(svn r12440) -Fix [FS#1694]: Make the road building and road removing conditions more union

-Feature: Allow to build/remove more road-piece combinations directly

src/road_map.h

@@ -65,6 +65,20 @@ static inline RoadBits GetRoadBits(TileIndex t, RoadType rt)
 	}
 }
 
+/**
+ * Get all RoadBits set on a tile except from the given RoadType
+ *
+ * @param t The tile from which we want to get the RoadBits
+ * @param rt The RoadType which we exclude from the querry
+ * @return all set RoadBits of the tile which are not from the given RoadType
+ */
+static inline RoadBits GetOtherRoadBits(TileIndex t, RoadType rt)
+{
+	return ((rt == ROADTYPE_ROAD) ? ROAD_NONE : GetRoadBits(t, ROADTYPE_ROAD)) |
+		((rt == ROADTYPE_TRAM) ? ROAD_NONE : GetRoadBits(t, ROADTYPE_TRAM)) |
+		((rt == ROADTYPE_HWAY) ? ROAD_NONE : GetRoadBits(t, ROADTYPE_HWAY));
+}
+
 /**
  * Get all set RoadBits on the given tile
  *