Function IsEngineRefittable

src/engine.cpp:1287–1308

* Check if an engine is refittable. * Note: Likely you want to use IsArticulatedVehicleRefittable(). * @param engine index of the engine to check. * @return true if the engine is refittable. */

 * @return true if the engine is refittable.
 */
bool IsEngineRefittable(EngineID engine)
{
	const Engine *e = Engine::GetIfValid(engine);

	/* check if it's an engine that is in the engine array */
	if (e == nullptr) return false;

	if (!e->CanCarryCargo()) return false;

	const EngineInfo *ei = &e->info;
	if (ei->refit_mask == 0) return false;

	/* Are there suffixes?
	 * Note: This does not mean the suffixes are actually available for every consist at any time. */
	if (ei->callback_mask.Test(VehicleCallbackMask::CargoSuffix)) return true;

	/* Is there any cargo except the default cargo? */
	CargoType default_cargo = e->GetDefaultCargoType();
	CargoTypes default_cargo_mask = 0;
	SetBit(default_cargo_mask, default_cargo);
	return IsValidCargoType(default_cargo) && ei->refit_mask != default_cargo_mask;
}

/**
 * Check for engines that have an appropriate availability.