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Design by contract (DbC), also known as contract programming, programming by contract and design-by-contract programming, is an approach for designing software. It prescribes that software designers should define formal , precise and verifiable interface specifications for software components , which extend the ordinary definition of abstract ...
Preconditions in object-oriented software development are an essential part of design by contract. Design by contract also includes notions of postcondition and class invariant. The precondition for any routine defines any constraints on object state which are necessary for successful execution. From the program developer's viewpoint, this ...
The concept of Design by Contract, highly influential as a design and programming methodology concept and a language mechanism present in such languages as the Java Modeling Language, Spec#, the UML's Object Constraint Language and Microsoft's Code Contracts. The design of the Eiffel language, applicable to programming as well as design and ...
Assertions in design by contract [ edit ] Assertions can function as a form of documentation: they can describe the state the code expects to find before it runs (its preconditions ), and the state the code expects to result in when it is finished running ( postconditions ); they can also specify invariants of a class .
It has built-in language support for design by contract (DbC), extremely strong typing, explicit concurrency, tasks, synchronous message passing, protected objects, and non-determinism. Ada improves code safety and maintainability by using the compiler to find errors in favor of runtime errors.
The design of the language is closely connected with the Eiffel programming method. Both are based on a set of principles, including design by contract, command–query separation, the uniform-access principle, the single-choice principle, the open–closed principle, and option–operand separation.
Command-query separation is particularly well suited to a design by contract (DbC) methodology, in which the design of a program is expressed as assertions embedded in the source code, describing the state of the program at certain critical times. In DbC, assertions are considered design annotations—not program logic—and as such, their ...
1 Time/Space Contracts. 1 comment. 2 "Fail Hard" 2 comments. 3 Verbosity. 1 comment. 4 Java Comparisons. ... 8 Code example. 1 comment. 9 Relationship with software ...