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DOI: 10.4230/LIPIcs.ECOOP.2018.13

Dependent Types for Class-based Mutable Objects

Authors: Joana Campos and Vasco T. Vasconcelos

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

Abstract

We present an imperative object-oriented language featuring a dependent type system designed to support class-based programming and inheritance. Programmers implement classes in the usual imperative style, and may take advantage of a richer dependent type system to express class invariants and restrictions on how objects are allowed to change and be used as arguments to methods. By way of example, we implement insertion and deletion for binary search trees in an imperative style, and come up with types that ensure the binary search tree invariant. This is the first dependently-typed language with mutable objects that we know of to bring classes and index refinements into play, enabling types (classes) to be refined by indices drawn from some constraint domain. We give a declarative type system that supports objects whose types may change, despite being sound. We also give an algorithmic type system that provides a precise account of quantifier instantiation in a bidirectional style, and from which it is straightforward to read off an implementation. Moreover, all the examples in the paper have been run, compiled and executed in a fully functional prototype that includes a plugin for the Eclipse IDE.

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Joana Campos and Vasco T. Vasconcelos. Dependent Types for Class-based Mutable Objects. In 32nd European Conference on Object-Oriented Programming (ECOOP 2018). Leibniz International Proceedings in Informatics (LIPIcs), Volume 109, pp. 13:1-13:28, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@InProceedings{campos_et_al:LIPIcs.ECOOP.2018.13,
  author =	{Campos, Joana and Vasconcelos, Vasco T.},
  title =	{{Dependent Types for Class-based Mutable Objects}},
  booktitle =	{32nd European Conference on Object-Oriented Programming (ECOOP 2018)},
  pages =	{13:1--13:28},
  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.2018.13},
  URN =		{urn:nbn:de:0030-drops-92182},
  doi =		{10.4230/LIPIcs.ECOOP.2018.13},
  annote =	{Keywords: dependent types, index refinements, mutable objects, type systems}
}

Document

DOI: 10.4230/DARTS.4.3.1

Dependent Types for Class-based Mutable Objects (Artifact)

Authors: Joana Campos and Vasco T. Vasconcelos

Published in: DARTS, Volume 4, Issue 3, Special Issue of the 32nd European Conference on Object-Oriented Programming (ECOOP 2018)

Abstract

This artifact is based on DOL, a Dependent Object-oriented Language featuring dependent types, mutable objects and class-based inheritance with subtyping. The typechecker written in Xtend, a flexible and expressive dialect of Java, is a direct implementation of the algorithmic type system described in the companion paper. It uses a direct interface to Z3 theorem prover via its API for Java. The artifact ships with an IDE developed as an Eclipse plugin based on the Xtext framework.

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Joana Campos and Vasco T. Vasconcelos. Dependent Types for Class-based Mutable Objects (Artifact). In Special Issue of the 32nd European Conference on Object-Oriented Programming (ECOOP 2018). Dagstuhl Artifacts Series (DARTS), Volume 4, Issue 3, pp. 1:1-1:2, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2018)

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@Article{campos_et_al:DARTS.4.3.1,
  author =	{Campos, Joana and Vasconcelos, Vasco T.},
  title =	{{Dependent Types for Class-based Mutable Objects (Artifact)}},
  pages =	{1:1--1:2},
  journal =	{Dagstuhl Artifacts Series},
  ISSN =	{2509-8195},
  year =	{2018},
  volume =	{4},
  number =	{3},
  editor =	{Campos, Joana and Vasconcelos, Vasco T.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DARTS.4.3.1},
  URN =		{urn:nbn:de:0030-drops-92337},
  doi =		{10.4230/DARTS.4.3.1},
  annote =	{Keywords: dependent types, index refinements, mutable objects, type systems}
}

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Dependent Types for Class-based Mutable Objects

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Dependent Types for Class-based Mutable Objects (Artifact)

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