Copenhagen Programming Language Seminar
Pattern-matching algorithms can support more algorithms, and more polymorphism, than previously realised. Standard approaches consider patterns of the form c p1 ...pn where c is a constructor and p1 ... pn are all patterns. Now the pattern \x \y (lambda x lambda y) can match any compound data structure. For example, equality of data structures can be defined using just two cases, one for atoms and one for compounds. Again, one may consider patterns of the form x \y in which x is a free variable. This can be replaced by a linear function suitable for building patterns. The caclculus now supports higher-order patterns so that patterns may be passed as parameters or returned as results. This may simplify the manipulation of semi-structured data, XML, etc. since whole ontologies could be passed as parameters and then used to create patterns dynamically.
Neil Jones. Administrative host:
Camilla Jensen. All are welcome.
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