Pure virtual functions

Lecture Object-Oriented programming - Lesson 29: Abstract class. The main topics covered in this chapter include: implements an abstract concept, cannot be instantiated, used for inheriting interface and/or implementation, concrete concept, abstract classes in C++, pure virtual functions, shape hierarchy,...

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After studying this chapter you will be able to: Describe how objects are returned from methods, describe how the reserved word this is used, define overloaded methods and constructors, define class methods and variables, describe how the arguments are passed to the parameters using the pass-by-value scheme, document classes with javadoc comments, organize classes into a package.

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The topics discussed in this chapter are: Object creation - a detailed analysis, assigning a reference, testing objects for equality, passing references as arguments, method-call chaining, overloaded methods, constructors, overloaded constructors.

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The precursors of object-oriented programming can be traced back to the late 1960's: Classes, inheritance and virtual member functions were integral features of Simula67, a programming language that was mainly used for writing event-driven simulations. When Smalltalk first appeared back in 1972, it offered a pure object-oriented programming environment. In fact, Smalltalk defined object-oriented programming. This style of programming was so innovative and revolutionary at the time that it took more than a decade for it to become a standard in the software industry.

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