicleInfrastructure

src/vehicle.cpp:1903–1941

* Check whether we can build infrastructure for the given * vehicle type. This to disable building stations etc. when * you are not allowed/able to have the vehicle type yet. * @param type the vehicle type to check this for * @return true if there is any reason why you may build * the infrastructure for the given vehicle type */

 *         the infrastructure for the given vehicle type
 */
bool CanBuildVehicleInfrastructure(VehicleType type, uint8_t subtype)
{
	assert(IsCompanyBuildableVehicleType(type));

	if (!Company::IsValidID(_local_company)) return false;

	UnitID max;
	switch (type) {
		case VEH_TRAIN:
			if (!HasAnyRailTypesAvail(_local_company)) return false;
			max = _settings_game.vehicle.max_trains;
			break;
		case VEH_ROAD:
			if (!HasAnyRoadTypesAvail(_local_company, (RoadTramType)subtype)) return false;
			max = _settings_game.vehicle.max_roadveh;
			break;
		case VEH_SHIP:     max = _settings_game.vehicle.max_ships; break;
		case VEH_AIRCRAFT: max = _settings_game.vehicle.max_aircraft; break;
		default: NOT_REACHED();
	}

	/* We can build vehicle infrastructure when we may build the vehicle type */
	if (max > 0) {
		/* Can we actually build the vehicle type? */
		for (const Engine *e : Engine::IterateType(type)) {
			if (type == VEH_ROAD && GetRoadTramType(e->VehInfo<RoadVehicleInfo>().roadtype) != (RoadTramType)subtype) continue;
			if (e->company_avail.Test(_local_company)) return true;
		}
		return false;
	}

	/* We should be able to build infrastructure when we have the actual vehicle type */
	for (const Vehicle *v : Vehicle::Iterate()) {
		if (v->type == VEH_ROAD && GetRoadTramType(RoadVehicle::From(v)->roadtype) != (RoadTramType)subtype) continue;
		if (v->owner == _local_company && v->type == type) return true;
	}

	return false;
}


/**