Abstract Base Class In C

Such a class is called abstract class. An abstract class contains at least one pure virtual function you declare a pure virtual function by using a pure specifier 0 in the declaration of a virtual member function in the class declaration.

Abstract Class In C Example C Abstract Class Tutorial

Syntax for declaring a virtual function.

Abstract base class in c. Pure virtual functions and abstract classes in c. See the following syntax. Now coming to an.

However you can use pointers and references to abstract class types. An abstract class is a class that is designed to be specifically used as a base class. However c allows you to create a special kind of virtual function called a pure virtual function or abstract function that has no body at all.

For example let shape be a base class. See the following example. A class is the abstract if it has at least one pure virtual function.

A pure virtual function in. A class that contains at least one pure virtual function is considered an abstract class. Pure virtual abstract functions and abstract base classes so far all of the virtual functions we have written have a body a definition.

To access abstract class it must be inherited from another class. Sometimes implementation of all function cannot be provided in a base class because we don t know the implementation. You cannot create an object of an abstract class type.

Abstract classes are used to represent general concepts for example shape animal which can be used as base classes for concrete classes for example circle dog. Introduction to abstract class in c an abstract class is a class that is declared with an abstract keyword which is a restricted class hence cannot be used to create objects however they can be subclassed. Abstract classes act as expressions of general concepts from which more specific classes can be derived.

We cannot provide implementation of function draw in shape but we know every derived class must have implementation of draw. An abstract class contains at least one pure virtual function. Abstract class in c example c abstract class tutorial abstract class in c.

You declare a pure virtual function by using a pure specifier 0 in the declaration of a virtual member function in the class declaration. No objects of an abstract class can be created except for base subobjects of a class derived from it and no non static data members of an abstract class can be declared. An abstract class is a class that is designed to be specifically used as a base class.

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