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                          I N R I A - Rocquencourt
                     Salle de réunion du bâtiment 11

                            JEUDI 31 mars, 10h30

                                ------------
                                Andrew Myers
                                ------------

                             Cornell University

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                   Family-level extensibility mechanisms
                   =====================================

Conventional programming language mechanisms for modularity and reuse
have aided development of large systems, but do not scale up to the
size and complexity of the systems we now routinely build.  The
ongoing interest in design patterns and aspect-oriented programming is
evidence of this failing.

In this talk I will describe our work on the J& programming language,
which extends Java with powerful new mechanisms for extensibility,
reuse, and dynamic update.  Programs and objects can cleanly extended
with new functionality and behavior, even at run-time, in a modular,
type-safe way. Unlike conventional object-oriented mechanisms for
extensibility, the family-level mechanisms in J& allow changes that
span many classes and packages, and that change the behavior of
existing objects in a running program.