Accession Number:

ADA265548

Title:

A New Definition of the Subtype Relation

Descriptive Note:

Corporate Author:

CARNEGIE-MELLON UNIV PITTSBURGH PA SCHOOL OF COMPUTER SCIENCE

Personal Author(s):

Report Date:

1993-04-01

Pagination or Media Count:

23.0

Abstract:

The use of hierarchy is an important component of object-oriented design. Hierarchy allows the use of type families, in which higher level supertypes capture the behavior that all of their subtypes have in common. For this methodology to be effective, it is necessary to have a clear understanding of how subtypes and supertypes are related. This paper presents a new definition of the subtype relation that ensures that any property proved about supertype objects also holds for subtype objects. It also discusses the ramifications of the definition on the design of type families.

Subject Categories:

  • Linguistics
  • Computer Programming and Software

Distribution Statement:

APPROVED FOR PUBLIC RELEASE