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Pearl

DOI: 10.4230/LIPIcs.ECOOP.2021.21

λ-Based Object-Oriented Programming (Pearl)

Authors: Marco Servetto and Elena Zucca

Published in: LIPIcs, Volume 194, 35th European Conference on Object-Oriented Programming (ECOOP 2021)

Abstract

We show that a minimal subset of Java 8 excluding classes supports a simple and natural programming style, which we call λ-based object-oriented programming. That is, on one hand the programmer can use tuples in place of objects (class instances), and tuples can be desugared to lambdas following their classical encoding in the λ-calculus. On the other hand, lambdas can be equipped with additional behaviour, thanks to the fact that they may implement interfaces with default methods, hence inheritance and dynamic dispatch are still supported. We formally describe the encoding by a translation from FJλ, an FJ variant including lambdas and interfaces with default methods, to FJλ-, a subset of FJλ with no classes (hence no constructors and fields). We provide several examples illustrating this novel programming style.

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Marco Servetto and Elena Zucca. λ-Based Object-Oriented Programming (Pearl). In 35th European Conference on Object-Oriented Programming (ECOOP 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 194, pp. 21:1-21:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{servetto_et_al:LIPIcs.ECOOP.2021.21,
  author =	{Servetto, Marco and Zucca, Elena},
  title =	{{\lambda-Based Object-Oriented Programming}},
  booktitle =	{35th European Conference on Object-Oriented Programming (ECOOP 2021)},
  pages =	{21:1--21:16},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-190-0},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{194},
  editor =	{M{\o}ller, Anders and Sridharan, Manu},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2021.21},
  URN =		{urn:nbn:de:0030-drops-140649},
  doi =		{10.4230/LIPIcs.ECOOP.2021.21},
  annote =	{Keywords: Programming paradigms, Java, lambda-calculus}
}

Document

DOI: 10.4230/LIPIcs.ECOOP.2018.20

FHJ: A Formal Model for Hierarchical Dispatching and Overriding

Authors: Yanlin Wang, Haoyuan Zhang, Bruno C. d. S. Oliveira, and Marco Servetto

Published in: LIPIcs, Volume 109, 32nd European Conference on Object-Oriented Programming (ECOOP 2018)

Abstract

Multiple inheritance is a valuable feature for Object-Oriented Programming. However, it is also tricky to get right, as illustrated by the extensive literature on the topic. A key issue is the ambiguity arising from inheriting multiple parents, which can have conflicting methods. Numerous existing work provides solutions for conflicts which arise from diamond inheritance: i.e. conflicts that arise from implementations sharing a common ancestor. However, most mechanisms are inadequate to deal with unintentional method conflicts: conflicts which arise from two unrelated methods that happen to share the same name and signature. This paper presents a new model called Featherweight Hierarchical Java (FHJ) that deals with unintentional method conflicts. In our new model, which is partly inspired by C++, conflicting methods arising from unrelated methods can coexist in the same class, and hierarchical dispatching supports unambiguous lookups in the presence of such conflicting methods. To avoid ambiguity, hierarchical information is employed in method dispatching, which uses a combination of static and dynamic type information to choose the implementation of a method at run-time. Furthermore, unlike all existing inheritance models, our model supports hierarchical method overriding: that is, methods can be independently overridden along the multiple inheritance hierarchy. We give illustrative examples of our language and features and formalize FHJ as a minimal Featherweight-Java style calculus.

Cite as

Yanlin Wang, Haoyuan Zhang, Bruno C. d. S. Oliveira, and Marco Servetto. FHJ: A Formal Model for Hierarchical Dispatching and Overriding. In 32nd European Conference on Object-Oriented Programming (ECOOP 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 109, pp. 20:1-20:30, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@InProceedings{wang_et_al:LIPIcs.ECOOP.2018.20,
  author =	{Wang, Yanlin and Zhang, Haoyuan and Oliveira, Bruno C. d. S. and Servetto, Marco},
  title =	{{FHJ: A Formal Model for Hierarchical Dispatching and Overriding}},
  booktitle =	{32nd European Conference on Object-Oriented Programming (ECOOP 2018)},
  pages =	{20:1--20:30},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-079-8},
  ISSN =	{1868-8969},
  year =	{2018},
  volume =	{109},
  editor =	{Millstein, Todd},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECOOP.2018.20},
  URN =		{urn:nbn:de:0030-drops-92259},
  doi =		{10.4230/LIPIcs.ECOOP.2018.20},
  annote =	{Keywords: multiple inheritance, hierarchical dispatching, OOP, language design}
}

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Documents authored by Servetto, Marco

λ-Based Object-Oriented Programming (Pearl)

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FHJ: A Formal Model for Hierarchical Dispatching and Overriding

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