Method CanLeaveWithCargo

src/order_cmd.cpp:2200–2205

* A vehicle can leave the current station with cargo if: * 1. it can load cargo here OR * 2a. it could leave the last station with cargo AND * 2b. it doesn't have to unload all cargo here. */

 * 2b. it doesn't have to unload all cargo here.
 */
bool Order::CanLeaveWithCargo(bool has_cargo) const
{
	return this->GetLoadType() != OrderLoadType::NoLoad || (has_cargo &&
			this->GetUnloadType() != OrderUnloadType::Unload &&
			this->GetUnloadType() != OrderUnloadType::Transfer);
}