External Polymorphism

An Object Structural Pattern for Transparently Extending C++ Concrete Data Types

Chris Cleeland
chris@envision.com
Envision Solutions, St. Louis, MO 63141

Douglas C. Schmidt and Timothy H. Harrison
schmidt@cs.wustl.edu and harrison@cs.wustl.edu
Department of Computer Science
Washington University, St. Louis, Missouri, 63130

• Intent
• Motivation
• Applicability
• Structure and Participants
• Collaborations
• Consequences
• Implementation
• Sample Code
• Known Uses
• Related Patterns
• References
• About this document ...