Passing Abstractions as Elementary Bricks forDesign Pattern

Design patterns are becoming increasingly popular as a way to describe solutions to general design problems. However, the implementation of design patterns has received only little attention so far. Traditional object models do not provide explicit support for design patterns. This situation leads to problems: design patterns are lost during the implementation creating a gap between software design and the implementation, and the software engineer has to implement a large number of methods or classes with trivial behavior. In this paper, we present how the interaction rst class entities of the FLO language that represent interaction among object support explicit representation of design patterns at the implementation level. Doing so, this language bridges the gap between the design and the implementation of software and provides signiicant tools for representing and implementing design patterns.