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DOI: 10.4230/LIPIcs.ECOOP.2020.1
Sound Regular Corecursion in coFJ

Authors: Davide Ancona, Pietro Barbieri, Francesco Dagnino, and Elena Zucca

Published in: LIPIcs, Volume 166, 34th European Conference on Object-Oriented Programming (ECOOP 2020)

Abstract
The aim of the paper is to provide solid foundations for a programming paradigm natively supporting the creation and manipulation of cyclic data structures. To this end, we describe coFJ, a Java-like calculus where objects can be infinite and methods are equipped with a codefinition (an alternative body). We provide an abstract semantics of the calculus based on the framework of inference systems with corules. In coFJ with this semantics, FJ recursive methods on finite objects can be extended to infinite objects as well, and behave as desired by the programmer, by specifying a codefinition. We also describe an operational semantics which can be directly implemented in a programming language, and prove the soundness of such semantics with respect to the abstract one.
Cite as

Davide Ancona, Pietro Barbieri, Francesco Dagnino, and Elena Zucca. Sound Regular Corecursion in coFJ. In 34th European Conference on Object-Oriented Programming (ECOOP 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 166, pp. 1:1-1:28, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)

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@InProceedings{ancona_et_al:LIPIcs.ECOOP.2020.1,
  author =	{Ancona, Davide and Barbieri, Pietro and Dagnino, Francesco and Zucca, Elena},
  title =	{{Sound Regular Corecursion in coFJ}},
  booktitle =	{34th European Conference on Object-Oriented Programming (ECOOP 2020)},
  pages =	{1:1--1:28},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-154-2},
  ISSN =	{1868-8969},
  year =	{2020},
  volume =	{166},
  editor =	{Hirschfeld, Robert and Pape, Tobias},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2020.1},
  URN =		{urn:nbn:de:0030-drops-131582},
  doi =		{10.4230/LIPIcs.ECOOP.2020.1},
  annote =	{Keywords: Operational semantics, coinduction, programming paradigms, regular terms}
}
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