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Evaluation Strategies Functional Logic Programming

Summary: Evaluation Strategies
Functional Logic Programming
Sergio Antoy 1
Computer Science Department, Portland State University
P.O. Box 751, Portland, OR 97207, USA
Recent advances in the foundations and the implementations of functional logic
programming languages originate from far­reaching results on narrowing evaluation
strategies. Narrowing is a computation similar to rewriting which yields substitu­
tions in addition to normal forms. In functional logic programming, the classes of
rewrite systems to which narrowing is applied are, for the most part, subclasses
of the constructor­based, possibly conditional, rewrite systems. Many interesting
narrowing strategies, particularly for the smallest subclasses of the constructor­
based rewrite systems, are generalizations of well­known rewrite strategies. How­
ever, some strategies for larger non­confluents subclasses have been developed just
for functional logic computations. This paper discusses the elements that play a
relevant role in evaluation strategies for functional logic computations, describes
some important classes of rewrite systems that model functional logic programs,
shows examples of the di#erences in expressiveness provided by these classes, and


Source: Antoy, Sergio - Department of Computer Science, Portland State University


Collections: Computer Technologies and Information Sciences