Towards an open finite domain constraint solver
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We describe the design and implementation of a finite domain constraint solver embedded in SICStus Prolog system using an extended unification mechanism via attributed variables as a generic constraint interface. The solver is based on indexicals, i.e. reactive functional rules performing incremental constraint solving or entailment checking. Propagation is done using the arc-consistency algorithm AC-3, adapted for non-binary constraints. At the heart of the algorithm is an evaluator for indexicals.
The solver provides the usual predefined search strategies (fixed order, failfirst principle, branch and bound for minimization or maximization). Access predicates for the relevant variable attributes (domain value, bounds and size etc.) are also provided, making customized search strategies easily programmable.
A design goal has been to keep the solver open-ended and extendible as well as to keep a substantial part written in Prolog, partly contradicting conventional wisdom in implementing constraint solvers.
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- Towards an open finite domain constraint solver
- Book Title
- Principles and Practice of Constraint Programming — CP96
- Book Subtitle
- Second International Conference, CP96 Cambridge, MA, USA, August 19–22, 1996 Proceedings
- pp 531-532
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- Lecture Notes in Computer Science
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- Springer Berlin Heidelberg
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- Author Affiliations
- 1. Computing Science Dept., Uppsala University, PO Box 311, S-751 05, Uppsala, Sweden
- 2. SICS, PO Box 1263, S-164 28, Kista, Sweden
- 3. Xerox PARC, 3333 Coyote Hill Road, 94304-9960, Palo Alto, CA
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