Object-Oriented Programming in the Beta Programming Language by Ole Lehrmann Madsen, Birger Moller-Pedersen, Kristen Nygaard

By Ole Lehrmann Madsen, Birger Moller-Pedersen, Kristen Nygaard

Object-oriented programming originated with the Simula language built by way of Kristen Nygaard in Oslo within the Sixties. Now, from the birthplace of OOP, comes the hot BETA programming language, for which this e-book is either instructional and reference. It offers a transparent advent to the fundamental ideas of OOP and to extra complex issues.

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Rectangle is called the qualification or the qualifying pattern of R1. attribute The qualification of a reference determines which attributes may be denoted by remote access. LowerRight Since R1 is qualified by Rectangle, R1 cannot be assigned a reference to an instance of the Point pattern. Also, it is not possible to refer to non-existing attributes. Illegal assignments and access of non-existing attributes give rise to many errors in languages without qualified references. In a typed language like BETA, such errors may be detected by the compiler.

The concept of an animal may be viewed as more general than the concepts of mammal, fish, bird and reptile, since all mammals, fishes, birds and reptiles are also animals. The concept animal is said to be a generalization of mammal, fish, bird and reptile. Similarly, mammal is a more general concept than predator and rodent, so mammal is a generalization of rodent and predator. A concept like mammal is also said to be a specialization of animal. Similarly, predator is a specialization of mammal.

The possible kinds of attributes are further described below. ✁ In is a description of the enter-part of the object. The enter-part is a list of input parameters which may be entered prior to execution of the object. ✁ Imp is the do-part of the object. The do-part is an imperative that describes the actions to be performed when the object is executed. An object may, for instance, be executed as a procedure, a coroutine, or as a concurrent process. In Chapters 13–15, the use of objects as coroutines and concurrent processes is described.

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