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  1. Proceedings of the 15th International Conference on Modularity (MODULARITY 2016)
  2. The expression problem, trivially!
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Segregating feature interfaces to support software product line maintenance
A type-and-effect system for asynchronous, typed events
Modularity and optimization in synergy
Modular architecture for code and metadata sharing
On structuring holistic fault tolerance
Reasoning tradeoffs in languages with enhanced modularity features
On ordering problems in message passing software
Cooperative decoupled processes: the e-calculus and linearity
Matriona: class nesting with parameterization in Squeak/Smalltalk
Constraints as polymorphic connectors
Unveiling and reasoning about co-change dependencies
Fault tolerance with aspects: a feasibility study
CPL: a core language for cloud computing
The expression problem, trivially!

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The expression problem, trivially!

Content Provider ACM Digital Library
Author Oliveira, Bruno C. d. S. Wang, Yanlin
Abstract This paper presents a novel and simple solution to Wadler’s Expression Problem that works in conventional object-oriented languages. Unlike all existing solutions in Java-like languages, this new solution does not use any kind of generics: it relies only on subtyping. The key to the solution is the use of covariant type refinement of return types (or fields): a simple feature available in many object-oriented languages, but not as widely known or used as it should be. We believe that our results present valuable insights for researchers and programming language designers interested in extensibility. Furthermore our results have immediate applicability as practical design patterns for programmers interested in improving extensibility of their programs. .
Starting Page 37
Ending Page 41
Page Count 5
File Format PDF
ISBN 9781450339957
DOI 10.1145/2889443.2889448
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2016-03-14
Publisher Place New York
Access Restriction Subscribed
Subject Keyword Design patterns Expression problem Extensibility Object-oriented programming Modularity
Content Type Text
Resource Type Article
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