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It now seems appropriate to discuss the exact meaning of the signature of a feature. 1 Feature Signature The signature of a feature f is the pair (A,R) where A is the sequence of argument types of a routine or function (empty for entities); R (empty for routines) is the return type for a function, or just the entity type for entities. The following examples make this more clear: Eiffel: An Advanced IntroductionPage 34 Feature variable_attribue (entity) x : INTEGER y : REAL Signature (<>, ) (<>, ) function_without_arguments day_of_year : INTEGER (<>, ) function_with_arguments func(x : INTEGER; r : REAL) : REAL func(a : SOME_CLASS; x : INTEGER) (,) (,CLASS) procedure_with_arguments proc(a : CLASS; r : REAL; x : INTEGER)(,<>) proc(x, y : INTEGER) (, <>) Simply put, the signature of a feature is the sequence of all types of arguments, if any, and the return type (in the case of a function); or just the attribute type in the case of an entity.

It is easier to read old size than go through the motions of determining exactly what original_size means. 3 Invariants Eiffel: An Advanced IntroductionPage 55 As computer scientists, we learn early how to formally specify the behavior of an algorithm. One of these mechanisms is the invariant, or a condition that must always hold true no matter what (actually, the invariant is allowed to be violated at certain critical times, but it must be restored). Eiffel provides the ability to specify a series of invariants.

The assertions include preconditions, post conditions, and invariants. It is also possible to define for a class C that a certain level of assertion monitoring be done, and for another class D, a different or no monitoring be done. This empowers the developer to develop a class with assertion monitoring turned on, and once it has been fully tested and can be guaranteed within a reasonable degree, to work, assertion monitoring may be shut off. 3 The New VEHICLE class Now that we have an understanding of the role of assertions, it is now time to modify our VEHICLE class to support assertions.

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Eiffel.An advanced introduction by Snyder A.A.


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