Function PositionHelper

src/newgrf_engine.cpp:396–413

* Helper to get the position of a vehicle within a chain of vehicles. * @param v the vehicle to get the position of. * @param consecutive whether to look at the whole chain or the vehicles * with the same 'engine type'. * @return the position in the chain from front and tail and chain length. */

 * @return the position in the chain from front and tail and chain length.
 */
static uint32_t PositionHelper(const Vehicle *v, bool consecutive)
{
	const Vehicle *u;
	uint8_t chain_before = 0;
	uint8_t chain_after  = 0;

	for (u = v->First(); u != v; u = u->Next()) {
		chain_before++;
		if (consecutive && u->engine_type != v->engine_type) chain_before = 0;
	}

	while (u->Next() != nullptr && (!consecutive || u->Next()->engine_type == v->engine_type)) {
		chain_after++;
		u = u->Next();
	}

	return chain_before | chain_after << 8 | (chain_before + chain_after + consecutive) << 16;
}

static uint32_t VehicleGetVariable(Vehicle *v, const VehicleScopeResolver *object, uint8_t variable, uint32_t parameter, bool &available)
{