By Pascal Poizat, Christine Choppy, Jean-Claude Royer (auth.), Jeannette M. Wing, Jim Woodcock, Jim Davies (eds.)
Formal equipment are coming of age. Mathematical thoughts and instruments at the moment are considered as an immense a part of the improvement approach in a variety of business and governmental firms. A move of know-how into the mainstream of platforms improvement is slowly, yet absolutely, happening. FM’99, the 1st international Congress on Formal tools within the improvement of Computing platforms, is a consequence, and a degree, of this new-found adulthood. It brings a powerful array of business and applications-oriented papers that express how formal equipment were used to take on genuine difficulties. those lawsuits are a checklist of the technical symposium ofFM’99:alo- aspect the papers describingapplicationsofformalmethods,youwill ndtechnical reports,papers,andabstracts detailing new advances in formaltechniques,from mathematical foundations to functional instruments. the area Congress is the successor to the 4 Formal tools Europe Symposia, which in flip succeeded the 4 VDM Europe Symposia. This s- cession re?ects an expanding openness in the overseas neighborhood of researchers and practitioners: papers have been submitted masking a large choice of formal tools and alertness parts. The programmecommittee re?ects the Congress’s foreign nature, with a club of eighty four major researchersfrom 38 di erent countries.The comm- tee was once divided into 19 tracks, every one with its personal chair to supervise the reviewing method. Our collective activity was once a di cult one: there have been 259 top quality s- missions from 35 di erent countries.
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Extra info for FM’99 — Formal Methods: World Congress on Formal Methods in the Development of Computing Systems Toulouse, France, September 20–24, 1999 Proceedings, Volume II
Another way to solve this problem is to introduce a kind of inheritance or subsort (OBJ subsort) in the method. This problem is known to be difficult in itself and rather complex with concurrent systems. Formal Class Design: The Model. This model  defines the notion of formal class as an abstraction of a concrete class in languages like C++, Eiffel, Java or Smalltalk. A formal class is an algebraic specification (as abstract data type) with an object-orientation. This general model is functional and unifies the major concepts of object-oriented programming.
Classes can also be implemented in λObj: in a simplified view, a class A has a method new which first creates an instance b of the superclass B of A and then adds (or updates) this instance with all the fields/methods declared in A. In , an imperative version of λObj featuring an encapsulation mechanism obtained via abstract data types, was introduced. 1), was introduced together with a more powerful type system. 2 Explicit Substitution Calculi and Addresses Explicit Substitution Calculi (see for instance [2, 15]) were invented in order to give a finer description of operational semantics of the functional programming languages.
Although people feel that object-calculi have only little sense in functional setting, we will show in this paper that they are worth studying and that it may be possible to include an object calculus in a pure functional language, like Haskell , with much of the interesting features of objects. Delegation-based Inheritance. The main notion is this of object since there are no classes. Some objects are taken as prototypical in order to build other objects. An “update” operation (indicated in the example as :=) can either override or extend an object with some fields or methods.
FM’99 — Formal Methods: World Congress on Formal Methods in the Development of Computing Systems Toulouse, France, September 20–24, 1999 Proceedings, Volume II by Pascal Poizat, Christine Choppy, Jean-Claude Royer (auth.), Jeannette M. Wing, Jim Woodcock, Jim Davies (eds.)