Skala University of West Bohemia

The use of various forms of contracts, like preconditions, are increasingly receiving more attention within Microsoft. This talk describes the design of Spec#, an experimental superset of the language C#, including preand postconditions and object invariants. Spec# gives rise to dynamic checks of contracts. The contracts can also be checked statically using the automatic checker Boogie. The talk also reports on some initial experience and describes some difficult issues in the design. Language interoperability at work: Eiffel on .NET Bertrand Meyer, ETH Zurich, Switzerland Abstract Eiffel on .NET takes advantage of the language interoperability mechanisms specified by the Common Language Interface to provide the full power of the Eiffel method and language, including Design by Contract, multiple inheritance, genericity and seamless support for analysis and design, while ensuring full compatibility with components and applications rewritten in other CLS-compliant languages. The talk will present the issues that were faced during the implementation of Eiffel for .NET and the technical solutions retained; it will discuss the benefits of multi-language programming and provide a number of application examples.Eiffel on .NET takes advantage of the language interoperability mechanisms specified by the Common Language Interface to provide the full power of the Eiffel method and language, including Design by Contract, multiple inheritance, genericity and seamless support for analysis and design, while ensuring full compatibility with components and applications rewritten in other CLS-compliant languages. The talk will present the issues that were faced during the implementation of Eiffel for .NET and the technical solutions retained; it will discuss the benefits of multi-language programming and provide a number of application examples.