By Martín Abadi, Luca Cardelli
Procedural languages are usually good understood and their formal foundations solid within the types of numerous lambda-calculi. For object-oriented languages but the scenario isn't really as simple. during this e-book the authors suggest and advance a special procedure by way of constructing item calculi during which gadgets are taken care of as primitives. utilizing item calculi, the authors may be able to clarify either the semantics of items and their typing principles and reveal how you can advance the entire most vital suggestions of object-oriented programming languages: self, dynamic dispatch, sessions, inheritance, safe and personal equipment, prototyping, subtyping, covariance and contravariance, and procedure specialization. Many researchers and graduate scholars will locate this a big improvement of the underpinnings of object-oriented programming.
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Extra info for A theory of Objects
4 When this illusion fails, confusion may result in both language semantics and programming. m( ... ) for method invocation. Moreover, in all implementations of method lookup, an occurrence of self within a method refers to the object that originally received the invocation of that method. Thus self invariably refers to the object that, according to the embedding interpretation, appears to contain the method. It is interesting to notice that some features that would distinguish between embedding and delegation do not appear in class-based languages.
Delegation. As a first attempt towards a proper definition of reCellImp in delegation style, we define reCellImp' as a child of cell: 4. contents := self. set(n). set(n) is to execute the set method of cell with self bound to the current self. The difference between delegate and embed is that the former obtains the method from the parent at the time of invocation, whereas the latter obtains it earlier, at the time of object creation. 4. The meaning is, however, different: reCellImp' does not contain a copy of the attributes of cell, but instead it contains a parent link.
We write them as independent types, but we could introduce syntax to avoid repeating common components. ObjectType Cell is var contents: Integer; method getO: Integer; method set(n: Integer); end; ObjectType ReCell is var contents: Integer; var backup: Integer; method getO: Integer; method set(n: Integer); method restoreO; end; These types list attributes and their types, but not their implementations. They are suitable to appear in interfaces, and to be implemented separately and in more than one way.
A theory of Objects by Martín Abadi, Luca Cardelli