Example Of Abstract Base Class In C

Such a class is called abstract class.

Example of abstract base class in c. We cannot provide implementation of function draw in shape but we know every derived class must have implementation of draw. The class trackedlandvehicle is another variation of the vehicle class. For example consider a class have four methods.

We cannot create the instance of an abstract class. Before we learn about pure virtual functions be sure to check these tutorials. C abstract class and pure virtual function in this tutorial we will learn about abstract virtual functions and abstract classes with the help of examples.

Before understanding abstract class in c it is essential to know the concepts of virtual functions as it is an integral part of learning the concept of abstract classes in c. Consider the example presented in virtual functions. We can create pointer and reference of base abstract class points to the instance of the child class.

Here in the above example base class is an abstract class with pure virtual function func1 a constructor and a pure virtual destructor the pure virtual function is defined in the derived class hence preventing the derived class from becoming an abstract class. When an abstract base class declares no member variables and declares only pure virtual functions then the class is referred to as an interface. The intent of class account is to provide general functionality but objects of type.

Technically every class with at least 1 member function defines an interface however some languages give interface classes special treatment so the term has fallen into use in c also. In these kind of situations we should use abstract class. Abstract base classes abstract base classes are something very similar to the polygon class in the previous example.

Sometimes implementation of all function cannot be provided in a base class because we don t know the implementation. Abstract class is used in situation when we have partial set of implementation of methods in a class. They are classes that can only be used as base classes and thus are allowed to have virtual member functions without definition known as pure virtual functions.