Traversal in an RTBST is unusual due to its asymmetry. Moving from smaller nodes to larger nodes is easy: we do it with the same algorithm used in a TBST. Moving the other way is more difficult and inefficient besides: we have neither a stack of parent nodes to fall back on nor left threads to short-circuit.
RTBSTs use the same traversal structure as TBSTs, so we can reuse some of the functions from TBST traversers. We also get a few directly from the implementations for BSTs. Other than that, everything has to be written anew here:
397. <RTBST traversal functions 397> = <TBST traverser null initializer; tbst => rtbst 271> <RTBST traverser first initializer 398> <RTBST traverser last initializer 399> <RTBST traverser search initializer 400> <TBST traverser insertion initializer; tbst => rtbst 275> <TBST traverser copy initializer; tbst => rtbst 276> <RTBST traverser advance function 401> <RTBST traverser back up function 402> <BST traverser current item function; bst => rtbst 75> <BST traverser replacement function; bst => rtbst 76>
This code is included in 377, 420, and 457.