ECOOP 2005 - Object-Oriented Programming: 19th European - download pdf or read online

By Bertrand Meyer (auth.), Andrew P. Black (eds.)

ISBN-10: 354027992X

ISBN-13: 9783540279921

The nineteenth Annual assembly of the eu convention on Object-Oriented Programming—ECOOP 2005—took position over the last week of July in Glasgow, Scotland, united kingdom. This quantity contains the refereed technical papers p- sented on the convention, and invited papers. it truly is conventional to preface a quantity of court cases equivalent to this with a be aware that emphasizes the significance of the convention in its respective ?eld. even if such self-evaluations must always be enthusiastic about a wide grain of salt, ECOOP is undisputedly the pre- inent convention on object-orientation outdoor of the U.S.. In its flip, object-orientationis today’s principaltechnology not just for programming,but additionally for layout, analysisand speci?cation of softwaresystems. for that reason, ECOOP has elevated a long way past its roots in programming to surround all of those components of research—whichis why ECOOP has remained such an engaging convention. yet ECOOP is greater than a fascinating convention. it's the nucleus of a technical and educational neighborhood, a neighborhood whose targets are the construction and dissemination of recent wisdom. likelihood conferences at ECOOP have helped to spawn collaborations that span the limits of our many subdisciplines, compile researchers and practitioners, move cultures, and achieve from one part of the area to the opposite. The ubiquity of quickly digital conversation has made keeping those collaborations more straightforward than we'd have believed attainable just a dozen years in the past. however the function of meetings like ECOOP in setting up collaborations has no longer diminished.

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Extra info for ECOOP 2005 - Object-Oriented Programming: 19th European Conference, Glasgow, UK, July 25-29, 2005. Proceedings

Example text

Y := arr item (j) -- Can also be written as y := arr [j] /12/ T is an attached type. Instruction /11/ will indeed store an attached value into the i-th entry, assuming the array implementation does its job properly. Since the class ARRAY [G] will, as one may expect, give for function item the signature item (i: INTEGER): G and the actual generic parameter for arr is T, instruction /12/ correspondingly expects the call arr item (j) to return a T result, for assignment to y. This should be the case for j = i, but what about other values of j, for which the entry hasn’t been explicitly set by a put yet?

Catcalls clearly go away. The semantics of ? U in the covariant redefinition of an argument x originally of type T is slightly different from the usual one involving possible void values. It really means “from T down to U”. It also requires a particular convention rule for the semantics of a new precondition clause of the form require else x some_U_property (we interpret it as {y: U} x and then y some_U_property). So there is a certain amount of kludginess on the theoretical side. But in practice the technique seems to allow us to keep covariance for expressiveness, while removing the dangers.

In a descendant class, we can redefine r so that it now performs a call of target x. Yet under dynamic binding a client could unwittingly be calling the redefined version! We need a way to specify, as part of the official routine interface, that a formal argument such as x above is, although separate, non-blocking. The solution proposed is: use a detachable type, here ? separate T. With the declaration r (x: ? separate T) -- The rest as above no reservation will occur. With this policy, whether reservation occurs is part of the routine’s specification as documented to client programmers.

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ECOOP 2005 - Object-Oriented Programming: 19th European Conference, Glasgow, UK, July 25-29, 2005. Proceedings by Bertrand Meyer (auth.), Andrew P. Black (eds.)

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