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6.7.3 WB-2-Relation Operations ¶

Method: least (wb-2-relation)  r ¶

If r is nonempty, returns three values: the key at rank 0 of the domain, the set of values it is mapped to, and true; if empty, returns nil, nil, and false. O(log n).

Method: greatest (wb-2-relation)  r ¶

If r is nonempty, returns three values: the key with the largest rank in the domain, the set of values it is mapped to, and true; if empty, returns nil, nil, and false. O(log n).