Function GetTownRoadType

src/town_cmd.cpp:965–989

* Get the road type that towns should build at this current moment. * They may have built a different type in the past. */

 * They may have built a different type in the past.
 */
RoadType GetTownRoadType()
{
	RoadType best_rt = ROADTYPE_ROAD;
	const RoadTypeInfo *best = nullptr;
	const uint16_t assume_max_speed = 50;

	for (RoadType rt : GetMaskForRoadTramType(RTT_ROAD)) {
		const RoadTypeInfo *rti = GetRoadTypeInfo(rt);

		/* Can town build this road. */
		if (!rti->flags.Test(RoadTypeFlag::TownBuild)) continue;

		/* Not yet introduced at this date. */
		if (IsInsideMM(rti->introduction_date, 0, CalendarTime::MAX_DATE.base()) && rti->introduction_date > TimerGameCalendar::date) continue;

		if (best != nullptr) {
			if ((rti->max_speed == 0 ? assume_max_speed : rti->max_speed) < (best->max_speed == 0 ? assume_max_speed : best->max_speed)) continue;
		}

		best_rt = rt;
		best = rti;
	}

	return best_rt;
}

/**
 * Get the calendar date of the earliest town-buildable road type.