Pure Abstract Class In C

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Pure abstract class in c. Abstract class and pure virtual function in c abstract class is a class which contains atleast one pure virtual function in it. Pure virtual functions and abstract classes in c. 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.

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. A pure virtual function is declared by assigning 0 in declaration. Such a class is called abstract class. We cannot provide implementation of function draw in shape but we know every derived class must have implementation of draw.

Sometimes implementation of all function cannot be provided in a base class because we dont know the implementation. 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. A class that contains at least one pure virtual function is considered an abstract class. Abstract class in c example c abstract class tutorial abstract class in c.

However you can use pointers and references to abstract class types. Classes inheriting an abstract class must provide definition to the pure virtual function otherwise they will also become abstract class. Abstract classes are used to provide an interface for its sub classes. See the following example.

An abstract class is a class that either defines or inherits at least one function for which the final overrider is pure virtual. You cannot create an object of an abstract class type. See the following example. A class is the abstract if it has at least one pure virtual function.

A pure virtual function or abstract function in c is a virtual function for which we dont have implementation we only declare it. For example let shape be a base class. Classes derived from the abstract class must implement the pure virtual function or they too are abstract classes. So far all of the virtual functions we have written have a body a definition.

We cannot create objects of abstract classes. See the following syntax. A pure virtual function simply acts as a placeholder that is meant to be redefined by derived classes.