An abstract class is a class that is designed to be specifically used as a base 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.

The following is an example of an abstract class:

class AB {
public:
virtual void f() = 0;
};

Function AB::f is a pure virtual function. A function declaration cannot have both a pure specifier and a definition. For example, the compiler will not allow the following:

struct A {
virtual void g() { } = 0;
};

You cannot use an abstract class as a parameter type, a function return type, or the type of an explicit conversion, nor can you declare an object of an abstract class. You can, however, declare pointers and references to an abstract class.

An abstract class is a class that is designed to be specifically used as a base 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.

The following is an example of an abstract class:

class AB {
public:
virtual void f() = 0;
};

Function AB::f is a pure virtual function. A function declaration cannot have both a pure specifier and a definition. For example, the compiler will not allow the following:

struct A {
virtual void g() { } = 0;
};

You cannot use an abstract class as a parameter type, a function return type, or the type of an explicit conversion, nor can you declare an object of an abstract class. You can, however, declare pointers and references to an abstract class.

Abstract is a word used to tell that the class definition or the function definition is incomplete and the class which is going to inherit that class should define that class virtual function.

Hiding the internal implementation details is known as the abstraction

Abstraction is one of the basic concept of Object oriented programming which emphasises on hiding the details & focusing on main part.

abstraction is process in which the
programmer has to focus the required
element of the class.

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