vehiclelist_func.h

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/*
 * 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/>.
 */
 
#ifndef VEHICLELIST_FUNC_H
#define VEHICLELIST_FUNC_H
 
#include "order_base.h"
#include "vehicle_base.h"
 
template <class VehiclePredicate, class OrderPredicate, class VehicleFunc>
void FindVehiclesWithOrder(VehiclePredicate veh_pred, OrderPredicate ord_pred, VehicleFunc veh_func)
{
  for (const OrderList *orderlist : OrderList::Iterate()) {
 
    /* We assume all vehicles sharing an order list match the condition. */
    Vehicle *v = orderlist->GetFirstSharedVehicle();
    if (!veh_pred(v)) continue;
 
    /* Vehicle is a candidate, search for a matching order. */
    for (const Order *order = orderlist->GetFirstOrder(); order != nullptr; order = order->next) {
 
      if (!ord_pred(order)) continue;
 
      /* An order matches, we can add all shared vehicles to the list. */
      for (; v != nullptr; v = v->NextShared()) {
        veh_func(v);
      }
      break;
    }
  }
}
 
#endif /* VEHICLELIST_FUNC_H */