Function FindJoiningWaypoint

src/station_cmd.cpp:1316–1323

* Find a nearby waypoint that joins this waypoint. * @param existing_waypoint an existing waypoint we build over * @param waypoint_to_join the waypoint to join to * @param adjacent whether adjacent waypoints are allowed * @param ta the area of the newly build waypoint * @param wp 'return' pointer for the found waypoint * @param is_road whether to find a road waypoint * @return command cost

 * @return command cost with the error or 'okay'
 */
CommandCost FindJoiningWaypoint(StationID existing_waypoint, StationID waypoint_to_join, bool adjacent, TileArea ta, Waypoint **wp, bool is_road)
{
	if (is_road) {
		return FindJoiningBaseStation<Waypoint, STR_ERROR_MUST_REMOVE_ROADWAYPOINT_FIRST>(existing_waypoint, waypoint_to_join, adjacent, ta, wp, [](const Waypoint *wp) -> bool { return HasBit(wp->waypoint_flags, WPF_ROAD); });
	} else {
		return FindJoiningBaseStation<Waypoint, STR_ERROR_MUST_REMOVE_RAILWAYPOINT_FIRST>(existing_waypoint, waypoint_to_join, adjacent, ta, wp, [](const Waypoint *wp) -> bool { return !HasBit(wp->waypoint_flags, WPF_ROAD); });
	}
}

/**
 * Clear platform reservation during station building/removing.