By Ralf Hinze (auth.), Sven-Bodo Scholz, Olaf Chitil (eds.)
ISBN-10: 3642244513
ISBN-13: 9783642244513
ISBN-10: 3642244521
ISBN-13: 9783642244520
This publication constitutes the completely refereed post-proceedings of the twentieth overseas Workshop on Implementation and purposes of useful Languages, IFL 2008, held in Hatfield, united kingdom, in September 2008. The 15 revised complete papers awarded have been rigorously reviewed and chosen from 31 submissions. subject matters of curiosity hide a variety from novel language designs, theoretical underpinnings, compilation and optimisation innovations for varied architectures, to purposes, programming recommendations and novel tools.
Read Online or Download Implementation and Application of Functional Languages: 20th International Symposium, IFL 2008, Hatfield, UK, September 10-12, 2008. Revised Selected Papers PDF
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Additional info for Implementation and Application of Functional Languages: 20th International Symposium, IFL 2008, Hatfield, UK, September 10-12, 2008. Revised Selected Papers
Example text
The function selfEq checks whether its argument is equivalent to itself using the Boolean equivalence test iff. There are two call-by-value derivations for the goal (selfEq coin): selfEq coin | → selfEq True → iff True True → True | → selfEq False → iff False False → not False → True If we evaluate the same goal with call-by-name, we get two more derivations, both with a result that cannot be obtained with call-by-value: 1 When non-determinism is involved, we use the term operation rather than function.
S0 · t0 ≺ s1 · t0 + s0 · t1 ≺ map ( · t0 ) s + s = { shifting lemma } t + map (s0 · ) t s0 · t 0 ≺ s1 · t 0 + s0 · t 1 ≺ s t + map (s1 · ) t + map (s0 · ) t { x s t = · · · ≺ · · · ≺ x s t + map (s1 ·) t + map (s0 ·) t } ⊂ s0 · t 0 ≺ s1 · t 0 + s0 · t 1 ≺ s = { definition of and + } t + map (s1 · ) t + map (s0 · ) t s0 · t0 ≺ s t + map (s0 · ) t { definition of } = s t An analogous argument shows that completes the proof. satisfies the recursion equation of , which Convolution fusion. We show that s t = pure h convolute ( ) (⊕) s t satisfies x s t = s0 t0 ≺ (s pure t0 ) x s t , the defining equation of convolute ( ) ( ) s t .
The definition of insert uses overlapping rules to insert x either as new head or somewhere in the tail of a non-empty list. Permutation sort demonstrates nicely the semantic effect of call-time choice and the operational effect of laziness which prunes away large parts of the search space by not evaluating unsorted permutations completely. Thus, it is a characteristic example for a search problem expressed in the more intuitive generateand-test style but solved in the more efficient test-of-generate style.
Implementation and Application of Functional Languages: 20th International Symposium, IFL 2008, Hatfield, UK, September 10-12, 2008. Revised Selected Papers by Ralf Hinze (auth.), Sven-Bodo Scholz, Olaf Chitil (eds.)
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