INDEX | CLUSTER | FEATURES | SHORT | FRAMES | NO FRAMES |
-- tells the container if its entries must be unigue
-- delivers a new cursor positioned to the entry closest to and
-- greater than 'x' - the presence of entry 'x' is not essential
-- but if currently there are at all no such entries in the list
-- then Void is delivered
-- delivers a new cursor positioned to the entry closest to and
-- less than 'x' - the presence of entry 'x' is not essential
-- but if currently there are at all no such entries in the list
-- then Void is delivered
INDEX | CLUSTER | FEATURES | SHORT | FRAMES | NO FRAMES |