CSC/ECE 517 Fall 2011/ch18 6a sc

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Programming by Contract

Common programming errors

Programming by contract

History

The paradigm was first introduced by Bertrand Meyer, the creator of Eiffel programming language. Although Eiffel has implemented assertions as built in programming by contract support, the concepts can be applied in any language. It uses pre-conditions and post-conditions to document or programmatically assert the change in state caused by a piece of a program. Cunningham & Cunningham, Inc., Design by Contract

Benifit

How does it work with inheritance?

Examples

Example 1

Example 2

Example 3

Summary

References

http://en.wikipedia.org/wiki/Design_by_contract
http://www.cs.unc.edu/~stotts/204/contract.html
http://www.cs.usfca.edu/~parrt/course/601/lectures/programming.by.contract.html