Function GetRoadTypeByLabel

src/road.cpp:265–280

* Get the road type for a given label. * @param label the roadtype label. * @param allow_alternate_labels Search in the alternate label lists as well. * @return the roadtype. */

 * @return the roadtype.
 */
RoadType GetRoadTypeByLabel(RoadTypeLabel label, bool allow_alternate_labels)
{
	extern RoadTypeInfo _roadtypes[ROADTYPE_END];
	if (label == 0) return INVALID_ROADTYPE;

	auto it = std::ranges::find(_roadtypes, label, &RoadTypeInfo::label);
	if (it == std::end(_roadtypes) && allow_alternate_labels) {
		/* Test if any road type defines the label as an alternate. */
		it = std::ranges::find_if(_roadtypes, [label](const RoadTypeInfo &rti) { return rti.alternate_labels.contains(label); });
	}

	if (it != std::end(_roadtypes)) return it->Index();

	/* No matching label was found, so it is invalid */
	return INVALID_ROADTYPE;
}