TransferID::subtracted()

libuavcan/include/uavcan/transport/transfer.hpp

@@ -104,6 +104,11 @@ public:
      * Amount of increment() calls to reach rhs value.
      */
     int computeForwardDistance(TransferID rhs) const;
+
+    /**
+     * Difference between two TransferID values with proper wraparound handling.
+     */
+    int subtracted(TransferID rhs) const;
 };