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Aug 4th, 2021
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  1.     /**
  2.      * Get the number of vehicles in a given group.
  3.      * @param group_id The group to get the number of engines in.
  4.      * @param vehicle_type The type of vehicle of the group.
  5.      * @pre IsValidGroup(group_id) || group_id == GROUP_ALL || group_id == GROUP_DEFAULT.
  6.      * @pre IsValidGroup(group_id) || vehicle_type == ScriptVehicle::VT_ROAD || vehicle_type == ScriptVehicle::VT_RAIL ||
  7.      *   vehicle_type == ScriptVehicle::VT_WATER || vehicle_type == ScriptVehicle::VT_AIR
  8.      * @return The number of vehicles in the group with id group_id.
  9.      * @note If the group is valid (neither GROUP_ALL nor GROUP_DEFAULT), the value of
  10.      *  vehicle_type is retrieved from the group itself and not from the input value.
  11.      *  But if the group is invalid, either GROUP_ALL or GROUP_DEFAULT, then a
  12.      *  vehicle type must be specified.
  13.      */
  14.     static int32 GetNumVehicles(GroupID group_id, ScriptVehicle::VehicleType vehicle_type);
  15.  
  16. /* static */ int32 ScriptGroup::GetNumVehicles(GroupID group_id, ScriptVehicle::VehicleType vehicle_type)
  17. {
  18.     bool valid_group = IsValidGroup(group_id);
  19.     if (!valid_group && group_id != GROUP_DEFAULT && group_id != GROUP_ALL) return -1;
  20.     if (!valid_group && (vehicle_type < ScriptVehicle::VT_RAIL || vehicle_type > ScriptVehicle::VT_AIR)) return -1;
  21.  
  22.     return GetGroupNumVehicle(ScriptObject::GetCompany(), group_id, valid_group ? ::Group::Get(group_id)->vehicle_type : (::VehicleType)vehicle_type);
  23. }
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