/* $Id$ */

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

AILog.Info("1.8 API compatibility in effect.");

AIVehicle._GetUnitNumber <- AIVehicle.GetUnitNumber
AIVehicle.GetUnitNumber <- function(vehicle_id)
{
	local unitnumber = AIVehicle._GetUnitNumber(vehicle_id);
	if (unitnumber == UNITNUMBER_INVALID) return -1;
	return unitnumber;
}