Functional and Logic Programming: 9th International by Torsten Schaub (auth.), Jacques Garrigue, Manuel V.

By Torsten Schaub (auth.), Jacques Garrigue, Manuel V. Hermenegildo (eds.)

This e-book constitutes the refereed lawsuits of the ninth overseas Symposium on practical and common sense Programming, FLOPS 2008, held in Ise, Japan, in April 2008.

The 20 revised complete papers offered including three invited contributions have been rigorously reviewed and chosen from fifty nine submissions. The papers are geared up in topical sections on constraints, optimistic mathematics, based varieties, rewriting, software transformation, good judgment and lambda-calculus, forms, and debugging.

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Extra resources for Functional and Logic Programming: 9th International Symposium, FLOPS 2008, Ise, Japan, April 14-16, 2008. Proceedings

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Suppose we would like to schedule an action a such that it occurs either between 3am and 5am or between 7am and 8am. To represent this restriction, we would require a constraint of the form, if action ‘a’ occurs at step S and step S occurs at time T , then T cannot be outside intervals [3-5] or [7-8]. We cannot represent this directly in AC 0 . Instead we introduce two r-atoms int1 and int2 to represent intervals [3-5] and [7-8] respectively. The r-atom int1 denotes that action a occurs in interval [3-5].

For rules with a dynamic priority, this is obviously not always the case. Example 5. Consider the rule X+Y :: r @ a(X,Z) \ b(Y,Z), c(X,Y) <=> d(X). 2 3 The Schedule transition corresponds to the Activate transition in ωr . We use the notation c#i @ {p1 , . . , pn } to denote {c#i @ p1 , . . , c#i @ pn }. 38 L. J. J. Duck In this rule the c/2 constraint with ground arguments X and Y knows the priority of the rule, but neither the a/2 nor the b/2 constraints do. Given the a/2 constraint, we need to combine (join) it with either the b/2 or c/2 constraint to determine the actual priority.

We have already shown how this affects the leq benchmark. Similarly, it also affects the sudoku benchmark which has (amongst others) 11% more rule firings, hence the increase in runtime. Moreover, late indexing only reduces the amount of index insertions by 3% in this benchmark. Leuven CHR system under the ωr semantics. For leq, loop and union-find, we execute the same code ignoring priorities (though sometimes relying on rule order). Leuven CHR code encodes equivalent behavior obtained using priorities by other methods.

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