Technical Program
  Invited Speakers
  Technical Papers
  Practitioner Reports
Educators' Symposium
Doctoral Symposium
Student Research Comp.
Turing Lecture
Social Events
Week at a Glance
Final Program (1.5M .pdf)

Find in Program


view, help

"Object-Oriented Encapsulation for Dynamically Typed Languages"
Object-Oriented Programming, Systems, Languages and Applications
Home    Program    Housing & Transportation    Registration    Submissions    Wiki    Maps
  > Technical Program > Technical Papers > Inheritance

 : Tuesday

Object-Oriented Encapsulation for Dynamically Typed Languages

Ballroom A-B
Tuesday, 16:30, 30 minutes


Nathanael Schaerli, University of Bern
Andrew P. Black, OGI School of Science & Engineering, Oregon Health & Science University
Stephane Ducasse, University of Bern

Encapsulation in object-oriented languages has traditionally been based on static type systems. As a consequence, dynamically-typed languages have only limited support for encapsulation. This is surprising, considering that encapsulation is one of the most fundamental and important concepts behind object-oriented programming and that it is essential for writing programs that are maintainable and reliable, and that remain robust as they evolve.

In this paper we describe the problems that are caused by insufficient encapsulation mechanisms and then present object-oriented encapsulation, a simple and uniform approach that solves these problems by bringing state of the art encapsulation features to dynamically typed languages. We provide a detailed discussion of our design rationales and compare them and their consequences to the encapsulation approaches used for statically typed languages. We also describe an implementation of object-oriented encapsulation in Smalltalk. Benchmarks of this implementation show that extensive use of object-oriented encapsulation results in a slowdown of less than 15 percent.