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Commonly Asked Questions about Pure class Abstract Templates

How do you create a pure abstract class in C++?

You create an abstract class by declaring at least one pure virtual member function. Thats a virtual function declared by using the pure specifier ( = 0 ) syntax. Classes derived from the abstract class must implement the pure virtual function or they, too, are abstract classes.

What is the difference between template and abstract class in CPP?

The main difference is that abstract classes (run-time polymorphism) are a run-time mechanism, while templates are a compile-time mechanism. This means that by using abstract classes you can possibly change the behaviour at run-time (e.g, by loading a configuration file at run-time, or by means of plugins).

Can an abstract class have a template?

The Abstract Class declares methods that act as steps of an algorithm, as well as the actual template method which calls these methods in a specific order. The steps may either be declared abstract or have some default implementation. Concrete Classes can override all of the steps, but not the template method itself.

What is a pure abstract class?

A pure Abstract class has only abstract member functions and no data or concrete member functions. In general, a pure abstract class is used to define an interface and is intended to be inherited by concrete classes. Its a way of forcing a contract between the class designer and the users of that class.