(svn r17735) -Codechange: update the cache one inserting/removing CargoPackets from the CargoList via Append/Truncate instead of rebuilding the whole cache. For Append this changes the O(n) cache rebuild into a O(1) cache update. For Truncate no temporary list is needed anymore (based on patch by fonsinchen)

src/cargopacket.h

@@ -169,6 +169,20 @@ private:
 
 	List packets;               ///< The cargo packets in this list
 
+	/**
+	 * Update the cache to reflect adding of this packet.
+	 * Increases count, feeder share and days_in_transit
+	 * @param cp a new packet to be inserted
+	 */
+	void AddToCache(const CargoPacket *cp);
+
+	/**
+	 * Update the cached values to reflect the removal of this packet.
+	 * Decreases count, feeder share and days_in_transit
+	 * @param cp Packet to be removed from cache
+	 */
+	void RemoveFromCache(const CargoPacket *cp);
+
 public:
 	/** The stations, via GoodsEntry, have a CargoList. */
 	friend const struct SaveLoad *GetGoodsDesc();