Conclusions

The library sim extends C++, so that the resulting language exhibits the same functionality as a widely used language as simula. Sim provides a convenient, yet flexible way to write simulation programs in C++. It offers in addition the advantages of C++ :

• efficiency - C++ compilers generate efficient code.
• features - C++ provides advanced object-oriented features. These features affect the structure of a program in a positive way.
• generality - C++ is known and used in other areas as simulation.
• the means to capture complexity - we wrote for example a distributed interactive simulation using the library.

The report and reset methods, the analysis class and the graph ical features are original and are extensively used.

Acknowledgements

We would like to thank the students and staff of the Free University for their comments on the draft of this paper.