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Theory and Practice of Logic Programming (1)

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O(1) reversible tree navigation without cycles
RICHARD A. O'KEEFE
Journal:

Theory and Practice of Logic Programming / Volume 1 / Issue 5 / September 2001

Published online by Cambridge University Press:

18 October 2001, pp. 617-630
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Imperative programmers often use cyclically linked trees in order to achieve O(1) navigation time to neighbours. Some logic programmers believe that cyclic terms are necessary to achieve the same in logic-based languages. An old but little-known technique provides O(1) time and space navigation without cyclic links, in the form of reversible predicates. A small modification provides O(1) amortised time and space editing.