By Susan Stepney
ISBN-10: 1447135520
ISBN-13: 9781447135524
ISBN-10: 3540197788
ISBN-13: 9783540197782
This number of papers attracts jointly a number of methods for including ob ject orientation to the Z formal specification language. those papers usually are not a convention lawsuits, yet have a marginally extra complex his tory. This paintings has grown and advanced from a few paintings initially performed within the ZIP venture, lower than the United Kingdom's division of alternate and (DTI) IED initiative. ZIP is a 3 yr undertaking which goals to make using the Z specification language extra frequent. It hopes to accomplish this via generating a customary for Zj constructing a style for Zj development device help for Zj and accomplishing examine into refinement, facts and concurrency in Z. The ZIP equipment paintings contains acting a survey of present Z practitioners (reported in [Barden et al. 1992])j investigating present kinds and strategies of Z usagej and constructing a Z procedure instruction manual (available early in 1993). As a part of this paintings, we performed a comparative examine of the ways that item orientation has been mixed with Z. A precis of that paintings has been released as [Stepney et al. 1992].
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Extra resources for Object Orientation in Z
Example text
For example, suppose that a Rectangle class included the state components height : R+ width: R+ with the usual interpretation. A class Square defined as a subclass of Rectangle does not need to introduce any new state components but a constraint o\"er the height and width values f- height = width which now characterizes a square. initialstates The schemas in the initialstates clause are aimed at defining the initial state of the class using initialization operations. Thus, if a schema in the initialstate clause defines an operation, the possible final states specified are the allowed initial states of the class.
R-Stack[T] maz: N maz ~ 100 items : seq T #items ~ maz INIT ______________________________________________ [items = () Push __________________ ~(items) rPoP-------------------~(items) item? : T item! ) ,..... ) ,..... items' The dass has a constant maz which does not exceed 100. Distinct Stack objects may have different values of maz, each remaining constant throughout the evolution of the particular stack. The state schema has one state variable items denoting a sequence of elements of the generic type T.
Meira and A. L. C. Cavaleanti Class Square Using multiple inheritance, we write superclasses Rhombus, Rectangle and it is done. EndClass Square. The Drawing System associates identifiers to a set of quadrilaterals, Class DrawingSystem with the set of quadrilateral identifiers represented by the type givensets QID and the state being a mapping from QID to Quadrilateral. state sereen: Map(X\ QID, Y\ Quadrilateral) initialstates Init __________________________________________________ Iß( sereen) I sereen' Init In the initial state, the DrawingSystem does not contain any quadrilateral.
Object Orientation in Z by Susan Stepney
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